%0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Pignatelli, I. %A Giuliani, Gaston %A Morlot, C. %A Pardieu, V. %T The 'Star of David' pattern and presence of macrosteps on ruby and sapphire crystals from Aappaluttoq, Greenland %D 2022 %L fdi:010086907 %G ENG %J Journal of Gemmology %@ 1355-4565 %K GROENLAND %M ISI:000927575500014 %N 4 %P 364-375 %R 10.15506/JoG.2022.38.4.364 %U https://www.documentation.ird.fr/hor/fdi:010086907 %> https://www.documentation.ird.fr/intranet/publi/2023-03/010086907.pdf %V 38 %W Horizon (IRD) %X A 'Star of David' appearance is rarely exhibited on gem corundum crystals due to triangular step patterns in opposing orientations on each pinacoidal face. Such samples were recently found at the Aappaluttoq mine in Greenland, and are characterised by eye-visible triangular macrosteps with micrometre- to millimetre-size edges, an uncommon feature on natural corundum crystals. The edge height, as well as the presence of wide terraces and trench-like defects on the crystals, suggest that the macrosteps result from step bunching and faceting(1) processes. The macrosteps likely formed under high-temperature conditions and intense fluid-rock interactions, in a growth medium where impurities and direction of fluid flow played an important role in the step formation. Large macrosteps are also found on corundum crystals from other deposits of both magmatic and metamorphic origin. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Pignatelli, I. %A Giuliani, Gaston %A Morlot, C. %A Salsi, L. %A Martayan, G. %T Colombian emerald oddities : review and formation mechanisms %D 2022 %L fdi:010085607 %G ENG %J Journal of Gemmology %@ 1355-4565 %K COLOMBIE %M ISI:000859290600022 %N 1 %P 26-43 %R 10.15506/JoG.2022.38.1.26 %U https://www.documentation.ird.fr/hor/fdi:010085607 %V 38 %W Horizon (IRD) %X Exceptional mineralogical oddities of gemmological interest have been found in Colombia's emerald deposits. Their particular sedimentary-hydrothermal geological environment is characterised by large fluid circulations and changes in thermodynamic conditions during emerald precipitation. In this context, various etching processes and growth perturbations affected the crystals in both the eastern and western belts of these emerald deposits. In the eastern belt, variations in post-growth etching are responsible for the formation of 'vaso' (cup), 'spongy' and spear-shaped emeralds, and etching associated with near-parallel growth of elongated crystals resulted in fibrous emerald specimens. In addition, rare sceptre emeralds formed by epitaxial lateral overgrowth due to the arrival of a later mineralising pulse in the hydrothermal system. 'Emerald gastropods' are also found in the eastern belt, and formed by the replacement of fossil aragonite by calcite which later dissolved away and was replaced by emerald. In the western emerald belt, hydrothermal fluid circulation sometimes resulted in non-uniform crystal growth, giving rise to horseshoe-shaped meralds characterised by an incomplete hexagonal prismatic habit. An unusual sample of a calcitised trapiche emerald-due to fluid circulation affecting trapiche emerald-bearing black shale-is also described. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Pianatelli, I. %A Giuliani, Gaston %A Morlot, C. %A Catnelineau, M. %A Liu, S. I. %T Flower-shaped trapiche ruby from Mong Hsu, Myanmar : a revised growth mechanism %D 2020 %L fdi:010080591 %G ENG %J Journal of Gemmology %@ 1355-4565 %K MYANMAR ; MONG HSU %M ISI:000597402500012 %N 4 %P 404-415 %R 10.15506/JoG.2020.37.4.404 %U https://www.documentation.ird.fr/hor/fdi:010080591 %> https://www.documentation.ird.fr/intranet/publi/depot/2021-02-08/010080591.pdf %V 37 %W Horizon (IRD) %X Two polished slices of flower-shaped trapiche ruby from Mong Hsu were analysed by X-ray computed tomography and X-ray micro-fluorescence. They are characterised by the presence of a core overgrown by two layers of ruby (with the outer one forming the 'petal' shape), and these three domains were previously attributed by Liu (2015) to a multi-stage growth mechanism. The present research indicates that these specimens show textural sector zoning associated with chemical sector zoning. In agreement with literature data, three different growth sectors are identified: a pinacoidal growth sector (corresponding to the core) and two sets of dipyramidal growth sectors with different inclinations with respect to the c-axis. The core, middle and outer layers are thus growth sectors of the same crystal, and no successive stages are needed to explain their formation. Therefore, the growth model proposed for other trapiche rubies from Myanmar also applies to the formation of these flower-shaped specimens. The distinctive shape of these rubies is due to weathering of the growth sectors and the sector boundaries. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Groat, L. A. %A Fallick, A. E. %A Pignatelli, I. %A Pardieu, V. %T Ruby deposits : a review and geological classification %D 2020 %L fdi:010079476 %G ENG %J Minerals %K ruby deposits ; classification ; typology ; magmatism ; metamorphism ; sedimentary ; metasomatism ; fluids ; stable and radiogenic isotopes ; genetic models ; exploration %M ISI:000557472800001 %N 7 %P art. 597 [83 ] %R 10.3390/min10070597 %U https://www.documentation.ird.fr/hor/fdi:010079476 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-08/010079476.pdf %V 10 %W Horizon (IRD) %X Corundum is not uncommon on Earth but the gem varieties of ruby and sapphire are relatively rare. Gem corundum deposits are classified as primary and secondary deposits. Primary deposits contain corundum either in the rocks where it crystallized or as xenocrysts and xenoliths carried by magmas to the Earth's surface. Classification systems for corundum deposits are based on different mineralogical and geological features. An up-to-date classification scheme for ruby deposits is described in the present paper. Ruby forms in mafic or felsic geological environments, or in metamorphosed carbonate platforms but it is always associated with rocks depleted in silica and enriched in alumina. Two major geological environments are favorable for the presence of ruby: (1) amphibolite to medium pressure granulite facies metamorphic belts and (2) alkaline basaltic volcanism in continental rifting environments. Primary ruby deposits formed from the Archean (2.71 Ga) in Greenland to the Pliocene (5 Ma) in Nepal. Secondary ruby deposits have formed at various times from the erosion of metamorphic belts (since the Precambrian) and alkali basalts (from the Cenozoic to the Quaternary). Primary ruby deposits are subdivided into two types based on their geological environment of formation: (Type I) magmatic-related and (Type II) metamorphic-related. Type I is characterized by two sub-types, specifically Type IA where xenocrysts or xenoliths of gem ruby of metamorphic (sometimes magmatic) origin are hosted by alkali basalts (Madagascar and others), and Type IB corresponding to xenocrysts of ruby in kimberlite (Democratic Republic of Congo). Type II also has two sub-types; metamorphic deposits sensu stricto (Type IIA) that formed in amphibolite to granulite facies environments, and metamorphic-metasomatic deposits (Type IIB) formed via high fluid-rock interaction and metasomatism. Secondary ruby deposits, i.e., placers are termed sedimentary-related (Type III). These placers are hosted in sedimentary rocks (soil, rudite, arenite, and silt) that formed via erosion, gravity effect, mechanical transport, and sedimentation along slopes or basins related to neotectonic motions and deformation. %$ 064 ; 066 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Groat, L. A. %A Giuliani, Gaston %A Stone-Sundberg, J. %A Sun, Z. Y. %A Renfro, N. D. %A Palke, A. C. %T A review of analytical methods used in geographic origin determination of gemstones %D 2019 %L fdi:010078079 %G ENG %J Gems and Gemology %@ 0016-626X %M ISI:000534356500004 %N 4 %P 512-535 %R 10.5741/gems.55.4.512 %U https://www.documentation.ird.fr/hor/fdi:010078079 %> https://www.documentation.ird.fr/intranet/publi/2020/06/010078079.pdf %V 55 %W Horizon (IRD) %X Origin determination is of increasing importance in the gem trade. It is possible because there is a close relationship between the geological environment of formation and the physical and chemical properties of gemstones, such as trace element and isotopic compositions, that can be measured in the laboratory using combinations of increasingly sophisticated instrumentation. Origin conclusions for ruby, sapphire, and emerald make up the bulk of demand for these services, with growing demand for alexandrite, tourmaline, and spinel. However, establishing origin with a high degree of confidence using the capabilities available today is met with varying degrees of success. Geographic origin can be determined with a high level of confidence for materials such as emerald, Paraiba-type tourmaline, alexandrite, and many rubies. For some materials, especially blue sapphire and some rubies, the situation is more difficult. The main problem is that if the geology of two deposits is similar, then the properties of the gemstones they produce will also be similar, to the point where concluding an origin becomes seemingly impossible in some cases. Origin determination currently relies on a combination of traditional gemological observations and advanced analytical instrumentation. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Groat, L. A. %T Geology of corundum and emerald gem deposits : a review %D 2019 %L fdi:010078078 %G ENG %J Gems and Gemology %@ 0016-626X %K MONDE %M ISI:000534356500002 %N 4 %P 464-489 %R 10.5741/gems.55.4.464 %U https://www.documentation.ird.fr/hor/fdi:010078078 %> https://www.documentation.ird.fr/intranet/publi/2020/06/010078078.pdf %V 55 %W Horizon (IRD) %X The great challenge of geographic origin determination is to connect the properties and features of individual gems to the geology of their deposits. Similar geologic environments can produce gems with similar gemological properties, making it difficult to find unique identifiers. Over the last two decades, our knowledge of corundum and emerald deposit formation has improved significantly. The mineral deposits are classically separated into primary and secondary deposits. Primary corundum deposits are subdivided into two types based on their geological environment of formation: (1) magmatic and (2) metamorphic. Magmatic deposits include gem corundum in alkali basalts as in eastern Australia, and sapphire in lamprophyre and syenite as in Montana (United States) and Garba Tula (Kenya), respectively. Metamorphic deposits are divided into two subtypes (1) metamorphic deposits sensu stricto (in marble; mafic and ultramafic rocks, or M-UMR), and (2) metamorphic-metasomatic deposits characterized by high fluid-rock interaction and metasomatism (i.e., plumasite or desilicated pegmatites in M-UMR and marble, skarn deposits, and shear zone-related deposits in different substrata, mainly corundum-bearing Mg-Cr-biotite schist). Examples of the first subtype include the ruby deposits in marble from the Mogok Stone Tract or those in M-UMR from Montepuez (Mozambique) and Aappaluttoq (Greenland). The second subtype concerns the sapphire from Kashmir hosted by plumasites in M-UMR. Secondary corundum deposits (i.e., present-day placers) result from the erosion of primary corundum deposits. Here, corundum is found in the following types of deposits: eluvial (derived by in situ weathering or weathering plus gravitational movement), diluvial (scree or talus), colluvial (deposited at the base of slopes by rainwash, sheetwash, slow continuous downslope creep, or a combination of these processes), and alluvial (deposited by rivers). Today, most sapphires are produced from gem placers related to alkali basalts, as in eastern Australia or southern Vietnam, while placers in metamorphic environments, such as in Sri Lanka (Ratnapura, Elahera) and Madagascar (Ilakaka), produce the highest-quality sapphires. The colluvial Montepuez deposit in Mozambique provides a huge and stable supply of clean and very high-quality rubies. Primary emerald deposits are subdivided into two types based on their geological environment of formation: (1) tectonic-magmatic-related (Type I) and (2) tectonic-metamorphic-related (Type II). Several subtypes are defined and especially Type IA, hosted in M-UMR, which accounts for about 70% of worldwide production (Brazil, Zambia, Russia, and others). It is characterized by the intrusion of pegmatites or quartz veins in M-UMR accompanied by huge hydrothermal fluid circulation and metasomatism with the formation of emerald-bearing desilicated pegmatite (plumasite) and biotite schist. Type IB in sedimentary rocks (China, Canada, Norway, Kazakhstan, and Australia) and Type IC in granitic rocks (Nigeria) are of minor importance. The subtype Type IIA of metamorphic deposits is related to hydrothermal fluid circulation at high temperature, in thrust fault and/or shear zones within M-UMR of volcano-sedimentary series, such as at the Santa Terezinha de Goias deposit in Brazil. The subtype Type IIB is showcased by the Colombian emerald deposits located in the Lower Cretaceous black shales of the Eastern Cordillera Basin. These are related to the circulation of hydrothermal basinal fluids in black shales, at 300-330 degrees C, that dissolved evaporites in (1) thrust and tear faults for the deposits of the western emerald zone (Yacopi, Coscuez, Muzo, Penas Blancas, Cunas, and La Pita mines) and (2) a regional evaporite level intercalated in the black shales or the deposits of the eastern emerald zone (Gachala, Chivor, and Macanal mining district Secondary emerald deposits are unknown because emerald is too fragile to survive erosion and transport in rivers. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Pignatelli, I. %A Giuliani, Gaston %A Morlot, C. %A Long, P. V. %T The texture and chemical composition of trapiche ruby from Khoan Thong, Luc Yen Mining District, Northern Vietnam %D 2019 %L fdi:010077789 %G ENG %J Journal of Gemmology %@ 1355-4565 %K VIET NAM %M ISI:000503237900018 %N 8 %P 726-746 %R 10.15506/JoG.2019.36.8.726 %U https://www.documentation.ird.fr/hor/fdi:010077789 %> https://www.documentation.ird.fr/intranet/publi/2020/01/010077789.pdf %V 36 %W Horizon (IRD) %X The trapiche texture and chemical composition of two rubies from the Khoan Thong placer in northern Vietnam were examined by X-ray computed tomography, scanning electron microscopy and electron microprobe analysis. Their texture is similar to that of some Burmese trapiche rubies, with inclusion-rich sector boundaries intersecting at a small central point and a significant concentration of elongated tube-like voids in growth sectors. The most common inclusions are anorthite and margarite; the latter formed by destabilisation of both ruby and anorthite during retrograde metamorphism. The chemical composition of the samples plots in the field of Vietnamese alluvial and primary marble-hosted deposits, although differences in Fe2O3, TiO2 and Cr2O3 contents may distinguish trapiche rubies from various mining areas in Vietnam. Their composition differs from that of Burmese trapiche rubies by a higher Fe2O3/TiO2 ratio and a lower Cr2O3 content. Vietnamese trapiche rubies formed in the same geological environment as non-trapiche ones, under metamorphic conditions prevailing for the Himalayan orogenesis. In this geological context, localised fluid pressure variations and hydraulic fracturing caused changes in the driving force of crystallisation, favouring the development of the trapiche texture. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Voudouris, P. %A Mavrogonatos, C. %A Graham, I. %A Giuliani, Gaston %A Tarantola, A. %A Melfos, V. %A Karampelas, S. %A Katerinopoulos, A. %A Magganas, A. %T Gemstones of Greece : geology and crystallizing environments %D 2019 %L fdi:010076635 %G ENG %J Minerals %K gemstones ; corundum ; beryl ; jadeitite ; garnet ; quartz varieties ; Greece %K GRECE %M ISI:000482981400033 %N 8 %P art. 461 [29 ] %R 10.3390/min9080461 %U https://www.documentation.ird.fr/hor/fdi:010076635 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-09/010076635.pdf %V 9 %W Horizon (IRD) %X In the Hellenides Orogen, minerals of various gem quality occur in various rock types from mainly four tectono-metamorphic units, the Rhodope, Pelagonian, and the Attico-Cycladic massifs, and the Phyllites-Quartzites unit of Crete Island. In crystalline rocks, gemstones are related to both regional metamorphic-metasomatic processes (e.g., gem corundums, Mn-andalusite, thulite/clinothulite, spessartine, titanite, jadeite), and to the formation of late alpine-type fissures, such as, for example, quartz, albite, adularia and titanite. The Tertiary (and Mesozoic) magmatic-hydrothermal environments provide gem-quality sapphire, beryl, garnet, vesuvianite, epidote, fluorite, and SiO2 varieties. The supergene oxidation zone of the Lavrion deposit hosts gem-quality smithsonite and azurite. Coloration in the studied material is either due to various chromophore trace elements present in the crystal structure, or due to inclusions of other mineral phases. Future modern exploration methods combined with gemological investigations (such as treatment and faceting of selected stones), are necessary in order to obtain a better knowledge of the gemstone potential of Greece for its possible exploitation. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Richard, A. %A Morlot, C. %A Creon, L. %A Beaudoin, N. %A Balistky, V. S. %A Pentelei, S. %A Dyja-Person, V. %A Giuliani, Gaston %A Pignatelli, I. %A Legros, H. %A Sterpenich, J. %A Pironon, J. %T Advances in 3D imaging and volumetric reconstruction of fluid and melt inclusions by high resolution X-ray computed tomography %D 2019 %L fdi:010075552 %G ENG %J Chemical Geology %@ 0009-2541 %K Fluid inclusions ; Melt inclusions ; High resolution X-ray computed tomography ; Volume ; Shape ; Phase %M ISI:000462771500003 %N No Spécial %P 3-14 %R 10.1016/j.chemgeo.2018.06.012 %U https://www.documentation.ird.fr/hor/fdi:010075552 %> https://www.documentation.ird.fr/intranet/publi/2019/04/010075552.pdf %V 508 %W Horizon (IRD) %X Fluid and melt inclusions are tiny pockets of fluid and melt trapped in natural and synthetic minerals. Characterizing the 3D distribution of fluid and melt inclusions within minerals, their shape and the volume fraction of their different phases is crucial for determining the conditions of crystal growth and paleostress analysis. However, their relatively small size (typically 5 to 100 mu m), complex shape, heterogeneous content, the opaque nature of some host minerals and projection bias frequently hamper accurate imaging and volumetric reconstruction using conventional microscopic techniques. High resolution X-ray computed tomography (HRXCT) is a non-destructive method which uses contrasts of X-ray attenuation in a series of contiguous radiographs with different view angles to reconstruct the 3D distribution of areas of different densities within a large variety of materials. In this work, we show the capabilities of HRXCT for: (i) imaging the 3D distribution of aqueous and hydrocarbon-bearing fluid inclusions and silicate melt inclusions in a crystal; (ii) characterizing the shape of fluid and melt inclusions and (iii) reconstructing the total volume and the volume of the different phases (liquid, glass, crystal, vapor) of fluid and melt inclusions. We have used a variety of hand specimens and chips of transparent and opaque minerals (olivine, quartz, feldspar, garnet, emerald, wolframite), that we analyzed using three different HRXCT setups. When a resolution of similar to 1 mu m(3)/voxel is achieved, HRXCT allows identifying > 5 mu m fluid inclusions, and the identification and volumetric reconstruction of the different phases can be carried out with reasonable confidence for relatively large (> 25 mu m) inclusions. Density contrasts are high enough to properly identify: (i) a silicate melt inclusion, and its different phases (glass, vapor and crystals such as clinopyroxene and spinel) in an olivine crystal; (ii) aqueous monophase (liquid) and two-phase (liquid + vapor) fluid inclusions in transparent and opaque minerals (quartz, garnet, emerald, wolframite). In the case of hydrocarbon-bearing fluid inclusions containing a vapor phase and two liquid phases (oil and aqueous solution), the two liquid phases could not be distinguished from each other. Volumetric reconstruction of liquid and vapor phases of aqueous and hydrocarbon-bearing fluid inclusions show compatible results with independent calculations using known pressure, temperature, molar volume and composition (P-T-V-x) conditions of trapping or imaging using confocal laser scanning microscopy respectively. Collectively, our results show that HRXCT is a promising tool for non-destructive characterization of fluid and melt inclusions. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Wang, K. K. %A Graham, I. T. %A Martin, L. %A Voudouris, P. %A Giuliani, Gaston %A Lay, A. %A Harris, S. J. %A Fallick, A. %T Fingerprinting paranesti rubies through oxygen isotopes %D 2019 %L fdi:010075315 %G ENG %J Minerals %@ 2075-163X %K rubies ; corundum ; in-situ oxygen isotopes ; Paranesti Greece ; Nestos ; Shear Zone ; Secondary ion mass spectrometry (SIMS) %K GRECE %M ISI:000460799000025 %N 2 %P art. 91 [14 ] %R 10.3390/min9020091 %U https://www.documentation.ird.fr/hor/fdi:010075315 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-03/010075315.pdf %V 9 %W Horizon (IRD) %X In this study, the oxygen isotope (O-18) composition of pink to red gem-quality rubies from Paranesti, Greece was investigated using in-situ secondary ionization mass spectrometry (SIMS) and laser-fluorination techniques. Paranesti rubies have a narrow range of O-18 values between similar to 0 and +1 parts per thousand and represent one of only a few cases worldwide where O-18 signatures can be used to distinguish them from other localities. SIMS analyses from this study and previous work by the authors suggests that the rubies formed under metamorphic/metasomatic conditions involving deeply penetrating meteoric waters along major crustal structures associated with the Nestos Shear Zone. SIMS analyses also revealed slight variations in O-18 composition for two outcrops located just similar to 500 m apart: PAR-1 with a mean value of 1.0 parts per thousand +/- 0.42 parts per thousand and PAR-5 with a mean value of 0.14 parts per thousand +/- 0.24 parts per thousand. This work adds to the growing use of in-situ methods to determine the origin of gem-quality corundum and re-confirms its usefulness in geographic "fingerprinting". %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Voudouris, P. %A Mavrogonatos, C. %A Graham, I. %A Giuliani, Gaston %A Melfos, V. %A Karampelas, S. %A Karantoni, V. %A Wang, K. %A Tarantola, A. %A Zaw, K. %A Meffre, S. %A Klemme, S. %A Berndt, J. %A Heidrich, S. %A Zaccarini, F. %A Fallick, A. %A Tsortanidis, M. %A Lampridis, A. %T Gem corundum deposits of Greece: geology, mineralogy and genesis %D 2019 %L fdi:010075245 %G ENG %J Minerals %@ 2075-163X %K corundum megacrysts ; ruby ; sapphire ; plumasite ; metamorphic-metasomatic ; origin ; Greece %K GRECE %M ISI:000459736200049 %N 1 %P art. 49 [41 ] %R 10.3390/min9010049 %U https://www.documentation.ird.fr/hor/fdi:010075245 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-03/010075245.pdf %V 9 %W Horizon (IRD) %X Greece contains several gem corundum deposits set within diverse geological settings, mostly within the Rhodope (Xanthi and Drama areas) and Attico-Cycladic (Naxos and Ikaria islands) tectono-metamorphic units. In the Xanthi area, the sapphire (pink, blue to purple) deposits are stratiform, occurring within marble layers alternating with amphibolites. Deep red rubies in the Paranesti-Drama area are restricted to boudinaged lenses of Al-rich metapyroxenites alternating with amphibolites and gneisses. Both occurrences are oriented parallel to the ultra-high pressure/high pressure (UHP/HP) Nestos suture zone. On central Naxos Island, colored sapphires are associated with desilicated granite pegmatites intruding ultramafic lithologies (plumasites), occurring either within the pegmatites themselves or associated metasomatic reaction zones. In contrast, on southern Naxos and Ikaria Islands, blue sapphires occur in extensional fissures within Mesozoic metabauxites hosted in marbles. Mineral inclusions in corundums are in equilibrium and/or postdate corundum crystallization and comprise: spinel and pargasite (Paranesti), spinel, zircon (Xanthi), margarite, zircon, apatite, diaspore, phlogopite and chlorite (Naxos) and chloritoid, ilmenite, hematite, ulvospinel, rutile and zircon (Ikaria). The main chromophore elements within the Greek corundums show a wide range in concentration: the Fe contents vary from (average values) 1099 ppm in the blue sapphires of Xanthi, 424 ppm in the pink sapphires of Xanthi, 2654 ppm for Paranesti rubies, 4326 ppm for the Ikaria sapphires, 3706 for southern Naxos blue sapphires, 4777 for purple and 3301 for pink sapphire from Naxos plumasite, and finally 4677 to 1532 for blue to colorless sapphires from Naxos plumasites, respectively. The Ti concentrations (average values) are very low in rubies from Paranesti (41 ppm), with values of 2871 ppm and 509 in the blue and pink sapphires of Xanthi, respectively, of 1263 ppm for the Ikaria blue sapphires, and 520 ppm, 181 ppm in Naxos purple, pink sapphires, respectively. The blue to colorless sapphires from Naxos plumasites contain 1944 to 264 ppm Ti, respectively. The very high Ti contents of the Xanthi blue sapphires may reflect submicroscopic ruffle inclusions. The Cr (average values) ranges from 4 to 691 ppm in the blue, purple and pink colored corundums from Naxos plumasite, is quite fixed (222 ppm) for Ikaria sapphires, ranges from 90 to 297 ppm in the blue and pink sapphires from Xanthi, reaches 9142 ppm in the corundums of Paranesti, with highest values of 15,347 ppm in deep red colored varieties. Each occurrence has both unique mineral assemblage and trace element chemistry (with variable Fe/Mg, Ga/Mg, Ga/Cr and Fe/Ti ratios). Additionally, oxygen isotope compositions confirm their geological typology, i.e., with, respectively delta O-18 of 4.9 +/- 0.2%o for sapphire in plumasite, 20.5%o for sapphire in marble and 1%0 for ruby in mafics. The fluid inclusions study evidenced water free CO2 dominant fluids with traces of CH4 or N-2, and low CO2 densities (0.46 and 0.67 g/cm(3)), which were probably trapped after the metamorphic peak. The Paranesti, Xanthi and central Naxos corundum deposits can be classified as metamorphic sensu stricto (s.s.) and metasomatic, respectively, those from southern Naxos and Ikaria display atypical magmatic signature indicating a hydrothermal origin. Greek corundums are characterized by wide color variation, homogeneity of the color hues, and transparency, and can be considered as potential gemstones. %$ 064 ; 066 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Groat, L. A. %A Marshall, D. %A Fallick, A. E. %A Branquet, Y. %T Emerald deposits : a review and enhanced classification %D 2019 %L fdi:010075314 %G ENG %J Minerals %@ 2075-163X %K emerald deposits ; classification ; typology ; metamorphism ; magmatism ; sedimentary ; alkaline metasomatism ; fluids ; stable and radiogenic ; isotopes ; genetic models ; exploration %K COLOMBIE ; BRESIL ; ZAMBIE, RUSSIE ; ZIMBABWE ; MADAGASCAR ; PAKISTAN ; AFGHANISTAN ; AFRIQUE DU SUD ; INDE ; AUSTRALIE ; BULGARIE ; CANADA ; CHINE ; RUSSIE ; ESPAGNE ; ETATS UNIS ; MOZAMBIQUE ; TANZANIE ; ETHIOPIE ; SOMALIE ; NIGERIA ; UKRAINE ; AUTRICHE ; NORVEGE ; SUISSE ; ITALIE ; KAZAKHSTAN ; EGYPTE %M ISI:000460799000039 %N 2 %P art. 105 [63 ] %R 10.3390/min9020105 %U https://www.documentation.ird.fr/hor/fdi:010075314 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-03/010075314.pdf %V 9 %W Horizon (IRD) %X Although emerald deposits are relatively rare, they can be formed in several different, but specific geologic settings and the classification systems and models currently used to describe emerald precipitation and predict its occurrence are too restrictive, leading to confusion as to the exact mode of formation for some emerald deposits. Generally speaking, emerald is beryl with sufficient concentrations of the chromophores, chromium and vanadium, to result in green and sometimes bluish green or yellowish green crystals. The limiting factor in the formation of emerald is geological conditions resulting in an environment rich in both beryllium and chromium or vanadium. Historically, emerald deposits have been classified into three broad types. The first and most abundant deposit type, in terms of production, is the desilicated pegmatite related type that formed via the interaction of metasomatic fluids with beryllium-rich pegmatites, or similar granitic bodies, that intruded into chromium- or vanadium-rich rocks, such as ultramafic and volcanic rocks, or shales derived from those rocks. A second deposit type, accounting for most of the emerald of gem quality, is the sedimentary type, which generally involves the interaction, along faults and fractures, of upper level crustal brines rich in Be from evaporite interaction with shales and other Cr- and/or V-bearing sedimentary rocks. The third, and comparatively most rare, deposit type is the metamorphic-metasomatic deposit. In this deposit model, deeper crustal fluids circulate along faults or shear zones and interact with metamorphosed shales, carbonates, and ultramafic rocks, and Be and Cr (+/- V) may either be transported to the deposition site via the fluids or already be present in the host metamorphic rocks intersected by the faults or shear zones. All three emerald deposit models require some level of tectonic activity and often continued tectonic activity can result in the metamorphism of an existing sedimentary or magmatic type deposit. In the extreme, at deeper crustal levels, high-grade metamorphism can result in the partial melting of metamorphic rocks, blurring the distinction between metamorphic and magmatic deposit types. In the present paper, we propose an enhanced classification for emerald deposits based on the geological environment, i.e., magmatic or metamorphic; host-rocks type, i.e., mafic-ultramafic rocks, sedimentary rocks, and granitoids; degree of metamorphism; styles of minerlization, i.e., veins, pods, metasomatites, shear zone; type of fluids and their temperature, pressure, composition. The new classification accounts for multi-stage formation of the deposits and ages of formation, as well as probable remobilization of previous beryllium mineralization, such as pegmatite intrusions in mafic-ultramafic rocks. Such new considerations use the concept of genetic models based on studies employing chemical, geochemical, radiogenic, and stable isotope, and fluid and solid inclusion fingerprints. The emerald occurrences and deposits are classified into two main types: (Type I) Tectonic magmatic-related with sub-types hosted in: (IA) Mafic-ultramafic rocks (Brazil, Zambia, Russia, and others); (IB) Sedimentary rocks (China, Canada, Norway, Kazakhstan, Australia); (IC) Granitic rocks (Nigeria). (Type II) Tectonic metamorphic-related with sub-types hosted in: (IIA) Mafic-ultramafic rocks (Brazil, Austria); (IIB) Sedimentary rocks-black shale (Colombia, Canada, USA); (IIC) Metamorphic rocks (China, Afghanistan, USA); (IID) Metamorphosed and remobilized either type I deposits or hidden granitic intrusion-related (Austria, Egypt, Australia, Pakistan), and some unclassified deposits. %$ 064 ; 066 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Fallick, A. E. %A Giuliani, Gaston %A Rigaudier, T. %A Boyce, A. J. %A Pham, V. L. %A Pardieu, V. %T Remarkably uniform oxygen isotope systematics for co-existing pairs of gem-spinel and calcite in marble, with special reference to Vietnamese deposits %D 2019 %L fdi:010075174 %G ENG %J Comptes Rendus Geoscience %@ 1631-0713 %K Marble deposits ; Asia ; East Africa ; Spinel-calcite pair ; Oxygen isotope ; fractionation ; Temperature of formation %K VIET NAM ; TANZANIE ; NEPAL ; MYANMAR ; TADJIKISTAN ; PAKISTAN ; KENYA %M ISI:000458134400004 %N 1 %P 27-36 %R 10.1016/j.crte.2018.11.008 %U https://www.documentation.ird.fr/hor/fdi:010075174 %> https://www.documentation.ird.fr/intranet/publi/2019/02/010075174.pdf %V 351 %W Horizon (IRD) %X Oxygen isotope systematics for co-existing pairs of gem-spinel and calcite in marble from Vietnam and other worldwide deposits have been determined in order to characterize the O-isotope fractionation between calcite and spinel. In Vietnam, the Delta O-18(cc-sp) (= 3.7 + 0.1 parts per thousand for six samples from the An Phu and Cong Troi deposits) is remarkably constant. The combination of these data with those obtained on calcite-spinel pairs of Paigutan (Nepal, n = 2), Ipanko (Tanzania, n = 1), and Mogok (Myanmar, = 2) are also consistent with an overall Delta O-18(cc-sp) of 3.6 + 0.3 parts per thousand for all the spinel samples (n = 11). The straight line correlation delta O-18(cc) = 0.96 delta O-18(sp) + 4.4 is excellent despite their worldwide geographic spread. The increment method of calculating oxygen isotope fractionation gave a geologically unreasonable temperature of formation for both minerals at 1374 degrees C when compared to temperatures obtained by mineral assemblage equilibrium of these marble type deposits, between 610 and 750 degrees C. The constant Delta O-18(cc-sp) reflects a constant temperature for this amphibolite facies assemblage, whose current best estimate is calculated at 620 + 40 degrees C, but unquantified uncertainties remain. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Jacob, J. B. %A Martelat, J. E. %A Goncalves, P. %A Giuliani, Gaston %A Devidal, J. L. %A Feneyrol, J. %A Omito, E. %A Ichang'I, D. %T New P-T-X conditions for the formation of gem tsavorite garnet in the Voi area (southwestern Kenya) %D 2018 %L fdi:010074794 %G ENG %J Lithos %@ 0024-4937 %K Kenya ; Mozambican belt ; Kurase group ; Tsavorite garnet ; Granulite facies ; metamorphism ; Petrological modelling %K KENYA %M ISI:000453111800019 %P 250-264 %R 10.1016/j.lithos.2018.09.010 %U https://www.documentation.ird.fr/hor/fdi:010074794 %> https://www.documentation.ird.fr/intranet/publi/2018/12/010074794.pdf %V 320 %W Horizon (IRD) %X Tsavorite nodules-bearing deposits from southwestern Kenya are located in the Kurase Group, a metasedimentary unit of the Neoproterozoic Metamorphic Mozambique Belt. This unit is composed of graphitic paragneisses intercalated with metacarbonates and metaevaporites, surrounded by migmatites. The rocks underwent high grade metamorphism at 615-600 Ma. The main goal of this work is to link tsavorite formation to the metamorphic evolution of the Kurase Group. The new thermobarometric data indicate widespread granulite facies conditions at 800 +/- 50 degrees C and 10 +/- 1 kbar, with no significant difference between the tsavorite-bearing metasediments and the surrounding migmatitic gneisses. Pseudosection calculation for a tsavorite-bearing metasediment indicates that tsavorite grew close to peak-T conditions at around 800 degrees C. The tsavoritebearing formations have not melted extensively despite the high-grade metamorphism, in contrast with the surrounding migmatites. The lack of partial melting is probably due to an enrichment in vanadium, chromium and titanium in the protoliths that have increased the stability field of micas toward high-T. We suggest that the primary source of V and Cr was the evaporite-bearing mudstones. Crystallisation of high grade V and Cr rich tsavorite occurred in a closed system with little or no strain, in the presence of molten salts and H2S-S-8 fluids. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Dubessy, J. %A Pignatelli, I. %A Schwarz, D. %T Fluid inclusions study of trapiche and non-trapiche rubies from the Mong Hsu deposit, Myanmar %D 2018 %L fdi:010074801 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K Mong Hsu deposit ; Myanmar ; ruby ; trapiche texture ; fluid inclusions ; microthermometry ; Raman spectrometry ; CO2-H2S-COS-S-8-AlO(OH) system ; texture formation %K MYANMAR %M ISI:000452843000001 %N 5 %P 691-703 %R 10.3749/canmin.1800013 %U https://www.documentation.ird.fr/hor/fdi:010074801 %> https://www.documentation.ird.fr/intranet/publi/2018/12/010074801.pdf %V 56 %W Horizon (IRD) %X The Mong Hsu ruby deposit in Myanmar is a marble-type deposit. It is well-known for attractive crystals with dark violet/ blue to black cores and ruby rims, as well as for trapiche rubies. These exceptional rubies have a texture composed of six growth sectors separated by six dendrites running from a central core to the six corners. Fluid inclusions (FI) have been studied in both types of ruby, i.e., trapiche and non-trapiche crystals. Microthenuometry combined with Raman spectrometry investigations of primary and secondary FI proved the existence of CO2-H2S-COS-S-8-AlO(OH)-bearing fluids with diaspore and native sulfur daughter minerals. The carbonic fluid belongs to the CO2-H2S system with CO2 as a dominant component. Minor COS (1-2 mol.%) and diaspore indicate that H2O (similar to 1 mol.%) was present in the paleofluid. The amount of H2S in FI from trapiche ruby is between 6.9 and 7.4 mol.% for the dendrites and from 7.2 to 15.7 mol.% for the growth sectors. The H2S content is approximately 10 mol.% in FI from non-trapiche rubies. The presence of dawsonite and previous crushing data carried out on well-cleaned crystals of non-trapiche ruby indicate that an ionic salt melt was present at the time of ruby formation. The non-detection of this melt in trapiche ruby is attributed to the small size of the remnants of molten salts, making it difficult to observe them under the microscope. Following this hypothesis, the FI assemblages in rubies would correspond to the trapping of two immiscible fluids. i.e.. a carbonic phase in the CO2-H2S-COS-S-8-AlO(OH)system and molten salts. Such fluid phases are considered to be the product of metamorphism of evaporites during devolatilization of carbonates and thermal-sulfate reduction. The formation of trapiche ruby is discussed in terms of possible variations of the composition of the fluid, temperature, and pressure conditions. The variation in density of the carbonic fluids from the dendrites (0.70 < ds < 0.78) to the growth sectors (0.56 < ds < 0.68) records variation of fluid pressure in the metamorphic system. This variation led to episodically local fluid overpressure and hydraulic fracturing in the marble. During such episodes, changes in driving-force conditions allowed for the formation of the trapiche texture in ruby: the development of dendrites and growth sectors occurred under high and low driving-force conditions, respectively. Non-trapiche ruby in veinlets formed concurrently under thermodynamic conditions similar to those registered for the growth sectors in trapiche ruby. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Dubessy, J. %A Ohnenstetter, D. %A Banks, D. %A Branquet, Y. %A Feneyrol, J. %A Fallick, A. E. %A Martelat, J. E. %T The role of evaporites in the formation of gems during metamorphism of carbonate platforms : a review %D 2018 %L fdi:010071979 %G ENG %J Mineralium Deposita %@ 0026-4598 %K Gems ; Emerald ; Ruby ; Garnet ; Zoisite ; Lapis-lazuli ; Metamorphism ; Carbonate platform ; Evaporites ; Brines ; Fingerprints ; Salinity ; Molten ; salts ; Thermal reduction of sulphates %K COLOMBIE %M ISI:000419353400001 %N 1 %P 1-20 %R 10.1007/s00126-017-0738-4 %U https://www.documentation.ird.fr/hor/fdi:010071979 %> https://www.documentation.ird.fr/intranet/publi/2018/01/010071979.pdf %V 53 %W Horizon (IRD) %X The mineral and fluid inclusions trapped by gemstones during the metamorphism of carbonate platform successions are precious markers for the understanding of gem genesis. The nature and chemical composition of inclusions highlight the major contribution of evaporites through dissolution or fusion, depending on the temperature of formation from greenschist to granulite facies. The fluids are highly saline NaCl-brines circulating either in an open system in the greenschist facies (Colombian and Afghan emeralds) and with huge fluid-rock metasomatic interactions, or sulphurous fluids (ruby, garnet tsavorite, zoisite tanzanite and lapis-lazuli) or molten salts formed in a closed system with a low fluid mobility (ruby in marble) in the conditions of the amphibolite to granulite facies. These chloride-fluoride-sulphate +/- carbonate-rich fluids scavenged the metals essential for gem formation. At high temperature, the anions SO4 (2-), NO3 (-), BO3 (-) and F- are powerful fluxes which lower the temperature of chloride- and fluoride-rich ionic liquids. They provided transport over a very short distance of aluminium and/or silica and transition metals which are necessary for gem growth. In summary, the genetic models proposed for these high-value and ornamental gems underline the importance of the metamorphism of evaporites formed on continental carbonate shelves and emphasise the chemical power accompanying metamorphism at moderate to high temperatures of evaporite-rich and organic matter-rich protoliths to form gem minerals. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Martelat, J. E. %A Paquette, J. L. %A Bosse, V. %A Giuliani, Gaston %A Monie, P. %A Omito, E. %A Simonet, C. %A Ohnenstetter, D. %A IchanG'I, D. %A Nyamai, C. %A Wamunyu, A. %T Chronological constraints on tsavorite mineralizations and related metamorphic episodes in southeast Kenya %D 2017 %L fdi:010071370 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K tsavorite ; zircon and monazite in situ dating ; Ar-Ar dating ; Kenya ; Tsavo ; granulite and amphibolite facies %K KENYA %M ISI:000412799400002 %N 5 %P 845-865 %R 10.3749/canmin.1700019 %U https://www.documentation.ird.fr/hor/fdi:010071370 %> https://www.documentation.ird.fr/intranet/publi/2017/11/010071370.pdf %V 55 %W Horizon (IRD) %X Tsavorite is exclusively hosted in the Neoproterozoic Metamorphic Mozambique Belt (NMMB). The gemstone mines, widespread between Kalalani (Tanzania) and Mgama Ridge (Kenya), define a continuous corridor over a hundred kilometers in length. The tsavorite is hosted by a metasedimentary sequence defined as the Kurase tsavorite-bearing metasediments (KuraseTB metasediments) that also hosts rubies. These metasediments underwent amphibolite-facies metamorphism and are surrounded by granulitic gneisses that are also of sedimentary origin (the Kurase high-temperature gneisses). All these rocks lie below the Kasigau Group, a unit dominated by granulite-facies metamagmatic rocks. To constrain the timing of events that led to this peculiar occurrence of tsavorite, we have performed geochronological analyses of thin sections and of separated grains of zircon, monazite, and rutile using LA-ICP-MS and ID-TIMS, as well as 40 Ar/ 39 Ar of muscovite and phlogopite from various lithologies. The results show that the different terranes were metamorphosed synchronously between 620-580 Ma but under different P-T strain conditions. The Kurase-HT gneisses and the rocks from the Kasigau Group are highly strained and underwent granulite-facies metamorphism with abundant partial melting and emplacement of felsic melts between 620 and 600 Ma. Textural observations also underlined a late regional water flux controlling the occurrence of V-free muscovite and monazite mineralizations at 585 Ma. The latter event can be related to theactivity of the Galana shear zone, in the east. The Kurase-TB metasediments escaped strain and partial melting. They record amphibolite-facies conditions with static heating, since initial sedimentary structures were locally preserved. The age of the tsavorite mineralization was inferred at 600 Ma from metamorphic zircon rims and monazite from the closest host-rocks, sampled in the mines. Hence, tsavorite crystallization occurred statically at the end of the metamorphic event, probably when the temperature and the amount of volatiles were at maximum levels. Conversely, the ruby formed by local metasomatism of felsic dikes and isolated ultramafic bodies. The rubies are older and zircons and monazites from a ruby-bearing felsic dike (plumasite) were dated at 615 Ma. Finally, data from rutile and micas indicate a global cooling below 430 degrees C of the whole region between 510 and 500 Ma. %$ 064 ; 066 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Wang, K. K. %A Graham, I. T. %A Lay, A. %A Harris, S. J. %A Cohen, D. R. %A Voudouris, P. %A Belousova, E. %A Giuliani, Gaston %A Fallick, A. E. %A Greig, A. %T The origin of a new pargasite-schist hosted ruby deposit from Paranesti, Northern Greece %D 2017 %L fdi:010070897 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K Paranesti Greece ; rubies ; pargasite schist ; margarite ; spinel inclusion ; Rhodope ; Nestos Shear Zone ; mafic/ultramafic ; retrogression ; metasomatic ; P-T conditions %K GRECE %M ISI:000406369600003 %N 4 %P 535-560 %R 10.3749/canmin.1700014 %U https://www.documentation.ird.fr/hor/fdi:010070897 %> https://www.documentation.ird.fr/intranet/publi/2017/09/010070897.pdf %V 55 %W Horizon (IRD) %X Gem-quality (cabochon) ruby-bearing occurrences (here termed PAR-1 and PAR-5) located near Paranesti, north eastern Greece have been systematically studied for the first time in this paper. Tectonically, the occurrences are located within the Nestos Shear Zone (NSZ). The NSZ separates two distinct geological units. The Rhodope Terrane is a heterogeneous unit of gneisses, mafic, ultramafic, and meta-sedimentary rocks in the hanging wall. The footwall Pangaion-Pirin Complex consists of marbles and acid gneisses of a Mesozoic carbonate platform on pre-Mesozoic continental basement. In this paper, a range of petrographic and geochemical techniques were used to determine (1) any similarities and differences to other mafic-ultramafic hosted ruby deposits worldwide; (2) distinctive geochemical fingerprints for Paranesti; and (3) the likely P-T conditions of formation. Detailed petrographic and whole-rock analyses utilizing ICP-MS, XRF, and XRD have found the Paranesti corundum to be of a mafic/ultramafic protolith with approximately 40 wt.% SiO2, 16 wt.% Mg, 11000 ppm Cr, and 440 ppm Ni. EMPA major element analysis determined the mineral inclusions within the corundum grains to be picotite and hercynite spinels. Pargasite is the dominant amphibole within the corundum-bearing amphibole schist host. The surrounding non-corundum bearing chlorite schist mainly comprises clinochlore. Petrographic examination of the mineral assemblages within the corundum-bearing schists revealed strong fracturing and alignment (parallel to the main regional foliation) of the corundum grains and margarite reaction rims around the corundum. The surrounding non-corundum amphibolites also contain anorthite, along with relict sillimanite, kyanite, and chlorite/muscovite/epidote overprinting. Detailed LA-ICP-MS trace element analysis of the color range of corundum from the two occurrences showed the corundum to be mainly of metamorphic origin, though pale rubies from PAR-5 suggest some metasomatic influence. The corundum displays distinctive geochemical locality signatures, with a combination of high Cr (average 2300 ppm with 15% sample points on core positions >5000 ppm and maximum 8600 ppm); high Si (average 1400 ppm with 40% over 1500 ppm and maximum 2500 ppm), low Mg (average 30 ppm), and very low V, Ti, and Ga. Based on the literature for similar occurrences, and the mineral assemblages observed at Paranesti, the estimated P-T conditions of corundum formation are,7 kbar and <750 degrees C, similar to the mafic African amphibolite-hosted rubies. This study has found the Paranesti occurrences to be most similar to the Winza, Tanzania ruby deposit, whilst there are some similarities to other high-Cr ruby deposits, primarily the Fisken ae sset, Greenland and metamorphic amphibolitic schist hosted African deposits. The Paranesti corundum most likely formed during regional amphibolite facies metamorphism which created the Nestos Shear Zone, along with a lesser influence (primarily observed in the PAR-5 occurrence) of more localized metasomatism. Subsequent multiple greenschist facies retrogression of the occurrences resulted in the current-day host amphibole-chlorite schist assemblages. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Salvi, S. %A Giuliani, Gaston %A Andrianjakavah, P. R. %A Moine, B. %A Beziat, D. %A Fallick, A. %T Fluid inclusion and stable isotope constraints on the formation of the ianapera emerald deposit, southern madagascar %D 2017 %L fdi:010070896 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K southern Madagascar ; Ianapera ; emerald ; distal and proximal deposits ; fluid inclusions ; O-H isotopes ; scapolite ; tourmaline ; P-T-X conditions ; metasomatism %K MADAGASCAR %M ISI:000406369600006 %N 4 %P 619-650 %R 10.3749/canmin.1700017 %U https://www.documentation.ird.fr/hor/fdi:010070896 %> https://www.documentation.ird.fr/intranet/publi/2017/09/010070896.pdf %V 55 %W Horizon (IRD) %X The Ianapera emerald deposit is hosted in the Neoproterozoic Vohibory domain of southern Madagascar, within a tightly folded metamorphic sequence of mafic and ultramafic rocks (M-UMR), gneiss, and marble, a few kilometers north of the major tectonic break known as the Ianapera-Ampanihy Suture. Late-collisional metaluminous to peraluminous felsic intrusions outcrop in the area. Emerald occurs mostly within metasomatic phlogopitite and quartz-tourmaline veins, developed within lenses of M-UMR. Recent work recognized granitic pegmatites as the source of the emerald-forming fluids, leading to the classification of proximal and distal mineralization styles, based on whether or not pegmatites are associated with the phlogopitite, respectively (Andrianjakavah et al. 2009). Considerations of the chemistry of tourmaline and scapolite associated with emerald and beryl, data from fluid and solid inclusions in these minerals, thermodynamic calculations, and mineral thermobarometric data confirm that Be originated from the pegmatites, transported in a moderately saline aqueous fluid that exsolved at about 600 to 680 degrees C and 4-6 kbars. This fluid was enriched in alkali elements, incompatible elements and dissolved sulfur, and produced the proximal mineralization. Migration along fractures caused loss of at least part of the pegmatitic elements and local mixing with a metamorphic CO2-rich fluid, leading to the more distal mineralization at somewhat lower temperatures (520 to 650 degrees C). Oxygen and hydrogen stable isotopes were measured from beryl and emerald; the data corroborate a magmatic-hydrothermal origin for the mineralization and a common source for proximal and distal fluids. The calculated delta O-18(H2O) of 12.5% at 520 degrees C for the distal emerald and the delta D-H2O range measured from the channel of the emerald samples fit within the oxygen and hydrogen isotopic range of values defined for peraluminous granitic magmatism. The occurrence of a distal style of emerald mineralization such as typified by Ianapera suggests that metamorphic origin models for similar occurrences worldwide should be taken with care and possibly reconsidered in terms of source and origin of fluids and metals. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Pignatelli, I. %A Giuliani, Gaston %A Morlot, C. %A Rouer, O. %A Claiser, N. %A Chatagnier, P. Y. %A Goubert, D. %T Recent advances in understanding the similarities and differences of colombian euclases %D 2017 %L fdi:010070895 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K Colombia ; emerald belts ; euclase ; "trapiche' texture ; trace-elements ; REE ; germanium ; geological formation %K COLOMBIE %M ISI:000406369600014 %N 4 %P 799-820 %R 10.3749/canmin.1700011 %U https://www.documentation.ird.fr/hor/fdi:010070895 %> https://www.documentation.ird.fr/intranet/publi/2017/09/010070895.pdf %V 55 %W Horizon (IRD) %X Colombian euclase is rare and associated with emerald in medium-temperature hydrothermal veins hosted by Lower Cretaceous black shales (BS). The original sources of euclase production were the mining districts of Gachala and Chivor in the eastern emerald belt, but in 2016 euclases were also found at the La Marina mine in the western emerald belt. The present study is centered on a chemical and mineralogical examination of zoned Colombian euclase sold on the gem market as "trapiche'. Its texture is characterized by growth bands and sectors distinguished by the presence of numerous inclusions (mainly pyrite, carbonates, and organic matter) which represent around 0.2% of the total volume of the crystals. Xray computed tomography showed that the largest inclusions are randomly located, whereas the small inclusions are concentrated in the center of the crystals, along the crystallographic b axis, between neighboring growth sectors and between growth bands in each sector. The texture cannot be defined as "trapiche', like that of Colombian emeralds, because there is no matrix material from the surrounding BS trapped between the growth sectors and accumulated as dendrites. Three-phase fluid inclusions (FI) containing halite, liquid, and vapor phases are also observed in the euclase, and their volume is identical to that of the inclusions in emerald. Chromium and vanadium are the main chromophores, and the highest concentrations (1240 and 400 ppm, respectively) were found in deep blue-colored zones. Surprisingly, the euclase crystals have high Ge contents, between 230 and 530 ppm. The Rare Earth Element (REE) patterns of euclase are inherited from the enclosed BS or albitized and carbonatized BS. Euclase has the same REE pattern as emerald from the Gachala mines with an Eu anomaly (Eu/Eu* similar to 0.40) and a depletion in Heavy Rare Earth Elements (HREE). The present study allows for the reconstruction of the formation conditions of "trapiche' euclase and discussion about its probable geographic origin, i.e., the eastern emerald belt. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Feneyrol, J. %A Giuliani, Gaston %A Demaiffe, D. %A Ohnenstetter, D. %A Fallick, A. E. %A Dubessy, J. %A Martelat, J. E. %A Rakotondrazafy, A. F. M. %A Omito, E. %A IchanG'I, D. %A Nyamai, C. %A Wamunyu, A. W. %T Age and origin of the tsavorite and tanzanite mineralizing fluids in the neoproterozoic Mozambique metamorphic belt %D 2017 %L fdi:010070894 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K Neoproterozoic Metamorphic Mozambique Belt ; tsavorite ; tanzanite ; Sm/Nd ; dating ; Sr-O-S-isotopes ; fluid inclusion ; origin of the fluids. %K KENYA ; TANZANIE ; MADAGASCAR %M ISI:000406369600012 %N 4 %P 763-786 %R 10.3749/canmin.1600085 %U https://www.documentation.ird.fr/hor/fdi:010070894 %> https://www.documentation.ird.fr/intranet/publi/2017/09/010070894.pdf %V 55 %W Horizon (IRD) %X The genetic model previously proposed for tsavorite-(and tanzanite-) bearing mineralization hosted in the Neoproterozoic Metamorphic Mozambique Belt (stretching from Kenya through Tanzania to Madagascar) is refined on the basis of new Sm-Nd age determinations and detailed Sr-O-S isotope and fluid-inclusion studies. The deposits are hosted within meta-sedimentary series composed of quartzites, graphitic gneisses, calc-silicate rocks intercalated with meta-evaporites, and marbles. Tsavorite occurs either in nodules (also called "boudins') oriented parallel to the metamorphic foliation in all of the deposits in the metamorphic belt or in quartz veins and lenses located at the hinges of anticlinal folds (Lelatema fold belt and Ruangwa deposits, Tanzania). Gem tanzanite occurs in pockets and lenses in the Lelatema fold belt of northern Tanzania. The Sm-Nd isotopic data for tsavorites and tanzanites hosted in quartz veins and lenses from Merelani demonstrate that they formed at 600 Ma, during the retrograde metamorphic episode associated with the East African Orogeny. The tsavorites hosted in nodules do not provide reliable ages: their sedimentary protoliths had heterogeneous compositions and their Sm-Nd system was not completely rehomogenized, even at the local scale, by the fluid-absent metamorphic recrystallization. The initial Sr-87/(86) Sr isotopic ratios of calcite from marble and tanzanites from Merelani fit with the strontium isotopic composition of Neoproterozoic marine carbonates. Seawater sediment deposition in the Mozambique Ocean took place around 720 Ma. The quartz-zoisite O-isotopic thermometer indicates a temperature of formation for zoisite between 385 and 448 degrees C. The sulfur isotopic composition of pyrite (between -7.8 and -1.3% V-CDT) associated with tsavorite in the Lelatema fold belt deposits suggests the contribution of reduced marine sulfate. The sulfur in pyrite in the marbles was likely derived from bacterial sulfate reduction which produced H2S. Fluid inclusion data from tsavorite and tanzanite samples from the Merelani mine indicate the presence of a dominant H2S-S-8 +/-(CH4)+/-(N-2)+/-(H2O)-bearing fluid. In the deposits in Kenya and Madagascar, the replacement of sulfate by tsavorite in the nodules and the boron isotopic composition of tourmaline associated with tsavorite are strong arguments in favor of the participation of evaporites in garnet formation. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Belley, P. M. %A Dzikowski, T. J. %A Fagan, A. %A Cempirek, J. %A Groat, L. A. %A Mortensen, J. K. %A Fayek, M. %A Giuliani, Gaston %A Fallick, A. E. %A Gertzbein, P. %T Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin island, Nunavut, Canada %D 2017 %L fdi:010070893 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K sapphire ; corundum ; marble ; calc-silicate rock ; scapolite ; gem deposits ; metamarl ; nepheline ; proterozoic %K CANADA %M ISI:000406369600008 %N 4 %P 669-699 %R 10.3749/canmin.1700018 %U https://www.documentation.ird.fr/hor/fdi:010070893 %> https://www.documentation.ird.fr/intranet/publi/2017/09/010070893.pdf %V 55 %W Horizon (IRD) %X Gem-quality corundum (sapphire) occurs in scapolite-rich calc-silicate rock hosted in marble of the Lake Harbour Group near Kimmirut, southern Baffin Island. A deposit of blue and colorless gem corundum (Beluga occurrence) is compared to a similar calc-silicate pod generally lacking corundum but containing nepheline (Bowhead occurrence) and located 170 m to the SSW. Corundum formation was made possible by three equally important sequential metamorphic reactions: (1) formation of nepheline, diopside, and K-feldspar (inferred) at granulite facies peak metamorphic conditions; (2) partial retrograde replacement of the peak assemblage by phlogopite, oligoclase, calcite, and scapolite (Me-50-Me-67) as a result of CO2-, H2O-, Cl-, F-bearing fluid influx at 1782.5 +/- 3.7 Ma (P-T < 720 degrees C, 6.2 kbar); and (3) retrograde breakdown of scapolite + nepheline (with CO2-and H2O-bearing fluid) to form albite, muscovite, corundum, and calcite. Late, low-temperature zeolite mineralization is common in corundum-bearing zones. Based on thermodynamic models, the corundum-forming reaction only occurs in a <100 degrees C window with an upper limit determined by scapolite-nepheline stability, and a lower limit determined by the formation of Al-silicate rather than corundum. The protolith is inferred to be dolomitic argillaceous marl with no evidence to suggest the initial presence of evaporites. The enrichment of trace metals V and Cr, and the depletion of Co, Ni, and Mn, suggest reducing diagenetic conditions in the initial sediment. Beluga calc-silicate rock is strongly depleted in REE (Total REE similar to 18 ppm). Oxy-dravite delta B-11 (+3.9 +/- 0.7%) is consistent with a marine boron source. The oxygen isotope composition of corundum (delta O-18(VSMOW) = 16.4 +/- 0.1%) is comparable to that of corundum in marble or desilicated pegmatite associated with marble. Phlogopite and muscovite Ar-40/(39) Ar ages and calculated closure temperatures (considered estimates) are ca. 1640 Ma (T-c = 455 to 515 degrees C) and 1510 Ma (Tc = 410 to 425 degrees C), respectively. In the Lake Harbour Group, the most prospective areas for gem corundum exploration are expected to be contiguous to the thrust fault separating the Lake Harbour Group and Narsajuaq terranes, where the retrograde, amphibolite facies overprint of the granulite peak assemblages was most pervasive. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Fallick, A. E. %A Boyce, A. J. %A Pardieu, V. %A Pham, V. L. %T Pink and red spinels in marble: trace elements, oxygen isotopes, and sources %D 2017 %L fdi:010070892 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K marble ; pink and red spinel ; trace elements ; oxygen isotopes ; geographic ; origin %K ASIE ; AFRIQUE DE L'EST ; TAJIKISTAN ; VIET NAM ; MYANMAR ; KENYA ; TANZANIE ; SRI LANKA ; NEPAL ; PAKISTAN ; AFGHANISTAN %M ISI:000406369600011 %N 4 %P 743-761 %R 10.3749/canmin.1700009 %U https://www.documentation.ird.fr/hor/fdi:010070892 %> https://www.documentation.ird.fr/intranet/publi/2017/09/010070892.pdf %V 55 %W Horizon (IRD) %X The oxygen isotopic composition of pink to red and other colored spinels hosted by marbles worldwide have been combined with trace elements investigated by electron microprobe analysis (EMPA). For the first time, this database enables the characterization of the geographic origin of the main productive and historical sources of gem spinel. Three consistent sets of delta O-18 values were found for primary and placer deposits: (1) between 5.6 and 8.6% for the historical Kuh-i-Lal spinels from Tajikistan; (2) from 12.1 to 18.5% for spinels from An Phu and Cong Troi in Vietnam, and Namya from Myanmar; and (3) between 19.0 and 24.2% for spinels from Paigutan in Nepal, Kiswila and Ipanko in Tanzania, Pamreso in Kenya, Mogok in Myanmar, and An Phu in Vietnam. The variation in the delta O-18 values for most of the deposits can be related to the buffering of the metamorphic fluids by the oxygen isotope composition of the impure marbles. The delta O-18 values of Kuh-i-Lal spinels result from a metasomatic skarn process between granitic intrusives and marble. Trace elements, such as Fe-Zn-Cr-V-Ti, presented in various new chemical discrimination diagrams allow for the differentiation of all the pink to red spinels. The slight overlaps observed for some chemical domains can be resolved by combination with the O-isotope composition of spinel. The present study shows that it is possible to discriminate gem spinels hosted by marbles from different geographic regions of the world and provides new insights into the traceability of historical spinels such as those from Kuh-i-Lal. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Pignatelli, I. %A Giuliani, Gaston %A Ohnenstetter, D. %A Agrosi, G. %A Mathieu, S. %A Morlot, C. %A Branquet, Y. %T Colombian trapiche emeralds : recent advances in understanding their formation %D 2015 %L fdi:010066282 %G ENG %J Gems and Gemology %@ 0016-626X %K COLOMBIE %M ISI:000370881300002 %N 3 %P 222-259 %R 10.5741/gems.51.3.222 %U https://www.documentation.ird.fr/hor/fdi:010066282 %> https://www.documentation.ird.fr/intranet/publi/2016/03/010066282.pdf %V 51 %W Horizon (IRD) %X Colombia is the traditional source of the world's finest emeralds, including the famed trapiche crystals, with their distinctive texture resembling a wheel with six spokes, This gemological curiosity, found exclusively in the black shales of the country's western emerald zone, is linked to the peculiar structural geology of the deposits. The study presents a review and update on Colombian trapiche emeralds, followed by a three-dimensional examination of the crystals combined with spectroscopic and chemical analyses. The proposed formation model incorporates the structural geology of the deposits with the formation of trapiche and non-trapiche emeralds, The fluid accumulation at the faults' tip in the black shales leads to maximum fluid overpressure and sudden decompression and formation of the emerald bearing vein system. The authors show that trapiche emerald growth starts at the beginning of the decompression that is responsible for local supersaturation of the fluid. The hydrothermal fluid comes in contact with the black shale matrix, favoring the formation of emerald seed crystals. During the growth of these seeds, textural sector zoning occurs, sometimes associated with chemical sector zoning, along with displacement of the matrix. Displacement growth occurs because the emeralds continue their growth, pushing the matrix material away from the growing faces. An overgrowth, generally of gem quality, can form after decompression, surrounding the core, the arms, and the dendrites, restoring the emeralds' euhedral habit. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Pignatelli, I. %A Giuliani, Gaston %T Trapiche nomenclature : Reply %D 2015 %L fdi:010066280 %G ENG %J Gems and Gemology %@ 0016-626X %M ISI:000370716300032 %N 4 %P 463-463 %U https://www.documentation.ird.fr/hor/fdi:010066280 %> https://www.documentation.ird.fr/intranet/publi/2016/03/010066280.pdf %V 51 %W Horizon (IRD) %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Dubessy, J. %A Banks, D. A. %A Lhomme, T. %A Ohnenstetter, D. %T Fluid inclusions in ruby from Asian marble deposits : genetic implications %D 2015 %L fdi:010064783 %G ENG %J European Journal of Mineralogy %@ 0935-1221 %K ruby in marble ; meta-evaporites ; Asia ; microthermometry ; Raman spectroscopy ; crush-leach method ; fluid inclusion ; molten salts ; Na-K-Ca-Li-CO3-SO4-NO3-Cl-F system %K ASIE ; PAKISTAN ; AFGHANISTAN ; TADJIKISTAN ; NEPAL ; MYANMAR ; VIET NAM %M ISI:000357553500012 %N 3 %P 393-404 %R 10.1127/ejm/2015/0027-2442 %U https://www.documentation.ird.fr/hor/fdi:010064783 %> https://www.documentation.ird.fr/intranet/publi/2015/08/010064783.pdf %V 27 %W Horizon (IRD) %X Primary fluid inclusion (FI) assemblages in ruby from marble at Mogok and fifteen other deposits from central and Southeast Asia were studied by microthermometry, Raman spectroscopy and crush-leach analysis. Microthermometry combined with Raman spectroscopy investigations of primary FT in Mogok rubies indicated the simultaneous trapping of carbonic FT in the system CO2-H2S (+/- COS +/- S-8) and multi-solid carbonic FI in the system Na-K-Ca-CO3-SO4-NO3-Cl-F +/-(CO2-H2S). The multiple solids are mainly mixtures of Na-Ca-Al carbonates such as shortite and dawsonite, sulphates, phosphates, nitrates, fluorides, and chlorides such as halite. They represent the trapped recrystallised residues of molten salts formed during the metamorphism of evaporite lenses (chlorides and sulphates) intercalated in the carbonate rocks. Raman spectroscopy of solids in FT from all Asian rubies hosted in marbles identified both (i) accidentally trapped minerals mainly calcite, dolomite and rutile, and (ii) daughter phases, i.e., native sulphur, diaspore and boehmite, and Na-K-Ca chlorides, anhydrite, dawsonite, shortite and fluorides. Crush-leach analysis of ruby crystals identified chloride as the dominant anion, but sulphate and nitrate are present at only slightly lower concentrations, whereas they are the dominant species in some Pakistani deposits. The Na-K-Ca-Li-CO3-SO4-NO3-Cl-F molten salt assemblages and the presence of nitrate and phosphate indicate the deposition of the original sediments in a coastal sabkha with ephemeral marine and continental water flooding. Input of V- and Cr-bearing argillite to the salty mudflats insured the formation of rubies in marble during Cenozoic metamorphism. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Pivin, M. %A Fallick, A. E. %A Ohnenstetter, D. %A Song, Y. %A Demaiffe, D. %T Geochemical and oxygen isotope signatures of mantle corundum megacrysts from the Mbuji-Mayi kimberlite, Democratic Republic of Congo, and the Changle alkali basalt, China %D 2015 %L fdi:010064156 %G ENG %J Comptes Rendus Geoscience %@ 1631-0713 %K Oxygen isotopes ; Chemistry ; Corundum ; Kimberlite ; Alkali basalt ; Origin ; Mantle %K REPUBLIQUE DEMOCRATIQUE DU CONGO ; CHINE %M ISI:000353428100004 %N 1 %P 24-34 %R 10.1016/j.crte.2014.12.003 %U https://www.documentation.ird.fr/hor/fdi:010064156 %> https://www.documentation.ird.fr/intranet/publi/2015/05/010064156.pdf %V 347 %W Horizon (IRD) %X Oxygen isotope signatures of ruby and sapphire megacrysts, combined with trace-element analysis, from the Mbuji-Mayi kimberlite, Democratic Republic of Congo, and the Changle alkali basalt, China, provide clues to specify their origin in the deep Earth. At Mbuji-Mayi, pink sapphires have 8180 values in the range 4.3 to 5.4 parts per thousand (N=10) with a mean of 4.9 +/- 0.4 parts per thousand, and rubies from 5.5 to 5.6 parts per thousand (N=3). The Ga/Mg ratio of pink sapphires is between 1.9 and 3.9, and in rubies, between 0.6 and 2.6. The blue or yellow sapphires from Changle have delta O-18 values from 4.6 to 5.2 parts per thousand, with a mean of 4.9 +/- 0.2 parts per thousand (N=9). The Ga/Mg ratio is between 5.7 and 11.3. The homogenous isotopic composition of ruby suggests a derivation from upper mantle xenoliths (garnet lherzolite, pyroxenite) or metagabbros and/or lower crustal garnet clinopyroxenite eclogite-type xenoliths included in kimberlites. Data from the pink sapphires from Mbuji-Mayi suggest a mantle origin, but different probable protoliths: either subducted oceanic protolith transformed into eclogite with delta O-18 values buffered to the mantle value, or clinopyroxenite protoliths in peridotite. The Changle sapphires have a mantle O-isotope signature. They probably formed in syenitic magmas produced by low degree partial melting of a spinel Iherzolite source. The kimberlite and the alkali basalt acted as gem conveyors from the upper mantle up to the surface. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Dzikowski, T. J. %A Cempirek, J. %A Groat, L. A. %A Dipple, G. M. %A Giuliani, Gaston %T Origin of gem corundum in calcite marble : the Revelstoke occurrence in the Canadian Cordillera of British Columbia %D 2014 %L fdi:010062307 %G ENG %J Lithos %@ 0024-4937 %K Corundum ; Muscovite ; Calcite marble ; Oxygen isotopes ; Geochemistry ; Metamorphism %K CANADA %M ISI:000337851100020 %P 281-297 %R 10.1016/j.lithos.2014.03.030 %U https://www.documentation.ird.fr/hor/fdi:010062307 %> https://www.documentation.ird.fr/intranet/publi/2014/08/010062307.pdf %V 198 %W Horizon (IRD) %X The calcite marble-hosted gem corundum (ruby, sapphire) occurrence near Revelstoke, British Columbia, Canada, occurs in the Monashee Complex of the Omineca Belt of the Canadian Cordillera. Corundum occurs in thin, folded and stretched layers with green muscovite + Ba-bearing K-feldspar + anorthite (An(0.85-1)) +/- phlogopite +/- Na-poor scapolite. Other silicate layers within the marble are composed of: (1) diopside + tremolite quartz and (2) garnet (Alm(0.7-05)Grs(0.2-0.4)) + Na-rich scapolite + diopside + tremolite + Na,K-amphiboles. Non-silicate layers in the marble are either magnetite- or graphite-bearing. Predominantly pink (locally red or purple) opaque to transparent corundum crystals have elevated Cr2O3 (<= 0.21 wt.%) and variable amounts of TiO2; rare blue rims on the corundum crystals contain higher amounts of TiO2 (<= 0.53 wt.%) and Fe2O3 (<= 0.07 wt.%). The associated micas have elevated Cr, V, Ti, and Ba contents. Petrography of the silicate layers show that corundum formed from muscovite at the peak of metamorphism (similar to 650-700 degrees C at 8.5-9 kbar). Because the marble is almost pure calcite (dolomite is very rare), the corundum was preserved because it did not react with dolomite to spinel + calcite during decompression. The scapolite-bearing assemblages formed during or after decompression of the rock at similar to 650 degrees C and 4-6 kbar. Gem-quality corundum crystals formed especially on borders of the mica-feldspar layers in an assemblage with calcite. Whole rock geochemistry data show that the corundum-bearing silicate (mica-feldspar) layers formed by mechanical mixing of carbonate with the host gneiss protolith; the bulk composition of the silicate layers was modified by Si and Fe depletion during prograde metamorphism. High element mobility is supported by the homogenization of delta O-18 and delta C-13 values in carbonates and silicates for the marble and silicate layers. The silicate layers and the gneiss contain elevated contents of Cr and V due to the volcanoclastic component of their protolith. %$ 064 ; 066 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Rakotosamizanany, S. %A Giuliani, Gaston %A Ohnenstetter, D. %A Rakotondrazafy, A. F. M. %A Fallick, A. E. %A Paquette, J. L. %A Tiepolo, M. %T Chemical and oxygen isotopic compositions, age and origin of gem corundums in Madagascar alkali basalts %D 2014 %L fdi:010062240 %G ENG %J Journal of African Earth Sciences %@ 1464-343X %K Madagascar ; Placer in alkali-basalt ; Gem corundum deposits ; Chemical ; composition ; Oxygen isotopes ; Genetic model %K MADAGASCAR %M ISI:000336871400013 %N SI %P 156-170 %U https://www.documentation.ird.fr/hor/fdi:010062240 %> https://www.documentation.ird.fr/intranet/publi/2014/07/010062240.pdf %V 94 %W Horizon (IRD) %X Madagascar is a large producer of gem corundum recovered from continental basaltic fields. The main mining areas are sapphire-bearing palaeoplacer deposits such as Ambondromifehy and Nosy Be in Antsiranana Province, northern Madagascar; Soamiakatra-Mandrosohasina in Antananarivo Province, central Madagascar; and Vatomandry district in Toamasina Province, eastern Madagascar. In Antananarivo Province, Soamiakatra is a primary deposit where ruby is found in metagabbro and pyroxenite xenoliths, brought-up to the upper crust by the Ankaratra volcanics. Petrographic studies indicate two different conditions of ruby formation, at the boundary of the eclogite domain (T 1100 C, P 20 kb) and granulite facies (T 1100 C, P < 15 kb). In contrast, most of the sapphires in placer and paleoplacer have two origins: (i) differentiation of alkaline magma in chambers at the lower continental crust-mantle boundary (90% of the sapphires). They are related to syenite and anorthoclasite xenoliths in the basalts. These alkali-basalt hosts are linked with asthenosphere upwelling and E-W and N-5 lithosphere thinning during Oligocene-Quaternary times. Zircons associated with the sapphires from Mandrosohasina and Ambatomainty sapphire deposits gave U-Pb ages at 7 Ma. The sapphires have low 8180 values of 4.1 +/- 0.4%, (n = 8), within the range of sapphire in syenitic rocks. Chemical composition and mineral inclusions in sapphires, such as columbite-(Fe), tantalite-(Mn), pyrochlore group, samarksite group, uraninite and anorthoclase confirm their syenitic origin. (ii) metamorphic xenocrysts (10%) brought up by the same magma. Oxygen isotopic compositions of rubies from placer deposits, 8180 = 3.1 +/- 1.1%0(n = 6) are typical of ruby in mafic and ultramafic rocks and 'plumasite' in mafic rocks (1.25 < SO < 7.5%0, n = 35). In Toamasina Province, the sapphires of Vatomandry are mainly of metamorphic origin (similar to 85%) and their 8180 = 4.1 0.4 parts per thousand (n = 9) are low and overlaps the range defined for metasomatic sapphires linked to 'plumasites' and biotite schists in shear zones; 15% of the sapphires are magmatic in origin with a low delta O-18-isotopic range in the sapphire-bearing syenites field. In Antsiranana Province, there are no rubies and sapphires are either magmatic (similar to 40%) or metamorphic (similar to 60%) in origin. The 8180 = 4.5 +/- 0.5 parts per thousand (n = 11) values are similar to the mean 8180 of sapphires from other two Provinces. Two U/Pb ages on zircons gave two contrasted ages at respectively 40.6 Ma for Ambondromifehy and 0.7 Ma for Nosy Be sapphire deposits. The characteristics of the corundum, their isotopic compositions as well as their ages demonstrate the existence of two distinct sources of corundum associated with alkali-basalts in Madagascar. On one hand, the rubies associated with metagabbros and garnet-bearing pyroxenites are linked to mafic and ultramafic complexes of eclogite facies at the boundary between lower crust and upper mantle, retrograded to granulite fades during the Pan-African event. On the other hand, the sapphires brought up during the Eocene to Quaternary are interpreted to be either magmatic and coeval with a volcanic event involving differentiated alkaline magma, or metamorphic and extracted from the pre-existing Precambrian basement during the extrusion of the magma. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Nédélec, A. %A Guillaume, D. %A Cournède, C. %A Duran, C. %A Macouin, M. %A Rakotondrazafy, M. %A Giuliani, Gaston %T Incipient charnockitisation due to carbonic fluid transfer related to late Pan-African transcurrent tectonics in Madagascar; implications for mobility of Fe, Ti, REE and other elements %D 2014 %L fdi:010062245 %G ENG %J Journal of African Earth Sciences %@ 1464-343X %K Charnockite ; CO2 ; Magnetic susceptibility ; Madagascar ; Pan-African %K MADAGASCAR %M ISI:000336871400007 %N SI %P 86-99 %R 10.1016/j.jafrearsci.2013.07.005 %U https://www.documentation.ird.fr/hor/fdi:010062245 %> https://www.documentation.ird.fr/intranet/publi/2014/07/010062245.pdf %V 94 %W Horizon (IRD) %X Incipient charnockitisation of an A-type granite protolith has been recognized in a spectacular outcrop 35 km north of Antananarivo. The charnockites form structurally-controlled dark greenish patches suggesting channelized fluid transfer, during and after partial reworking of the granite coeval with the Antananarivo virgation zone (ca 560 Ma) and/or the Angavo shear zone of late-Panafrican age (ca 550 Ma). They are characterized by a significant increase of the bulk magnetic susceptibility. The granitic protolith contains quartz, perthitic alkali feldspar, high-Ti hastingsitand accessory minerals (apatite, allanite, magnetite and zircon). The charnockitic granite contains quartz, perthitic alkali feldspar and ghost (altered) orthopyroxene crystals, as well as secondary low-Ti hastingsite surrounding orthopyroxene. The large increase of magnetic susceptibility magnitudes is related to the formation of pockets of secondary magnetite, spatially associated with quartz and other accessories, such as fluorine, calcite, bastnaesite, sphalerite, Ti-oxide and (Ca, REE)fluor-carbonates, in fluid percolation zones or in reaction rims around ghost orthopyroxene. Fluid inclusions entrapped in quartz grains witness the presence of CO2-rich hydrocarbonic fluids of low salinity, that are more abundant in charnockites than in granites. It is suggested that the rocks underwent a rather long history of fluid percolation, leading to prograde and then retrograde transformations. The corresponding metasomatic changes point to the mobility of Ti, Fe, Ca, Zn, F and REE. These changes are consistent with the CO2-rich nature of the percolating fluids. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Feneyrol, J. %A Giuliani, Gaston %A Ohnenstetter, D. %A Rondeau, B. %A Fritsch, E. %A Fallick, A. E. %A Ichang'i, D. %A Omito, E. %A Rakotondrazafy, M. %A Ranatsenho, M. %A Lallier, F. %T New typology and origin of tsavorite based on trace-element chemistry %D 2014 %L fdi:010062020 %G ENG %J European Journal of Mineralogy %@ 0935-1221 %K tsavorite ; green grossular ; electron microprobe analysis ; UV-Vis-NIR ; absorption spectra ; chemical typology ; V/Cr ratio ; garnet ; geographic origin ; gemmology %K AFRIQUE DE L'EST ; KENYA ; TANZANIE ; MADAGASCAR %M ISI:000334918100009 %N 2 %P 293-308 %R 10.1127/0935-1221/2014/0026-2367 %U https://www.documentation.ird.fr/hor/fdi:010062020 %> https://www.documentation.ird.fr/intranet/publi/2014/06/010062020.pdf %V 26 %W Horizon (IRD) %X New electron-microprobe analyses of 'tsavorites' from the Neoproterozoic Metamorphic Mozambique Belt deposits allow the characterization of green grossular according to its trace-element chemistry (V, Cr, Mn). Five chemical types are defined: type 1, vanadian grossular with V > Cr > Mn (in atoms per formula unit); type 2, vanadian grossular with V > Mn > Cr; type 3, Mn-bearing vanadian grossular with Mn > V > Cr; type 4, Mn-bearing chromian grossular with Mn > Cr > V; and type 5, Cr- and Mn-bearing grossular with Cr > Mn > V. These types are also characterized by different absorption spectra in the ultraviolet-visible-near infrared. Type 1 tsavorite spectra show a total absorption below 430 nm due to the high vanadium contents. Type 2 tsavorite spectra present the classical absorption bands of V. Types 3 and 4 tsavorite spectra display additional shoulders at 407 and 408 nm due to Mn2+, whereas spectra of Cr-bearing types 4 and 5 tsavorite show the two additional bands of Cr3+ at 697 and 701 nm. The different absorption spectra also indicate Fe2+-Ti4+ charge transfer. We measured OH equivalent to 0.08 to 0.38 wt% eq. H2O within the structure. Concentrations of vanadium, chromium and manganese are good chemical "fingerprints" for determining the geographic provenance of economic tsavorite from Kenya, Tanzania and Madagascar. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Long, P. V. %A Pardieu, V. %A Giuliani, Gaston %T Update on gemstone mining in Luc Yen, Vietnam %D 2013 %L fdi:010061762 %G ENG %J Gems and Gemology %@ 0016-626X %K VIETNAM %M ISI:000331152900003 %N 4 %P 233-245 %R 10.5741/gems.49.4.233 %U https://www.documentation.ird.fr/hor/fdi:010061762 %> https://www.documentation.ird.fr/intranet/publi/2014/03/010061762.pdf %V 49 %W Horizon (IRD) %X In 1987, gems were discovered in the Luc Yen area of Vietnam's Yen Bai province. Ruby, sapphire, and spinel from primary and secondary deposits are the most valuable of these; tourmaline, gem-quality feldspar, pargasite, and humite are also mined there. As a result of this discovery, the Luc Yen district has become Vietnam's most important gemstone-trading center over the past 30 years. The markets of Yen The, the capital of Luc Yen, offer an additional assortment of natural gems from Vietnam and elsewhere (including peridot, beryl, aquamarine, topaz, and quartz); synthetic gems are also found in these markets. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Feneyrol, J. %A Giuliani, Gaston %A Ohnenstetter, D. %A Fallick, A. E. %A Martelat, J. E. %A Monie, P. %A Dubessy, J. %A Rollion-Bard, C. %A Le Goff, E. %A Malisa, E. %A Rakotondrazafy, A. F. M. %A Pardieu, V. %A Kahn, T. %A Ichangi, D. %A Venance, E. %A Voarintsoa, N. R. %A Ranatsenho, M. M. %A Simonet, C. %A Omito, E. %A Nyamai, C. %A Saul, M. %T New aspects and perspectives on tsavorite deposits %D 2013 %L fdi:010060328 %G ENG %J Ore Geology Reviews %@ 0169-1368 %K Neoproterozoic Metamorphic Mozambique ; Belt ; Tsavorite ; Graphitic ; gneiss ; Evaporites ; Metasomatism ; Genetic model %M ISI:000318453000001 %P 1-25 %R 10.1016/j.oregeorev.2013.01.016 %U https://www.documentation.ird.fr/hor/fdi:010060328 %> https://www.documentation.ird.fr/intranet/publi/2013/06/010060328.pdf %V 53 %W Horizon (IRD) %X Tsavorite, the vanadian variety of green grossular, is a high value economic gemstone. It is hosted exclusively in the metasedimentary formations from the Neoproterozoic Metamorphic Mozambique Belt. The deposits are mined in Kenya, Tanzania and Madagascar and other occurrences are located in Pakistan and East Antarctica. They are located within metasomatized graphitic rocks such as graphitic gneiss and calc-silicates, intercalated with meta-evaporites. Tsavorite is found as primary deposits either in nodule (type I) or in quartz vein (type II), and in placers (type III). The primary mineralizations (types I and II) are controlled by lithostratigraphy and/or structure. For the African occurrences, the protoliths of the host-rocks were deposited at the beginning of the Neoproterozoic within a marine coastal sabkha environment, located at the margin of the Congo-Kalahari cratons in the Mozambique Ocean. During the East African-Antarctican Orogeny, the rocks underwent high amphibolite to granulite fades metamorphism and the formation of tsavorite deposits occurred between 650 and 550 Ma. The nodules of tsavorite were formed during prograde metamorphism, calcium coming from sulphates and carbonates, whereas alumina, silicates, vanadium and chromium probably came from clays and chlorite. The veins were formed during the deformation of the metasedimentary platform units which experienced shearing, leading to the formation of fault-filled veins. Metasomatism developed during retrograde metamorphism. The metasedimentary sequences are characterized by the presence of evaporitic minerals such as gypsum and anhydrite, and scapolite. Evaporites are essential as they provide calcium and permit the mobilization of all the chemical elements for tsavorite formation. The H2S-S-8 metamorphic fluids characterized in primary fluid inclusions of tsavorites and the delta B-11 values of coeval dravite confirm the evaporitic origin of the fluids. The V2O3 and Cr2O3 contents of tsavorite range respectively from 0.05 to 7.5 wt.%, while their delta O-18 values are in the range of 9.5-21.1 parts per thousand. The genetic model proposed for tsavorite is metamorphic, based on chemical reactions developed between an initial assemblage composed of gypsum and anhydrite, carbonates and organic matter deposited in a sabkha-like sedimentary basin. %$ 064 %0 Edited Book %9 DO : Directions d'ouvrages ou de revues %A Giuliani, Gaston %T Les gemmes du Gondwana %D 2013 %L fdi:010059839 %G FRE %J Les Cahiers du Règne Minéral %@ 2261-1150 %K MINERAL ; ROCHE METAMORPHIQUE ; MINERALOGIE ; GITOLOGIE ; GISEMENT ENDOGENE ; PRECAMBRIEN ; OROGENESE ; GEOLOGIE STRUCTURALE ; LITHOLOGIE ; CRISTALLOGRAPHIE ; EXPLOITATION ECONOMIQUE ; MINE ; PRIX ; MARCHE ; HISTOIRE %K GONDWANA ; GEMME ; CORINDON ; RUBIS ; DIAMANT ; TSAVORITE ; TANZANITE ; EMERAUDE ; SAPHIR ; TOURMALINE ; GRENAT %K AFRIQUE DE L'EST ; MADAGASCAR ; INDE ; SRI LANKA ; TANZANIE ; MOZAMBIQUE ; KENYA ; MALAWI ; PAKISTAN ; ANTARCTIQUE %N 2 %P 146 %U https://www.documentation.ird.fr/hor/fdi:010059839 %W Horizon (IRD) %$ 064PETRO %0 Edited Book %9 DO : Directions d'ouvrages ou de revues %A Giuliani, Gaston %T Les gemmes du Gondwana : introduction %B Les gemmes du Gondwana %D 2013 %E Giuliani, Gaston %E Ohnenstetter, D. %E Feneyrol, J. %L fdi:010059840 %G FRE %J Les Cahiers du Règne Minéral %@ 2261-1150 %K MINERAL ; ROCHE METAMORPHIQUE ; MINERALOGIE ; GITOLOGIE ; GISEMENT ENDOGENE ; PRECAMBRIEN ; OROGENESE ; GEOLOGIE STRUCTURALE ; LITHOLOGIE ; CRISTALLOGRAPHIE ; EXPLOITATION ECONOMIQUE ; MINE ; PRODUCTION ; PRIX ; MARCHE ; HISTOIRE %K GONDWANA ; GEMME ; CORINDON ; RUBIS ; DIAMANT ; TSAVORITE ; TANZANITE ; EMERAUDE ; SAPHIR ; TOURMALINE ; GRENAT %K AFRIQUE DE L'EST ; MADAGASCAR ; INDE ; SRI LANKA ; TANZANIE ; MOZAMBIQUE ; KENYA ; MALAWI ; PAKISTAN ; ANTARCTIQUE %N 2 %P 7-12 %U https://www.documentation.ird.fr/hor/fdi:010059840 %W Horizon (IRD) %$ 064PETRO %0 Edited Book %9 DO : Directions d'ouvrages ou de revues %A Giuliani, Gaston %T Les gemmes néoprotérozoïques de la ceinture métamorphique mozambicaine du supercontinent Gondwanana (1000-542 Ma) %B Les gemmes du Gondwana %D 2013 %E Feneyrol, J. %E Giuliani, Gaston %E Ohnenstetter, D. %E Le Goff, E. %E Simonet, C. %E Rakotondrazafy, M. %E Ichang'i, D. %E Malisa, E. %E Deschamps, Y. %E Fallick, A. %E Khan, T. %E Nyamai, C. %L fdi:010059841 %G FRE %J Les Cahiers du Règne Minéral %@ 2261-1150 %K MINERAL ; ROCHE METAMORPHIQUE ; GITOLOGIE ; MINERALISATION ; PRECAMBRIEN ; GEODYNAMIQUE ; COMPRESSION TECTONIQUE ; OROGENESE ; METAMORPHISME ; GEOLOGIE STRUCTURALE ; LITHOLOGIE %K GONDWANA ; GEMME ; CORINDON ; RUBIS ; DIAMANT ; TSAVORITE ; TANZANITE ; EMERAUDE ; SAPHIR ; TOURMALINE ; GRENAT %K AFRIQUE DE L'EST ; MADAGASCAR ; INDE ; SRI LANKA ; TANZANIE ; MOZAMBIQUE ; KENYA ; MALAWI ; PAKISTAN ; ANTARCTIQUE %N 2 %P 13-43 %U https://www.documentation.ird.fr/hor/fdi:010059841 %W Horizon (IRD) %$ 064PETRO %0 Edited Book %9 DO : Directions d'ouvrages ou de revues %A Giuliani, Gaston %T A la poursuite du grenat vert vanadifère "Tsavorite" %B Les gemmes du Gondwana %D 2013 %E Feneyrol, J. %E Giuliani, Gaston %E Ohnenstetter, D. %E Fallick, A.E. %E Martelat, J.E. %E Monié, P. %E Dubessy, J. %E Rollion-Bard, C. %E Le Goff, E. %E Malisa, E. %E Rakotondrazafy, M. %E Pardieu, V. %E Kahn, T. %E Ichang'i, D. %E Venance, E. %E Voarintsoa, R. %E Ranatsenho, M. %E Simonet, C. %E Omito, E. %E Nyamai, C. %E Saul, M. %E Saul, E. %L fdi:010059842 %G FRE %J Les Cahiers du Règne Minéral %@ 2261-1150 %K MINERAL ; ROCHE METAMORPHIQUE ; GITOLOGIE ; GISEMENT ENDOGENE ; PRECAMBRIEN ; EXPLOITATION ECONOMIQUE ; MINE %K GEMME ; TSAVORITE ; GRENAT %K KENYA ; TANZANIE ; MADAGASCAR ; PAKISTAN ; ANTARCTIQUE %N 2 %P 57-70 %U https://www.documentation.ird.fr/hor/fdi:010059842 %W Horizon (IRD) %$ 064PETRO %0 Edited Book %9 DO : Directions d'ouvrages ou de revues %A Giuliani, Gaston %T La reine bleue de l'Afrique de l'Est : la tanzanite, une zoïsite vanadifère %B Les gemmes du Gondwana %D 2013 %E Giuliani, Gaston %E Ohnenstetter, D. %E Feneyrol, J. %E Rakotondrazafy, M. %E Ichang'i, D. %E Malisa, E. %E Deschamps, Y. %E Fallick, A. %E Khan, T. %E Nyamai, C. %L fdi:010059843 %G FRE %J Les Cahiers du Règne Minéral %@ 2261-1150 %K MINERAL ; ROCHE METAMORPHIQUE ; EXPLOITATION ECONOMIQUE ; MINE ; GITOLOGIE ; GISEMENT ENDOGENE ; COMMERCIALISATION ; PRIX ; HISTOIRE ; MINERALOGIE ; CRISTALLOGRAPHIE ; COMPOSITION CHIMIQUE ; COULEUR %K GEMME ; TANZANITE ; GONDWANA %K TANZANIE %K MERELANI %N 2 %P 71-83 %U https://www.documentation.ird.fr/hor/fdi:010059843 %W Horizon (IRD) %$ 064PETRO %0 Edited Book %9 DO : Directions d'ouvrages ou de revues %A Giuliani, Gaston %T Les corindons d'âge néoprotérozoïque de Madagascar %B Les gemmes du Gondwana %D 2013 %E Andriamamonjy, A. %E Giuliani, Gaston %E Ohnenstetter, D. %E Rakotondrazafy, M. %E Ralantoarison, T. %E Ranatsenho, M. %E Rakotosamizanany, S. %E Fallick, A. %L fdi:010059844 %G FRE %J Les Cahiers du Règne Minéral %@ 2261-1150 %K MINERAL ; ROCHE METAMORPHIQUE ; GITOLOGIE ; GISEMENT ENDOGENE ; LITHOLOGIE ; ROCHE ENCAISSANTE ; GENESE ; PRECAMBRIEN %K GEMME ; CORINDON ; RUBIS ; SAPHIR ; GONDWANA %K MADAGASCAR %K SAHAMBO ; ZAZAFOTSY ; IANKAROKA ; AMBATOMENA %N 2 %P 109-117 %U https://www.documentation.ird.fr/hor/fdi:010059844 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 PV Publications de vulgarisation %A Groat, L. %A Giuliani, Gaston %T La géologie des gemmes %D 2012 %L fdi:010056489 %G FRE %J Pour la Science %@ 0153-4092 %K GITOLOGIE ; GEOCHIMIE ; TECHNOLOGIE ; IMAGE SATELLITAIRE %K GEMMOLOGIE %N 418 %P 58-65 %U https://www.documentation.ird.fr/hor/fdi:010056489 %> https://www.documentation.ird.fr/intranet/publi/depot/2012-07-26/010056489.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Feneyrol, J. %A Ohnenstetter, D. %A Giuliani, Gaston %A Fallick, A. E. %A Rollion-Bard, C. %A Robert, J. L. %A Malisa, E. P. %T Evidence of evaporites in the genesis of the vanadian grossular 'tsavorite' deposit in Namalulu, Tanzania %D 2012 %L fdi:010081636 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K Mozambique Belt ; Tanzania ; Namalulu ; tsavorite ; vanadian mineralization ; graphitic gneiss ; carbonates ; evaporites ; tainiolite %M ISI:000308799500011 %N 3 %P 745-769 %R 10.3749/canmin.50.3.745 %U https://www.documentation.ird.fr/hor/fdi:010081636 %> https://www.documentation.ird.fr/intranet/publi/depot/2021-03-11/010081636.pdf %V 50 %W Horizon (IRD) %X The Namalulu tsavorite (vanadian grossular up to 0.80 wt.% V2O3) deposit in northeastern Tanzania occurs in metasomatized graphitic gneiss overlain by a dolomitic marble unit. These rocks belong to the Neoproterozoic metamorphic Mozambique Belt. The graphitic gneiss is composed of quartz, V-bearing kyanite (up to 0.4 wt.% V2O3), V-bearing muscovite (up to 1.0 wt.% V2O3), V-bearing rutile (up to 1.9 wt.% V2O3), and graphite. This rock is affected by calcic metasomatism precipitating calcite and mobilizing the elements for tsavorite crystallization in quartz-calcite veins. The dolomitic marble unit hosts an anhydrite-gypsum-dolomite lens (lens I) and a calcite-scapolite-diopside-sulfides-graphite lens (lens II). This last unit is characterized by the presence of F-bearing minerals (tremolite, phlogopite, tainiolite, titanite), with up to 9.4 wt.% F for tainiolite, and Ba-bearing minerals (feldspar, phlogopite), with up to 7.5 wt.% BaO for feldspar. Lithium (up to 2.0 wt.% Li2O) and boron (up to 110 ppm) are also present in tainiolite, as well as in F-bearing tremolite. This is the first description of metamorphic tainiolite. The protoliths of the Namalulu rocks correspond to organic-rich black shales, pure and magnesian carbonates, and evaporites. They were presumably deposited in a marine coastal sabkha located at the eastern margin of the Congo-Kalahari cratons bounded by the Mozambique Ocean during early Neoproterozoic. Tsavorite formed in the Ca-metasomatized gneiss during amphibolite facies retrograde metamorphism at 5.6-6.7 kbar and 630 +/- 30 degrees C. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Uher, P. %A Giuliani, Gaston %A Szakall, S. %A Fallick, A. %A Strunga, V. %A Vaculovic, T. %A Ozdin, D. %A Greganova, M. %T Sapphires related to alkali basalts from the Cerova Highlands, Western Carpathians (southern Slovakia) : composition and origin %D 2012 %L fdi:010055733 %G ENG %J Geologica Carpathica %@ 1335-0552 %K Western Carpathians ; Slovakia ; Hajnacka ; Gortva ; CL ; LA-ICP-MS ; EMPA ; oxygen isotopes ; placer ; alkali basalts ; anorthoclasite xenolith ; corundum ; sapphire %K SLOVAQUE REPUBLIQUE %M ISI:000301748900005 %N 1 %P 71-82 %R 10.2478/v10096-012-0005-7 %U https://www.documentation.ird.fr/hor/fdi:010055733 %> https://www.documentation.ird.fr/intranet/publi/2012/04/010055733.pdf %V 63 %W Horizon (IRD) %X Blue, grey-pink and pink sapphires from the Cerova Highlands, Western Carpathians (southern Slovakia) have been studied using CL, LA-ICP-MS, EMPA, and oxygen isotope methods. The sapphire occurs as (1) elastic heavy mineral in the secondary sandy filling of a Pliocene alkali basaltic maar at Hajnacka, and (2) crystals in a pyroxene-bearing syenite/anorthoclasite xenolith of Pleistocene alkali basalt near Gortva. Critical evaluation of compositional diagrams (Fe, Ti, Cr, Ga, Mg contents, Fe/Ti, Cr/Ga, Ga/Mg ratios) suggests a magmatic origin for elastic blue sapphires with lower Cr and Mg, but higher Fe and Ti concentrations in comparison to the grey-pink and pink varietes, as well as similar compositional trends with blue sapphire from the Gortva magmatic xenolith. Moreover, blue sapphires show similar delta O-18 values: 5.1 parts per thousand in the Gortva xenolith, 3.8 and 5.85 parts per thousand in the Hajnacka placer, closely comparable to mantle to lower crustal magmatic rocks. On the contrary, pink and grey-pink sapphires show higher Cr and Mg, but lower Fe and Ti contents and their composition points to a metamorphic (metasomatic) origin. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Fallick, A. E. %A Feneyrol, J. %A Ohnenstetter, D. %A Pardieu, V. %A Saul, M. %T O-18/O-16 and V/Cr ratios in gem tsavorites from the Neoproterozoic Mozambique metamorphic belt : a clue towards their origins ? %D 2011 %L fdi:010054090 %G ENG %J Mineralium Deposita %@ 0026-4598 %K Mozambique Metamorphic Belt ; Tsavorite ; Oxygen isotopes ; V/Cr ratio ; Mn ; Geographic and geologic origins %M ISI:000296065900001 %N 7 %P 671-676 %R 10.1007/s00126-011-0355-6 %U https://www.documentation.ird.fr/hor/fdi:010054090 %> https://www.documentation.ird.fr/intranet/publi/2011/11/010054090.pdf %V 46 %W Horizon (IRD) %X The combination of oxygen isotope composition with V-Cr-Mn trace element concentrations of V-bearing garnets (tsavorites) originating from the main deposits of the Neoproterozoic Mozambique Metamorphic Belt is reported for the first time. The database enables the identification of the geological and geographical sources of the main productive areas from northern and southern Tanzania, Kenya, and Madagascar. Three consistent sets of delta O-18 values between 9.5aEuro degrees and 11.0aEuro degrees, 11.6aEuro degrees and 14.5aEuro degrees, and 15.5aEuro degrees and 21.1aEuro degrees have been recognized for primary deposits hosted in graphitic gneisses related to the Neoproterozic metasedimentary series. The delta O-18 value of tsavorite is a good tracer of the environment of its formation; the delta O-18 of the fluid in equilibrium with tsavorite was buffered by the host rock during metamorphism and fluid-rock interaction. This study is a first step in characterizing the geochemistry of gem tsavorite from most of the deposits and occurrences worldwide. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Ohnenstetter, D. %A Fallick, A. E. %A Feneyrol, J. %T State of the art in the formation of high-value colored stones %D 2011 %L PAR00007896 %G ENG %J Gems and Gemology %@ 0016-626X %M ISI:000294191700015 %N 2 %P 108-110 %U https://www.documentation.ird.fr/hor/PAR00007896 %V 47 %W Horizon (IRD) %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Galoisy, L. %A Feneyrol, J. %A Juhin, A. %A Kiratisin, A. %A Giuliani, Gaston %A Calas, G. %T The origin of coloration in garnets : an optical spectroscopic study %D 2010 %L fdi:010053005 %G ENG %J Geochimica et Cosmochimica Acta %@ 0016-7037 %M ISI:000283941401003 %N 12 %P A314-A314 %U https://www.documentation.ird.fr/hor/fdi:010053005 %> https://www.documentation.ird.fr/intranet/publi/2011/01/010053005.pdf %V 74 %W Horizon (IRD) %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Feneyrol, J. %A Giuliani, Gaston %A Ohnenstetter, D. %A Le Goff, E. %A Malisa, E. P. J. %A Saul, M. %A Saul, E. %A Saul, J. %A Pardieu, V. %T Lithostratigraphic and structural controls of 'tsavorite' deposits at Lemshuku, Merelani area, Tanzania %D 2010 %L fdi:010052900 %G ENG %J Comptes Rendus Geoscience %@ 1631-0713 %K Tanzania ; Lemshuku Mine ; "Tsavorite" ; Quartz vein ; Lithostratigraphic ; and structural controls %M ISI:000283470000003 %N 10 %P 778-785 %R 10.1016/j.crte.2010.06.003 %U https://www.documentation.ird.fr/hor/fdi:010052900 %> https://www.documentation.ird.fr/intranet/publi/2010/11/010052900.pdf %V 342 %W Horizon (IRD) %X The first study of the Lemshuku 'tsavorite' mining district is presented. From bottom to top, the lithostratigraphic column corresponds to a metasedimentary sequence composed of quartzite, fine-grained graphitic gneiss, kyanite-graphite gneiss, biotite-almandine gneiss, metasomatized graphitic gneiss and dolomitic marble. 'Tsavorite' occurs in quartz veins and rarely as nodular concretions. Two factors control mineralization: (1) lithostratigraphy, with 'tsavorite' in association with pyrite and graphite confined to quartz veins within the metasomatized graphitic gneiss: and (2) structure, with the mineralized veins characteristically controlled by tight isoclinal folds associated with shearing. %$ 064 %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %A Rakotondrazafy, M. %A Ohnenstetter, D. %A Carlier, Gabriel %A Lorand, J.P. %A Rondeau, B. %A Moine, B. %A Fontant, F. %T Géologie et minéralogie %B Parcours de recherche à Madagascar : l'IRD-ORSTOM et ses partenaires %C Marseille %D 2010 %E Feller, Christian %E Sandron, Frédéric %L fdi:010051651 %G FRE %I IRD %@ 978-2-7099-1695-0 %K GEOLOGIE ; MINERALOGIE ; METALLOGENIE ; RECHERCHE SCIENTIFIQUE ; DEVELOPPEMENT ; COOPERATION SCIENTIFIQUE ; FORMATION PROFESSIONNELLE %K HISTOIRE DES SCIENCES %K MADAGASCAR %P 295-319 %U https://www.documentation.ird.fr/hor/fdi:010051651 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers12-09/010051651.pdf %W Horizon (IRD) %S Synthèses %$ 064GEOGEN %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Andrianjakavah, P. R. %A Salvi, S. %A Béziat, D. %A Rakotondrazafy, M. %A Giuliani, Gaston %T Proximal and distal styles of pegmatite-related metasomatic emerald mineralization at Ianapera, southern Madagascar %D 2009 %L fdi:010048271 %G ENG %J Mineralium Deposita %@ 0026-4598 %K Emerald ; Beryl ; Pegmatite ; Phlogopitite ; Ianapera ; Madagascar %M ISI:000270585100006 %N 7 %P 817-835 %R 10.1007/s00126-009-0243-5 %U https://www.documentation.ird.fr/hor/fdi:010048271 %> https://www.documentation.ird.fr/intranet/publi/2009/10/010048271.pdf %V 44 %W Horizon (IRD) %X The Ianapera emerald deposit is located in the Neoproterozoic Vohibory Block of southern Madagascar. The local geology consists of intercalated migmatitic gneissic units and calcareous metasedimentary rocks, containing boudinaged metamorphosed mafic/ultramafic lenses, all intruded by pegmatite veins. These units occur near the hinge of the tightly folded Ianapera antiform, within a few kilometers of the Ampanihy shear zone. Emerald mineralization is hosted by metasomatic phlogopite veins, and bodies developed within the mafic/ultramafic rocks. Based on field and textural relationships, we distinguish proximal and distal styles of mineralization. Proximal mineralization occurs at the contact of pegmatite veins with mafic/ultramafic units; in the distal style, pegmatites are not observed. Three types of emeralds could be distinguished, mainly on the basis of color and mineral zoning. Some of these emeralds have the most Al-depleted and Cr-rich composition ever recorded. Another characteristic feature to the Ianapera deposit and, to our knowledge, yet unreported, is the association of some emeralds with scapolite in metasomatised mafic rocks. Mineral inclusions are common in most emeralds and include phlogopite, carbonates, barite, K-feldspar, quartz, pyrite, zircon, monazite, bastnaesite, phenakite, plus Fe and Cr oxides. However, feldspar and rare earth element-bearing minerals occur predominantly in proximal emeralds, which also have a more incompatible trace-element signature than distal emeralds. We propose a model related to syn- to post-tectonic magmatic-hydrothermal activity. Pegmatitic bodies intruded units of the Ianapera antiform probably during tectonic relaxation. Exsolution of fluids rich in halogens and incompatible elements from the cooling pegmatites caused hydrothermal metasomatism of Cr-bearing mafic/ultramafic rocks in direct contact with the pegmatites. Local fracturing favored fluid infiltration, permitting the formation of distal mineralization. Emerald composition was controlled by the chemistry of the host rock. The presence of carbonate mineral inclusions in the emeralds and the high F-activity indicated by elevated F-contents in newly formed minerals suggest transport of Be as a fluoride-carbonate complex. It seems likely that beryl formation was triggered by precipitation of F-rich phlogopite, which removed the complexing ligand from the fluid. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Sutherland, F. L. %A Zaw, K. %A Meffre, S. %A Giuliani, Gaston %A Fallick, A. E. %A Graham, I. T. %A Webb, G. B. %T Gem-corundum megacrysts from east Australian basalt fields : trace elements, oxygen isotopes and origins %D 2009 %L PAR00004042 %G ENG %J Australian Journal of Earth Sciences %@ 0812-0099 %K Australia ; basalt fields ; gem corundum ; LA-ICP-MS ; oxygen isotopes ; ruby ; sapphire %M ISI:000269543200009 %N 7 %P 1003-1022 %R 10.1080/08120090903112109 %U https://www.documentation.ird.fr/hor/PAR00004042 %V 56 %W Horizon (IRD) %X Gem corundum, a minor but persistent megacryst in east Australian basalt fields, is mined from some placer concentrations. Laser ablation, inductively coupled plasma mass spectrometry analyses and O isotope determinations on a colour range of corundum from different fields, show that chromophore (Fe, Cr, Ti, V) and genetic indicator (Ga, Mg, 18O) values can distinguish corundum sources (magmatic, metamorphic and metasomatic) before basalt incorporation. They also characterise corundum groups from different fields. This identified two metamorphic groups, one carrying ruby at Barrington Tops, and a magmatic group distinct from those from other gem fields (lower Fe, northeast Tasmania; higher Fe, Yarrowitch). Ruby-bearing groups show clear provincial characteristics and include lower temperature spinel-facies groups (Barrington, Yarrowitch) and higher temperature garnet-facies groups (Cudgegong-Macquarie River). High Mg/Fe and Ni values in the latter approach those for corundum in diamond, and are a possible diamond indicator. The corundum derived from diverse fold-belt and felsic sources in underlying lithosphere forms a dataset for comparing corundum from other basalt fields. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Brand, A. A. %A Groat, L. A. %A Linnen, R. L. %A Garland, M. I. %A Breaks, F. W. %A Giuliani, Gaston %T Emerald mineralization associated with the mavis lake pegmatite group, near Dryden, Ontario %D 2009 %L fdi:010081638 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K emerald ; geology ; mineralogy ; geochemistry ; fluid inclusions ; stable isotopes ; Mavis Lake pegmatite ; Dryden ; Ontario ; Canada %M ISI:000266617800006 %N Part 2 %P 315-336 %R 10.3749/canmin.47.2.315 %U https://www.documentation.ird.fr/hor/fdi:010081638 %> https://www.documentation.ird.fr/intranet/publi/depot/2021-03-11/010081638.pdf %V 47 %W Horizon (IRD) %X The Taylor 2 (also known as Ghost Lake) emerald showing near Dryden, in northwestern Ontario, is associated with a granitic pegmatite of the Mavis Lake Pegmatite Group proximal to the 2685 Ma Ghost Lake Batholith. The Taylor 2 pegmatite consists of three separate limbs that intruded a wide zone of chlorite schist near the eastern end of an altered ultramafic sill. Most of the beryl and emerald occurs in a "zone of mixing" between the southern and central limbs of the pegmatite. The rock in the "zone of mixing" consists of relict orange K-feldspar crystals (to 30 cm) in a matrix of anhedral bluish plagioclase, quartz, fine-grained black phlogopite, blue apatite crystals (to 1 cm), and black tourmaline crystals (to 2 cm). The beryl occurs as euhedral crystals up to 2.3 x 1.8 cm; most are opaque to translucent and white to pale green in color, but about 10% are emerald. The emerald compositions show average Cr concentrations of 0.25 wt.% Cr2O3 (maximum 0.42 wt.% Cr2O3 or 0.03 Cr apfu) and maximum V concentrations of 0.05 wt.% V2O3. Primary fluid inclusions in the emerald crystals show variable compositions and high temperatures of homogenization (to 490 degrees C). Oxygen isotope compositions of the emerald crystals, which average 9.6(7)%, suggest a high degree of homogenization and fluid buffering during fluid-rock interaction. Whole-rock compositions show high concentrations of Be (89 ppm) in the the Taylor 2 pegmatite and elevated Cr in the chlorite schist (2610 ppm) and the altered ultramafic sill (3050 ppm). Geochemical similarities support the hypothesis that the chlorite schist is the faulted analogue of the altered ultramafic sill. The absence of beryl in the latter unit may be due to lower amounts of fluid or F concentrations (similar to 150 ppm versus similar to 1300 ppm for the chlorite schist). The emerald in the Taylor 2 showing and the associated phlogopite most likely formed through metasomatism of the chlorite schist, which was driven by granitic magmatism. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Fallick, A. %A Ohnenstetter, D. %A Pegere, G. %T Oxygen isotopes composition of sapphires from the French Massif Central : implications for the origin of gem corundum in basaltic fields %D 2009 %L fdi:010044263 %G ENG %J Mineralium Deposita %@ 0026-4598 %K France ; French Massif Central ; Basalt ; Oxygen isotopes ; Sapphires %M ISI:000262988500006 %N 2 %P 221-231 %R 10.1007/s00126-008-0214-2 %U https://www.documentation.ird.fr/hor/fdi:010044263 %> https://www.documentation.ird.fr/intranet/publi/2009/02/010044263.pdf %V 44 %W Horizon (IRD) %X Alluvial and colluvial gem sapphires are common in the basaltic fields of the French Massif Central (FMC) but sapphire-bearing xenoliths are very rare, found only in the Menet trachytic cone in Cantal. The O-isotope composition of the sapphires ranges between 4.4 and 13.9aEuro degrees. Two distinct groups have been defined: the first with a restricted isotopic range between 4.4 and 6.8aEuro degrees (n = 22; mean delta O-18 = 5.6 +/- 0.7aEuro degrees), falls within the worldwide range defined for blue-green-yellow sapphires related to basaltic gem fields (3.0 < delta O-18 < 8.2aEuro degrees, n = 150), and overlaps the ranges defined for magmatic sapphires in syenite (4.4 < delta O-18 < 8.3aEuro degrees, n = 29). A second group, with an isotopic range between 7.6 and 13.9aEuro degrees (n = 9), suggests a metamorphic sapphire source such as biotite schist in gneisses or skarns. The delta O-18 values of 4.4-4.5aEuro degrees for the blue sapphire-bearing anorthoclasite xenolith from Menet is lower than the delta O-18 values obtained for anorthoclase (7.7-7.9aEuro degrees), but suggest that these sapphires were derived from an igneous reservoir in the subcontinental spinel lherzolitic mantle of the FMC. The presence of inclusions of columbite-group minerals, pyrochlore, Nb-bearing rutile, and thorite in these sapphires provides an additional argument for a magmatic origin. In the FMC lithospheric mantle, felsic melts crystallized to form anorthoclasites, the most evolved peraluminous variant of the alkaline basaltic melt. The O-isotopic compositions of the first group suggests that these sapphires crystallized from felsic magmas under upper mantle conditions. The second group of isotopic values, typified for example by the Le Bras sapphire with a delta O-18 of 13.9aEuro degrees, indicates that metamorphic sapphires from granulites were transported to the surface by basaltic magma. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Schwarz, D. %A Pardieu, V. %A Saul, J. M. %A Schmetzer, K. %A Laurs, B. M. %A Giuliani, Gaston %A Klemm, L. %A Malsy, A. K. %A Erel, E. %A Hauzenberger, C. %A Du Toit, G. %A Fallick, A. E. %A Ohnenstetter, D. %T Rubies and sapphires from winza, central Tanzania %D 2008 %L PAR00003290 %G ENG %J Gems and Gemology %@ 0016-626X %M ISI:000262661100003 %N 4 %P 322-347 %U https://www.documentation.ird.fr/hor/PAR00003290 %V 44 %W Horizon (IRD) %X Since late 2007, rubies and sapphires have been mined by hand methods from both eluvial and primary deposits at Winza in central Tanzania. The gem corundum is related to "dikes" of amphibolitic rocks that belong to the Paleoproterozoic Usagaran Belt. Based on crystal morphology, Winza corundum is subdivided into two types: prismatic-tabular-rhombohedral and dipyramidal. in general, medium red and dark (orangy) red top-quality rubies are rhombohedral. Pinkish red and purplish red rubies, as well as pink, purple, and blue (often strongly color zoned) sapphires are, for the most part, dipyramidal. The top-quality rubies are characterized by a distinct assemblage of long tube-, fiber-, needle-, or hair-like inclusions containing an orange-brown material (most likely limonite). The lower-quality material generally contains a larger amount of solid inclusions (mostly amphibole crystals), fissures, and growth features. Unique to corundum from this locality are bluish violet color zones oriented parallel to the prism and basal pinacoid, and occasionally also parallel to rhombohedral and dipyramidal faces. The relatively high Fe content of Winza rubies separates them from most other natural and almost all synthetic counterparts. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Ohnenstetter, D. %A Palhol, F. %A Feneyrol, J. %A Boutroy, E. %A Boissezon de, H. %A Lhomme, T. %T Karelianite and vanadian phlogopite from the merelani hills gem zoisite deposits, Tanzania %D 2008 %L fdi:010081639 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K karelianite ; vanadian phlogopite ; tanzanite ; graphitic gneiss ; Merelani ; Mozambique Belt ; Tanzania %M ISI:000261417400006 %N Part 5 %P 1183-1194 %R 10.3749/canmin.46.5.1183 %U https://www.documentation.ird.fr/hor/fdi:010081639 %> https://www.documentation.ird.fr/intranet/publi/depot/2021-03-11/010081639.pdf %V 46 %W Horizon (IRD) %X The Merelani deposits of gem-quality vanadian zoisite ("tanzanite") in Tanzania occur in Proterozoic vanadium-rich sedimentary series metamorphosed to the amphibolite facies. The gem-bearing assemblage consists of quartz, sulfides, graphite and "tanzanite" occurring in hydrothermal veins deposited in hydrothermally altered graphitic gneisses, marbles and calc-silicates. Two rare vanadian oxide and silicate minerals crystallize on the margins of pyrite and V-bearing pyrrhotite lenses, which are cross-cut by graphite-"tanzanite"-bearing quartz veins. Karelianite has a nearly pure end-member composition in the karelianite-eskolaite solid-solution series, with 93 to 96 wt% V2O3. Vanadian phlogopite closely associated with karelianite has high MgO (18.5 to 22.8 wt%), F (1.2 to 2.0 wt%) and TiO2 (up to 1.3 wt%). The V2O3 content varies between 4.2 and 10.9 wt%. The protolith of the host rock that contains the mineralization is a black shale; the hydrothermal graphite has a delta C-13 equal to-24.0%, which indicates a sedimentary source rich in organic matter. During hydrothermal alteration, V and Cr were scavenged by fluids from the graphitic gneisses, and fixed by the oxide and silicates. Textural evidence of dissolution of karelianite indicates that vanadium was remobilized by the hydrothermal fluid during the formation of late-stage vanadian zoisite ("tanzanite"), found in veinlets that cross-cut both sulfides and vanadium-bearing minerals. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Garnier, V. %A Giuliani, Gaston %A Ohnenstetter, D. %A Fallick, A. E. %A Dubessy, J. %A Banks, D. %A Vinh, H. Q. %A Lhomme, T. %A Maluski, H. %A Pecher, A. %A Bakhsh, K. A. %A Van Long, P. %A Trinh, P. T. %A Schwarz, D. %T Marble-hosted ruby deposits from Central and Southeast Asia : towards a new genetic model %D 2008 %L fdi:010044073 %G ENG %J Ore Geology Reviews %@ 0169-1368 %K Asia ; Ruby ; Marble ; Evaporite ; Metamorphism ; Geochemistry ; Stable isotopes ; Genetic model %M ISI:000259917500011 %N 1-2 Special Issue %P 169-191 %R 10.1016/j.oregeorev.2008.03.003 %U https://www.documentation.ird.fr/hor/fdi:010044073 %> https://www.documentation.ird.fr/intranet/publi/2008/11/010044073.pdf %V 34 %W Horizon (IRD) %X Marble-hosted ruby deposits represent the most important source of colored gemstones from Central and South East Asia. These deposits are located in the Himalayan mountain belt which developed during Tertiary collision of the Indian plate northward into the Eurasian plate. They are spatially related to granitoid intrusions and are contained in platform carbonates series that underwent high-grade meta morph ism. All occurrences are located close to major tectonic features formed during Himalayan orogenesis, directly in suture zones in the Himalayas, or in shear zones that guided extrusion of the Indochina block after the collision in South East Asia. Ar-Ar dating of micas syngenetic with ruby and U-Pb dating of zircon included in ruby gives evidence that these deposits formed during Himalayan orogenesis, and the ages document the extensional tectonics that were active, from Afghanistan to Vietnam, between the Oligocene and the Pliocene. The petrography shows that ruby-bearing marbles formed in the amphibolite facies (T=610 to 790 degrees C and P-6 kbar). A fluid inclusion Study defines the conditions of gem ruby formation during the retrograde metamorphic path (620 https://www.documentation.ird.fr/intranet/publi/2008/11/010044074.pdf %V 34 %W Horizon (IRD) %X Emerald, the green gem variety of beryl, is the third Most valuable gemstone (after diamond and ruby). Although it is difficult to Obtain accurate statistics, Colombia supplies most (an estimated 60%, worth more than $500,000,000 per year) of the world's emeralds. However there is speculation that the emerald mines in Colombia are becoming depleted. Brazil currently accounts for approximately 10% of world emerald production. Emeralds have also been mined in Afghanistan, Australia, Austria, Bulgaria, China, India, Madagascar, Namibia, Nigeria, Pakistan, South Africa, Spain, Tanzania, the United States, and Zimbabwe. Because it is difficult to obtain accurate analyses of beryllium, most published analyses of beryl are renormalized on the basis of 18 oxygen and 3 Be atoms per formula unit. The color of emerald is due to trace amounts of chromium and/or vanadium replacing aluminum at the Y site; in most cases the Cr content is much greater than that of V. To achieve charge balance, the Substitution of divalent cations at the Y site is coupled with the substitution of a monovalent cation for a vacancy at a channel site. Beryl is relatively rare because there is very little Be in the upper continental Crust. Unusual geologic and geochemical conditions are required for Be and Cr and/or V to meet. In the classic model, Be-bearing pegmatites interact with Cr-bearing ultramafic or mafic rocks. However in the Colombian deposits there is no evidence of magmatic activity and it has been demonstrated that circulation processes within the host black shales were sufficient to form emerald. In addition, researchers are recognizing that regional metamorphism and tectonometamorphic processes Such as shear zone formation may play a significant role in certain emerald deposits. A number of genetic classification schemes have been proposed for emerald deposits. Most are ambiguous when it comes to understanding the mechanisms and conditions that lead to the formation of an emerald deposit. Studies of individual emerald deposits show that in most cases a combination of mechanisms (magmatic, hydrothermal, and metamorphic) were needed to bring Be into contact with the chromophores. This Suggests the need for a more flexible classification scheme based on mode of formation. Stable isotopes can be used to estimate the contribution of each mechanism in the formation of a particular deposit. Such estimates could perhaps be more precisely defined using trace element data, which should reflect the mode of formation. Emerald may be identified in the field by color, hardness, and form. It will tend to Show LIP in stream sediment samples but because its specific gravity is relatively low, it will not concentrate in the heavy mineral fraction. In Colombia, structural geology, the sodium content of stream sediment samples, and the lithium. sodium, and lead contents of soil samples have all been used to find emerald occurrences. Exploration for gem beryl could result in the discovery of new occurrences of non-gem beryl or other Be minerals that Could become new sources of Be and Be oxide. Future efforts should go towards creating a comprehensive data base of emerald compositions (including trace elements), determination of the role of metamorphism in the formation of some emerald deposits, improved classification schemes, and more effective exploration guidelines. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Rakotondrazafy, A. F. M. %A Giuliani, Gaston %A Ohnenstetter, D. %A Fallick, A. E. %A Rakotosamizanany, S. %A Andriamamonjy, A. %A Ralantoarison, T. %A Razanatseheno, M. %A Offant, Y. %A Garnier, Virginie %A Maluski, H. %A Dunaigre, C. %A Schwarz, D. %A Ratrimo, V. %T Gem corundum deposits of Madagascar : a review %D 2008 %L fdi:010044075 %G ENG %J Ore Geology Reviews %@ 0169-1368 %K Madagascar ; Corundum deposits ; Magmatic ; Metamorphic ; Alkaline metasomatism ; Placers ; Sapphire ; Ruby %M ISI:000259917500009 %N 1-2 Special Issue %P 134-154 %R 10.1016/j.oregeorev.2007.05.001 %U https://www.documentation.ird.fr/hor/fdi:010044075 %> https://www.documentation.ird.fr/intranet/publi/2008/11/010044075.pdf %V 34 %W Horizon (IRD) %X Madagascar is one of the most important gem-producing countries in the world, including ruby and sapphires. Gem corundum deposits formed at different stages in the geological evolution of the island and in contrasting environments. Four main settings are identified: (I) Gem corundum formed in the Precambrian basement within the Neoproterozoic terranes of southern Madagascar. and in the volcano-sedimentary series of Beforona, north of Antananarivo. In the South, high-temperature (700 to 800 degrees C) and low-pressure (4 to 5 kbar) granulites contain deposits formed during the Pan-African orogenesis between 565 and 490 Ma. They accompany mafic and ultramafic complexes (ruby deposits of the Vohibory group), skarns at the contact between Anosyan granites and the Proterozoic Tranomaro group (sapphire deposits of the Tranomaro-Andranondambo district), and shear-zone corridors cross-cutting feldspathic gneisses, cordieritites and clinopyroxenites in the Tranomaro, Vohimena and Androyan metamorphic series (biotite schist deposits of Sahambano and Zazafotsy, cordieritites of lankaroka and Ambatomena). The circulation of fluids, especially along discontinuities, allowed in-situ alkaline metasomatism, forming corundum host rocks related to desilicified granites, biotitites, "sakenites" and "corundumites". (2) Gem corundum also occurs in the Triassic detrital formations of the Isalo group, as giant palaeoplacers in the Ilakaka-Sakaraha area. Here, sapphires and rubies may come from the metamorphic granulitic terranes of southern Madagascar. (3) Gem Corundum deposits occur within the Neogene-Quaternary alkali basalts from Ankaratra (Antsirabe-Antanifotsy area) and in the Ambohitra Province (Nosy Be, Ambato and Ambondromifehy districts). Primary deposits are rare, except at Soamiakatra where ruby in gabbroic and clinopyroxenite xenoliths within alkali-basalts probably derive from mantle garnet peridotites. The blue-green-yellow sapphires typical of basaltic fields are always recovered in palaeoplacer (in karst formed Upon Jurassic limestones from the Montagne d'Ambre, Antsiranana Province) and alluvial and soil placers (Ankaratra volcanic massif). (4) Deposits Occur within Quaternary eluvial, colluvial and alluvial concentrations, such as high-quality rubies from the Andilamena and Vatomandry deposits. %$ 064 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Ohnenstetter, D. %A Rakotondrazafy, A.M.M. %A Fallick, A.E. %A Rakotosamizanany, S. %A Andriamamonjy, A. %A Ralantoarison, T. %A Razanatseheno, M. %A Dunaigre, C. %A Schwarz, D. %T Les gisements de corindons gemmes de Madagascar %D 2007 %L fdi:010044801 %G FRE %J Revue de Gemmologie %K MINERAL ; GISEMENT ENDOGENE ; METAMORPHISME ; MAGMATISME ; OROGENESE %K CORINDON ; SAPHIR ; RUBIS %K MADAGASCAR %K AMBOHITRANEFITRA ; ANJOMAKELY ; SOAMIAKATRA ; SAHAMBANO ; ZAZAFOTSY ; IANKAROKA ; BETROKA ; AMBATOMENA ; VOHIBORY ; TRANOMARO ; ANTSIRANANA ; VATOMANDRY ; ANDILAMENA ; ILAKAKA %N 158 %P 14-28 %U https://www.documentation.ird.fr/hor/fdi:010044801 %> https://www.documentation.ird.fr/intranet/publi/depot/2009-02-11/010044801.pdf %W Horizon (IRD) %$ 064GEOCHI01 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Fallick, Anthony %A Rakotondrazafy, Michel %A Ohnenstetter, Daniel %A Andriamamonjy, Alfred %A Ralantoarison, Theogene %A Rakotosamizanany, Saholy %A Razanatseheno, Marie %A Offant, Yohann %A Garnier, Virginie %A Dunaigre, Christian %A Schwarz, Dietmar %A Mercier, Alain %A Ratrimo, Voahangy %A Ralison, Bruno %T Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin %D 2007 %L PAR00005436 %G ENG %J Mineralium Deposita %@ 0026-4598 %M ISI:000244029000004 %N 3 %P 251-270 %U https://www.documentation.ird.fr/hor/PAR00005436 %V 42 %W Horizon (IRD) %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Turner, David %A Groat, Lee A. %A Hart, Craig J. R. %A Mortensen, James K. %A Linnen, Robert L. %A Giuliani, Gaston %A Wengzynowski, William %T Mineralogical and geochemical study of the true blue aquamarine showing, southern Yukon %D 2007 %L PAR00005529 %G ENG %J Canadian Mineralogist %@ 0008-4476 %M ISI:000246693200002 %P 203-227 %U https://www.documentation.ird.fr/hor/PAR00005529 %V 45 %W Horizon (IRD) %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Rakotondrazafy, M. A. F. %A Nédélec, A. %A Giuliani, Gaston %T Incipient charnockitisation triggered by structurally-controlled CO2 influx in central Madagascar and magnetic implications %D 2007 %L fdi:010040748 %G ENG %J Gondwana Research %@ 1342-937X %M CC:0002474377-0014 %N 4 %P 584-585 %R 10.1016/j.gr.2006.11.006 %U https://www.documentation.ird.fr/hor/fdi:010040748 %> https://www.documentation.ird.fr/intranet/publi/2007/10/010040748.pdf %V 11 %W Horizon (IRD) %$ 064 %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %A Ohnenstetter, D. %A Garnier, V. %A Fallick, A.E. %A Rakotondrazafy, M. %A Schwarz, D. %A Fallick, A.E. %A Rakotosamizanany, S. %A Andriamamonjy, A. %A Ralantoarison, T. %A Razanatseheno, M. %A Dunaigre, C. %A Schwarz, D. %T The geology and genesis of gem corundum deposits %B Geology of gem deposits %C Yellowknife %D 2007 %E Raeside, E.R. %L fdi:010044802 %G ENG %I Mineralogical Association of Canada %K MINERAL ; GISEMENT ENDOGENE ; METALLOGENIE ; HISTOIRE ; REPARTITION GEOGRAPHIQUE ; EXPLOITATION ECONOMIQUE ; MINERALOGIE ; GEOCHIMIE ; MAGMATISME %K CORINDON ; RUBIS %K MONDE %N 37 %P 23-78 %U https://www.documentation.ird.fr/hor/fdi:010044802 %> https://www.documentation.ird.fr/intranet/publi/depot/2009-02-11/010044802.pdf %W Horizon (IRD) %S Short Course Series %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Ralantoarison, T. %A Andriamamonjy, A. %A Offant, Y. %A Giuliani, Gaston %A Rakotondrazafy, A.M.M. %A Ohnenstetter, D. %A Schwarz, D. %A Dunaigre, C. %A Fallick, A. %A Razanatseheno, M. %A Rakotosamizanany, S. %A Moine, B. %A Baillot, P. %T Les saphirs multicolores de Sahambano et Zazafotsy, région granulitique d'Ihosy, Madagascar %D 2006 %L fdi:010044800 %G FRE %J Revue de Gemmologie %K MINERAL ; GISEMENT ENDOGENE ; METAMORPHISME ; OROGENESE ; COMPOSITION CHIMIQUE ; GNEISS ; FER ; COULEUR %K SAPHIR ; CORINDON %K MADAGASCAR %K ILHOSY ; SAHAMBANO ; ZAZAFOTSY %N 158 %P 4-13 %U https://www.documentation.ird.fr/hor/fdi:010044800 %> https://www.documentation.ird.fr/intranet/publi/depot/2009-02-11/010044800.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Garnier, V. %A Maluski, H. %A Giuliani, Gaston %A Ohnenstetter, D. %A Schwarz, D. %T Ar-Ar and U-Pb ages of marble-hosted ruby deposits from central and southeast Asia %D 2006 %L fdi:010044799 %G ENG %J Canadian Journal of Earth Sciences %K MINERAL ; GISEMENT ENDOGENE ; DATATION ; ISOTOPE RADIOACTIF ; METAMORPHISME ; EXTENSION TECTONIQUE ; OROGENESE %K RUBIS ; MARBRE %K HIMALAYA ; AFGHANISTAN ; PAKISTAN ; MYANMAR ; VIET NAM ; CACHEMIRE %K JEGDALEK ; HUNZA VALLEE ; MOGOK ; YEN BAI %M ISI:000238817300008 %P 509-532 %R 10.1139/E06-005 %U https://www.documentation.ird.fr/hor/fdi:010044799 %> https://www.documentation.ird.fr/intranet/publi/depot/2009-02-11/010044799.pdf %V 43 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Giuliani, Gaston %A Fallick, A.E. %A Garnier, V. %A France-Lanord, C. %A Ohnenstetter, D. %A Schwarz, D. %T Oxygen isotope composition as a tracer for the origins of rubies and sapphires %D 2005 %L fdi:010034376 %G ENG %J Geology %@ 0091-7613 %K GITOLOGIE ; GISEMENT ENDOGENE ; PLACER ; MINERALISATION ; METHODE D'ANALYSE ; ANALYSE ISOTOPIQUE ; OXYGENE %K SAPHIR ; CORINDON %K MONDE %M ISI:000228127100003 %N 4 %P 249-252 %R 10.1130/G21261.1 %U https://www.documentation.ird.fr/hor/fdi:010034376 %V 33 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Garnier, V. %A Ohnenstetter, D. %A Giuliani, G. %A Fallick, A. E. %A Trong, T. P. %A Quang, V. H. %A Van, L. P. %A Schwarz, D. %T Basalt petrology, zircon ages and sapphire genesis from Dak Nong, southern Vietnam %D 2005 %L PAR00000156 %G ENG %J Mineralogical Magazine %@ 0026-461X %K sapphire ; basalt ; petrography ; geochemistry ; zircon ; U Pb dating by SIMS ; oxygen isotopes ; Vietnam %M CC:0002279127-0002 %N 1 %P 21-38 %R 10.1180/0026461056910233 %U https://www.documentation.ird.fr/hor/PAR00000156 %V 69 %W Horizon (IRD) %X Basalts associated with sapphire deposits are widespread in Europe, Africa, Asia and Australia. In Vietnam, blue, green and yellow sapphires are recovered from eluvial and alluvial placers hosted in basaltic fields of the Dak Lak Province. Two distinct basalt suites are recognized in this field: a tholeiitic suite without any xenocrysts and an alkaline suite with mantle and lower crustal xenocrysts. The sapphires are enriched in Fe (0.43 to 1.26 wt.%), with moderate contents of Cr (33-1582 ppm), Ti (35-1080 ppm), Ga (149-308 ppm) and V (28-438 ppm) and they are poor in Zn and Mg. Their O-isotope compositions range from 6.0 to 6.9 parts per thousand and are not in equilibrium with the alkali basalts which have delta(18)O values between 5.0 and 5.7 parts per thousand. The U-Pb dating of zircons recovered from the basaltic placers provides evidence of two eruptional events: one at similar to 6.5 Ma followed by another one at similar to 1 Ma. The petrography of the basalts and the oxygen isotopic composition of the sapphires suggest that the sapphires are xenocrysts and that they crystallized in a deep magma chamber, at the lower continental lithosphere and the upper mantle boundary, in evolved melts issued from the fractionation of alkali basaltic magmas contaminated with lower crustal fluids. %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Garnier, V. %A Ohnenstetter, D. %A Giuliani, G. %A Maluski, H. %A Deloule, E. %A Trong, T. P. %A Van, L. P. %A Quang, V. H. %T Age and significance of ruby-bearing marble from the Red River Shear Zone, northern Vietnam %D 2005 %L PAR00000645 %G ENG %J Canadian Mineralogist %@ 0008-4476 %K ruby deposits ; marble ; zircon ; in situ U Pb dating ; Cenozoic ages ; ion probe data ; electron microprobe data ; cathodoluminescence ; northern Vietnam %M CC:0002337944-0014 %N Part 4 %P 1315-1329 %R 10.2113/gscanmin.43.4.1315 %U https://www.documentation.ird.fr/hor/PAR00000645 %V 43 %W Horizon (IRD) %X Marble-hosted ruby deposits occur in the Lo Gam tectonic zone along the northeastern flank of the Day Nui Con Voi Range in the Red River Shear Zone, in the northern part of Vietnam. Crystals of zircon included in ruby and spinel from Luc Yen and An Phu deposits were dated in situ by the U-Pb method with an ion microprobe. The patchy zoning of the zircon crystals and the wide range of ages (266-38 Ma) provide evidence for a complex metamorphic history, with at least two main thermal events: (1) Zircon included in spinel crystals probably crystallized during the Permian (256.6 +/- 9.4 Ma), with a possible reopening of their U-Pb system in the early Triassic (231.7 +/- 5.6 Ma). (2) Ruby formed at about 38 Ma when the Red River Shear Zone was the site of ductile deformation during the peak of metamorphism. The dating of zircon and phlogopite syngenetic with ruby documents the temporal relationship between high-temperature metamorphism and the cooling history of the Red River metamorphic belt. Ruby deposits hosted by marble sequences, in central and southeastern Asia seem to be an excellent marker; they allow an interpretation of the timing of the activity of Cenozoic structures linked to the collision between Indian and Eurasian continents. %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Garnier, V. %A Ohnenstetter, D. %A Giuliani, Gaston %T L'aspidolite fluorée : rôle des évaporites dans la genèse du rubis des marbres de Nangimali (Azad-Kashmir, Pakistan) %D 2004 %L fdi:010034378 %G FRE %J Comptes Rendus Géoscience %@ 1631-0713 %K MINERAL ; GITOLOGIE ; GISEMENT ENDOGENE ; ANALYSE MINERALOGIQUE ; EVAPORITE %K CORINDON ; MARBRE %K PAKISTAN ; CACHEMIRE %K NANGIMALI ; NANGA PARBAT MASSIF ; NEELUM VALLEE %P 1245-1253 %R 10.1016/j.crte.2004.06.008 %U https://www.documentation.ird.fr/hor/fdi:010034378 %> https://www.documentation.ird.fr/intranet/publi/depot/0001/010034378.pdf %V 336 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Pham Van Long %A Hoang Quang Vinh %A Garnier, V. %A Giuliani, Gaston %A Ohnenstetter, D. %T Marble-hosted ruby from Vietnam %D 2004 %L fdi:010034441 %G ENG %J Canadian Gemmologist %@ 0000 %K MINERALOGIE ; GITOLOGIE ; ROCHE ENCAISSANTE ; ROCHE METAMORPHIQUE ; CRISTALLOGRAPHIE ; ANALYSE CHIMIQUE %K CORINDON ; MARBRE %K VIET NAM %K YEN BAI ; LUC YEN MINE ; NGHE AN ; QUY CHAN MINE %N 3 %P 83-95 %U https://www.documentation.ird.fr/hor/fdi:010034441 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010034441.pdf %V 25 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Pham Van Long %A Giuliani, Gaston %A Garnier, V. %A Ohnenstetter, D. %T Gemstones in Vietnam : a review %D 2004 %L fdi:010034442 %G ENG %J Australian Gemmologist %@ 0004-9174 %K MINERALOGIE ; GITOLOGIE ; GISEMENT ENDOGENE ; REPARTITION GEOGRAPHIQUE ; ROCHE METAMORPHIQUE ; ROCHE ENCAISSANTE ; MINERALISATION %K CORINDON ; SAPHIR %K VIET NAM %K YEN BAI ; TAN HUONG MINE ; TRUC LAU MINE ; BAC KAN ; QUY CHAU MINE ; DAK NONG ; MA LAM ; DA BAN ; XUAN LE ; THACH KHOAN %P 162-168 %U https://www.documentation.ird.fr/hor/fdi:010034442 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010034442.pdf %V 22 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Garnier, V. %A Giuliani, Gaston %A Ohnenstetter, D. %A Schwartz, D. %T Les gisements de corindon : classification et génèse %D 2004 %L fdi:010037123 %G FRE %J Le Règne Minéral %@ 1259-4415 %K MINERALOGIE ; EXPLOITATION DES RESSOURCES NATURELLES ; METAMORPHISME ; MAGMATISME ; METASOMATISME ; TECTONIQUE DE PLAQUES ; GENESE ; CLASSIFICATION %K GISEMENT PRIMAIRE ; RUBIS ; SAPHIR ; CORINDON %K VIET NAM ; THAILANDE ; CAMBODGE ; SRI LANKA ; MADAGASCAR ; MYANMAR %N 55 %P 7-35 %U https://www.documentation.ird.fr/hor/fdi:010037123 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-10/010037123.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Garnier, V. %A Giuliani, Gaston %A Ohnenstetter, D. %A Schwarz, D. %T Les placers à corindon gemme %D 2004 %L fdi:010037124 %G FRE %J Le Règne Minéral %@ 1259-4415 %K MINERALOGIE ; GISEMENT ALLUVIONNAIRE ; GEOCHIMIE ; GENESE ; EXPLOITATION DES RESSOURCES NATURELLES ; PLACER %K RUBIS ; GEMME ; CORINDON %K VIET NAM ; MADAGASCAR ; AUSTRALIE ; TANZANIE %N 55 %P 36-47 %U https://www.documentation.ird.fr/hor/fdi:010037124 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-10/010037124.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Lemarchand, F. %A Giuliani, Gaston %A Ohnenstetter, D. %T Le sel des rubis %D 2004 %L fdi:010037125 %G FRE %J La Recherche %@ 0029-5671 %K MINERALOGIE ; EXPLOITATION DES RESSOURCES NATURELLES ; GEOCHIMIE ; GENESE %K RUBIS ; GEMME %K MYANMAR %K MOGOK VALLEE %N 379 %P 80-87 %U https://www.documentation.ird.fr/hor/fdi:010037125 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-10/010037125.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES %A Garnier, V. %A Ohnenstetter, D. %A Giuliani, G. %T Fluor-rich aspidolite: a witness of evaporite implication in the genesis of ruby Nangimali (Azad-Kashmir, Pakistan) marbles %D 2004 %L PAR00000023 %G ENG %J Comptes Rendus Geoscience %@ 1631-0713 %K aspidolite (sodium phlogopite) ; phlogopite ; paragonite ; phengite ; evaporites ; ruby-bearing marble ; Nangimali ; Pakistan %M CC:0002255139-0003 %N 14 %P 1245-1253 %R 10.1016/j.crte.2004.06.008 %U https://www.documentation.ird.fr/hor/PAR00000023 %V 336 %W Horizon (IRD) %X Dans les marbres à rubis de Nangimali, dans l'Azad-Kashmir au Pakistan, on a découvert des intercroissances de plusieurs micas : aspidolite (phlogopite sodique), de phlogopite et de paragonite. Les deux phlogopites, intimement liées et coexistant avec la paragonite, sont enrichies en fluor, contrairement aux phengites et paragonites. L'aspidolite enrichie en fluor est décrite pour la première fois. La phengite peut être, soit associée à la phlogopite, soit isolée. La présence d'aspidolite dans les marbres à rubis, ainsi que d'autres arguments comme les inclusions solides à sels et la présence d'anhydrite, suggèrent l'implication d'évaporites pour la genèse des corindons gemmes. %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Marshall, D. %A Groat, L. %A Giuliani, Gaston %A Murphy, D. %A Mattey, D. %A Ercit, T.S. %A Wise, M.A. %A Wengzynowski, W. %A Eaton, D.W. %T Pressure, temperature and fluid conditions during emerald precipitation, southeastern Yukon, Canada : fluid inclusion and stable isotope evidence %D 2003 %L fdi:010034375 %G ENG %J Chemical Geology %@ 0009-2541 %K MINERALISATION ; BERYLIUM ; GISEMENT ENDOGENE ; ALTERATION HYDROTHERMALE ; PRECIPITATION ; ANALYSE ISOTOPIQUE ; COMPOSITION CHIMIQUE %K EMERAUDE %K CANADA ; YUKON TERRITORY %P 187-199 %R 10.1016/S0009-2541(02)00277-2 %U https://www.documentation.ird.fr/hor/fdi:010034375 %V 194 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Dubessy, J. %A Banks, D. %A Hoang Quang Vinh %A Lhomme, T. %A Pironon, J. %A Garnier, V. %A Phan Trong Trinh %A Pham Van Long %A Ohnenstetter, D. %A Schwarz, D. %T CO2-H2S-COS-S8-A1O(OH)-bearing fluid inclusions in ruby from marble-hosted deposits in Luc Yen area, North Vietnam %D 2003 %L fdi:010034380 %G ENG %J Chemical Geology %@ 0009-2541 %K GITOLOGIE ; MINERALISATION ; ROCHE METAMORPHIQUE ; ROCHE ENCAISSANTE ; EVAPORITE ; ANALYSE MINERALOGIQUE ; ANALYSE CHIMIQUE ; SPECTROSCOPIE %K CORINDON ; MARBRE %K VIET NAM %K LUC YEN ; LO GAM REGION ; BAI DA LAN MINE ; AN PHU MINE ; MINH TIEN MINE ; KHOAN THONG MINE %P 167-185 %R 10.1016/S0009-2541(02)00276-0 %U https://www.documentation.ird.fr/hor/fdi:010034380 %V 194 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Fritsch, Emmanuel %A Chalain, J.P. %A Hänni, H. %A Devouard, B. %A Chazot, G. %A Giuliani, Gaston %A Schwartz, D. %A Rollion-Bard, C. %A Garnier, V. %A Barda, S. %A Ohnenstetter, D. %A Notari, F. %A Maitrallet, P. %T Le nouveau traitement produisant des couleurs orange à jaune dans les saphirs %D 2003 %L fdi:010034444 %G FRE %J Revue de Gemmologie %@ 0398-9011 %K MINERAL ; COULEUR ; TECHNIQUE DE FABRICATION ; BERYLIUM ; ANALYSE CHIMIQUE ; SPECTROSCOPIE %K SAPHIR %K MADAGASCAR ; TANZANIE %N 147 %P 11-23 %U https://www.documentation.ird.fr/hor/fdi:010034444 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010034444.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Garnier, V. %A Trong Trinh, P. %A Deloule, E. %A Giuliani, Gaston %A Ohnenstetter, D. %A Van Long, P. %A Quand Vinh, H. %T Xac dinh tuoi zircon trong bao the rubi va spinel vung Luc Yen bang phuong phap uran - chi %D 2003 %L fdi:010034448 %G VIE %J Tap Chi Cac Khoa Hoc Ve Trai Dat %@ 0886-7187 %K MINERALOGIE ; DATATION ; URANIUM ; PLOMB ; ANALYSE ISOTOPIQUE ; MINERALISATION ; METAMORPHISME ; TECTONIQUE %K CORINDON ; SPINELLE ; ZIRCON %K VIET NAM %K LUC YEN ; LO GAM %N 1 %P 22-26 %U https://www.documentation.ird.fr/hor/fdi:010034448 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010034448.pdf %V 25 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Rondeau, B. %A Notari, F. %A Giuliani, Gaston %A Michelou, JC. %A Martins S. %A Fritsch, Emmanuel %A Respinger, A. %T La Mine de Piteiras, Minas Gerais, nouvelle source d'émeraude de belle qualité au Brésil %D 2003 %L fdi:010037114 %G FRE %J Revue de Gemmologie %@ 0398-9011 %K MINERALISATION ; EXPLOITATION DES RESSOURCES NATURELLES ; GEOCHIMIE ; ISOTOPE ; SPECTROMETRIE %K EMERAUDE ; GEMME %K BRESIL SUDESTE ; MINAS GERAIS %K PITEIRAS MINE %N 148 %P 9-25 %U https://www.documentation.ird.fr/hor/fdi:010037114 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-10/010037114.pdf %W Horizon (IRD) %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %T Des escargots fossiles en émeraude %B Encylopédie universalis %C Paris %D 2003 %E 2Encyclopedia Universalis/4Paris/5FRA %L fdi:010034019 %G FRE %I Encyclopedia Universalis %K GITOLOGIE ; MINERALISATION ; FOSSILE ; SEDIMENT ; DISSOLUTION %K COQUILLE ; EMERAUDE %K COLOMBIE %K GALACHA REGION %P 1 %U https://www.documentation.ird.fr/hor/fdi:010034019 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010034019.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Garnier, V. %A Ohnenstetter, D. %A Giuliani, Gaston %A Schwarz, D. %T Rubis trapiches de Mong Hsu, Myanmar %D 2002 %L fdi:010034372 %G FRE %J Revue de Gemmologie %@ 0398-9011 %K MINERAL ; GITOLOGIE ; CRISTALLOGRAPHIE ; CROISSANCE CRISTALLINE ; TEXTURE ; COMPOSITION CHIMIQUE ; SPECTROMETRIE ; MICROSCOPIE ELECTRONIQUE A BALAYAGE %K CORINDON %K ASIE DU SUD EST ; MYANMAR %K MONG HSU %N 144 %P 5-12 %U https://www.documentation.ird.fr/hor/fdi:010034372 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010034372.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Groat, L.A. %A Marshall, D.D. %A Giuliani, Gaston %A Murphy, D.C. %A Piercey, S.J. %A Lambor, J.L. %A Mortensen, J.K. %A Ercit, T.S. %A Gault, R.A. %A Mattey, D.P. %A Schwarz, D. %A Maluski, H. %A Wise, M.A. %A Wengzynowski, W. %A Eaton, D.W. %T Mineralogical and geochemical study of the regal ridge emerald showing, southeastern Yukon %D 2002 %L fdi:010034373 %G ENG %J Canadian Mineralogist %K MINERAL ; BERYLIUM ; GISEMENT ENDOGENE ; MINERALISATION ; CRISTALLOGRAPHIE ; COMPOSITION CHIMIQUE ; COMPOSITION MINERALOGIQUE ; ANALYSE ISOTOPIQUE ; OXYGENE ; GEOCHRONOLOGIE %K CANADA ; YUKON TERRITORY %K FINLAYSON LAC %P 1313-1338 %R 10.2113/gscanmin.40.5.1313 %U https://www.documentation.ird.fr/hor/fdi:010034373 %V 40 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Pêcher, A. %A Giuliani, Gaston %A Garnier, V. %A Maluski, H. %A Kausar, A.B. %A Malik, R.H. %A Muntaz, H.R. %T Geology, geochemistry and Ar-Ar geochronology of the Nangimali ruby deposit, Nanga Parbat Himalaya (Azad Kashmir, Pakistan) %D 2002 %L fdi:010034374 %G ENG %J Journal of Asian Earth Sciences %@ 1367-9120 %K MINERALOGIE ; GITOLOGIE ; ROCHE METAMORPHIQUE ; ROCHE ENCAISSANTE ; GEOCHIMIE ; ELEMENT CHIMIQUE MAJEUR ; ELEMENT EN TRACE ; ANALYSE ISOTOPIQUE ; CARBONE ; OXYGENE ; GEOCHRONOLOGIE %K CORINDON %K PAKISTAN ; CACHEMIRE %K HIMALAYA ; NANGIMALI ; NEELUM VALLEY ; SHONTAR GALI ; NANGA PARBAT %P 265-282 %R 10.1016/S1367-9120(02)00041-X %U https://www.documentation.ird.fr/hor/fdi:010034374 %V 21 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Garnier, V. %A Ohnenstetter, D. %A Giuliani, Gaston %A Blanc, P. %A Schwartz, D. %T Trace-elements contents and cathodoluminescence of "trapiche" rubies from Mong Hsu, Myanmar (Burma) : geological significance %D 2002 %L fdi:010034446 %G ENG %J Mineralogy and Petrology %@ 0000 %K MINERAL ; ANALYSE CHIMIQUE ; ANALYSE MINERALOGIQUE ; ELEMENT EN TRACE ; MICROSCOPIE ELECTRONIQUE A BALAYAGE ; LUMINESCENCE ; SPECTROMETRIE %K CORINDON %K MYANMAR %K MONG HSU %P 179-193 %R 10.1007/s007100200040 %U https://www.documentation.ird.fr/hor/fdi:010034446 %V 76 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Banquet, Y. %A Cheilletz, A. %A Cobbold, P. R. %A Baby, Patrice %A Laumonier, B. %A Giuliani, Gaston %T Andean deformation and rift inversion, eastern edge of Cordillera Oriental (Guateque-Medina area), Colombia %D 2002 %L fdi:010029760 %G ENG %J Journal of South American Earth Sciences %@ 0895-9811 %K GEOLOGIE STRUCTURALE ; OROGENESE ; COMPRESSION TECTONIQUE ; RIFT ; FAILLE ; STRATIGRAPHIE %K COLOMBIE %K ANDES ; GUATEQUE ; MEDINA %N 4 %P 391-407 %R 10.1016/S0895-9811(02)00063-9 %U https://www.documentation.ird.fr/hor/fdi:010029760 %V 15 %W Horizon (IRD) %$ 064TECTO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Garnier, V. %A Giuliani, Gaston %A Maluski, H. %A Ohnenstetter, D. %A Trin Phan Trong %A Ving Hoang Quang %A Long Pham Van %A Tich Vu Van %A Schwartz, D. %T Ar-Ar ages in phlogopites from marble-hosted ruby deposits in northern Vietnam : evidence for cenozoic ruby formation %D 2002 %L fdi:010029764 %G ENG %J Chemical Geology %@ 0009-2541 %K MINERAL ; GISEMENT ENDOGENE ; MINERALISATION ; MINE ; GEOCHIMIE ; TECTONIQUE ; METAMORPHISME ; DATATION ; ANALYSE ISOTOPIQUE ; CENOZOIQUE %K VIET NAM %K YEN BAI ; VINH %N 1-2 %P 33-49 %R 10.1016/S0009-2541(02)00063-3 %U https://www.documentation.ird.fr/hor/fdi:010029764 %V 188 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Vuillet, P. %A Giuliani, Gaston %A Fisher, J.C. %A Chiappero, P.J. %T Les émeraudes de Gachala, Colombie : historique, genèse et découverte paléontologiques %D 2002 %L fdi:010029768 %G FRE %J Le Règne Minéral %K MINERAL ; BERYLIUM ; MINE ; GENESE ; MINERALISATION ; GEOCHIMIE ; PALEONTOLOGIE ; FOSSILE ; HISTOIRE %K COLOMBIE %K GACHALA %N 46 %P 5-17 %U https://www.documentation.ird.fr/hor/fdi:010029768 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers07/010029768.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Branquet, Y. %A Cheilletz, A. %A Cobbold, R.P. %A Baby, Patrice %A Laumonier, B. %A Giuliani, Gaston %T Andean deformation and rift inversion, eastern edge of Cordillera Oriental (Guateque-Medina area), Colombia. %D 2002 %L PAR00002996 %G ENG %J Journal of South American Earth Sciences %K Andean deformation ; Rift inversion ; Colombia ; Cordillera Oriental ; Guateque-Medina are %K COLOMBIE ; ANDES %M HAL:hal-00076871 %N 4 %P 391-407 %R 10.1016/S0895-9811(02)00063-9 %U https://www.documentation.ird.fr/hor/PAR00002996 %V 15 %W Horizon (IRD) %X In the Guateque-Medina area, Paleozoic basement and Mesozoic rift basins have been uplifted and exhumed during the Andean orogeny (12 Ma to present). Surface exposures and subsurface data constrain the deformation style and the rift geometry. We have mapped a regional transect and restored a cross section. We have also reconciled existing stratigraphic data, from cordillera, foothills and foreland basin, and have added new data of our own. In Early Cretaceous shales, there is evidence for fault-controlled sedimentation. A brecciated evaporitic layer, which is locally emerald bearing, has acted as a regional detachment. The underlying basement, composed of Paleozoic sediments, crops out as the Quetame Massif. It was uplifted during the Andean orogeny on a series of high-angle reverse faults. The main SE-verging Tesalia fault has resulted from Andean reactivation of an Early Cretaceous normal fault, which bounded a half-rift. A series of NW-verging back-thrusts may have resulted from Andean reactivation of Paleozoic faults. Between the back-thrusts and the Tesalia fault is a basement pop-up. It may be part of a flower structure, because components of right-lateral slip have been identified. These are attributed to eastward subduction of the Nazca plate beneath South America. In general, the style and timing of Andean deformation in the Guateque-Medina area are compatible with the plate tectonic setting of the northern Andes. %$ 064 %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %T Emerald %B McGraw-Hill yearbook of science and technology : comprehensive coverage of recent events and research %C New York %D 2002 %L fdi:010029769 %G ENG %I McGraw-Hill %K MINERAL ; BERYLIUM ; MINERALISATION ; GISEMENT ENDOGENE ; ISOTOPE ; OXYGENE ; ORIGINE GEOGRAPHIQUE ; HISTOIRE %K ZAMBIE ; BRESIL ; RUSSIE ; MADAGASCAR ; ZIMBABWE ; PAKISTAN ; AFGHANISTAN %P 92-94 %U https://www.documentation.ird.fr/hor/fdi:010029769 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-05/010029769.pdf %W Horizon (IRD) %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Schwarz, D. %A Giuliani, Gaston %A Grundmann, G. %A Glas, M. %T The origin of emerald : a controversial topic %B Emerald : the most valuable beryl : the most precious gemstone %C East Hampton %D 2002 %E Giuliani, Gaston %E Jarnot, M. %E Neumeier, G. %E Ottaway, T. %E Sinkankas, J. %E Staebler, G. %E Petrov, A. %E Neumeier, G. %L fdi:010030126 %G ENG %I Lapis International %@ 0-971-5371-1-9 %K PETROGRAPHIE ; MINERAL ; BERYLIUM ; GITOLOGIE ; MINERALISATION ; ROCHE HOTE ; GISEMENT ENDOGENE ; CLASSIFICATION %K NIGERIA ; RUSSIE ; AUTRICHE ; PAKISTAN ; COLOMBIE ; BRESIL %N 2 %P 18-23 %U https://www.documentation.ird.fr/hor/fdi:010030126 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-03/010030126.pdf %W Horizon (IRD) %S Extra Lapis English %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Grundmann, G. %A Giuliani, Gaston %T Emeralds of the world : notes on known emerald occurrences %B Emerald : the most valuable beryl : the most precious gemstone %C East Hampton %D 2002 %E Giuliani, Gaston %E Jarnot, M. %E Neumeier, G. %E Ottaway, T. %E Sinkankas, J. %E Staebler, G. %E Petrov, A. %E Neumeier, G. %L fdi:010030127 %G ENG %I Lapis International %@ 0-971-5371-1-9 %K PETROGRAPHIE ; MINERAL ; BERYLIUM ; ORIGINE GEOGRAPHIQUE ; ANALYSE QUANTITATIVE ; MINERALOGIE ; ROCHE HOTE %K MONDE %N 2 %P 24-35 %U https://www.documentation.ird.fr/hor/fdi:010030127 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-03/010030127.pdf %W Horizon (IRD) %S Extra Lapis English %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Schwarz, D. %A Giuliani, Gaston %T South America : Colombia : the western and eastern zones of the Eastern Cordillera : still number 1 in the world %B Emerald : the most valuable beryl : the most precious gemstone %C East Hampton %D 2002 %E Giuliani, Gaston %E Jarnot, M. %E Neumeier, G. %E Ottaway, T. %E Sinkankas, J. %E Staebler, G. %L fdi:010030128 %G ENG %I Lapis International %@ 0-971-5371-1-9 %K PETROGRAPHIE ; MINERAL ; BERYLIUM ; MINE ; REPARTITION GEOGRAPHIQUE ; HISTOIRE ECONOMIQUE ; GITOLOGIE %K COLOMBIE %N 2 %P 36-45 %U https://www.documentation.ird.fr/hor/fdi:010030128 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-03/010030128.pdf %W Horizon (IRD) %S Extra Lapis English %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Schwarz, D. %A Giuliani, Gaston %T South America : Brazil : Minas Gerais, Brazil's top producer along with Bahia, Ceara, Goias and Tocantius %B Emerald : the most valuable beryl : the most precious gemstone %C East Hampton %D 2002 %E Giuliani, Gaston %E Jarnot, M. %E Neumeier, G. %E Ottaway, T. %E Sinkankas, J. %E Staebler, G. %L fdi:010030129 %G ENG %I Lapis International %@ 0-971-5371-1-9 %K PETROGRAPHIE ; MINERAL ; BERYLIUM ; MINE ; REPARTITION GEOGRAPHIQUE %K BRESIL ; MINAS GERAIS ; BAHIA ; CEARA ; GOIAS ; TOCANTINS %N 2 %P 46-51 %U https://www.documentation.ird.fr/hor/fdi:010030129 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-03/010030129.pdf %W Horizon (IRD) %S Extra Lapis English %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Schwarz, D. %A Giuliani, Gaston %T Emeralds from Asia : Pakistan, Afghanistan and India : historically significant deposits %B Emerald : the most valuable beryl : the most precious gemstone %C East Hampton %D 2002 %E Giuliani, Gaston %E Jarnot, M. %E Neumeier, G. %E Ottaway,T. %E Sinkankas, J. %E Staebler, G. %L fdi:010030130 %G ENG %I Lapis International %@ 0-971-5371-1-9 %K PETROGRAPHIE ; MINERAL ; BERYLIUM ; MINE ; REPARTITION GEOGRAPHIQUE ; HISTOIRE ECONOMIQUE %K PAKISTAN ; AFGHANISTAN ; INDE %N 2 %P 60-63 %U https://www.documentation.ird.fr/hor/fdi:010030130 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-03/010030130.pdf %W Horizon (IRD) %S Extra Lapis English %$ 064PETRO %0 Edited Book %9 DO : Directions d'ouvrages ou de revues %A Giuliani, Gaston %A Jarnot, M. %A Neumeier, G. %A Ottaway, T. %A Sinkankas, J. %A Staebler, G. %A Petrov, A. %A Neumeier, G. %T Emerald : the most valuable beryl : the most precious gemstone %C East Hampton %D 2002 %L fdi:010030125 %G ENG %I Lapis International %@ 0-971-5371-1-9 %K PETROGRAPHIE ; MINERAL ; BERYLIUM ; GITOLOGIE ; MINE ; CRISTALLOGRAPHIE ; MINERALISATION ; GISEMENT ENDOGENE ; REPARTITION GEOGRAPHIQUE %K MONDE %N 2 %P 100 %U https://www.documentation.ird.fr/hor/fdi:010030125 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-03/010030125.pdf %W Horizon (IRD) %B Extra Lapis English %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Schwartz, D. %A Giuliani, Gaston %T Emerald deposits : a review %D 2001 %L fdi:010034445 %G ENG %J Australian Gemmologist %@ 0004-9174 %K GITOLOGIE ; MINERAL ; BERYLIUM ; MINERALISATION ; TYPOLOGIE ; ROCHE ENCAISSANTE ; GISEMENT ENDOGENE ; GEOCHIMIE %K MONDE %P 17-23 %U https://www.documentation.ird.fr/hor/fdi:010034445 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-12/010034445.pdf %V 21 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Alexandrov, P. %A Giuliani, Gaston %A Zimmermann, J.L. %T Mineralogy, age and fluid geochemistry of the rila emerald deposit, Bulgaria %D 2001 %L fdi:010029770 %G ENG %J Economic Geology %@ 0361-0128 %K MINERAL ; BERYLIUM ; GISEMENT ENDOGENE ; GEOCHIMIE ; MINERALISATION ; ALTERATION HYDROTHERMALE ; TALC ; SCHISTE ; DATATION ; ANALYSE ISOTOPIQUE %K BULGARIE %K RHODOPA ; RILA %P 1469-1476 %R 10.2113/96.6.1469 %U https://www.documentation.ird.fr/hor/fdi:010029770 %V 96 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Chaussidon, M. %A France-Lanord, C. %A Savay Guerraz, H. %A Chiappero, P.J. %A Schubnel, H.J. %A Gavrilenko, E. %A Schwarz, D. %T L'exploitation des mines d'émeraude d'Autriche et de la Haute-Egypte à l'époque gallo-romaine : mythe ou réalité ? %D 2001 %L fdi:010029774 %G FRE %J Revue de Gemmologie %@ 0398-9011 %K MINERAL ; BERYLIUM ; MINE ; HISTOIRE ; ANALYSE ISOTOPIQUE ; OXYGENE ; ORIGINE GEOGRAPHIQUE ; ARCHEOLOGIE HISTORIQUE %K AUTRICHE ; EGYPTE %N 143 %P 20-24 %U https://www.documentation.ird.fr/hor/fdi:010029774 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-05/010029774.pdf %W Horizon (IRD) %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Ferro de Oliveira Fortes, P. %A Gaspar, J.C. %A Coelho, R.F. %A Giuliani, Gaston %A Jost, H. %A Da Costa, C.N. %A De Moraes, R. %A Kuyumjian, R.D. %A Santos, R.V. %A Pimentel, M.M. %T Geologia das jazidas auriferas mina 3 e mina nova, Greenstone Belt de Crixas (GO) %B Caracterizacao de depositos auriferos em distritos mineiros brasileiros %C Brasilia (BRA) ; Brasilia %D 2001 %E 2Ministerio de Minas et Energia/4Brasilia/5BRA %E 1DNPM/2Departamento Nacional de Producao Mineral/4Brasilia/5BRA %E 1ADIMB/2Agencia para o Desenvolvimento Technologico da Industria Mineral Brasileira/4Brasilia/5BRA %L fdi:010029580 %G POR %I Ministerio de Minas e Energia ; DNPM %K METALLOGENIE ; OR ; MINE ; PETROGRAPHIE ; MINERALOGIE ; ANALYSE CHIMIQUE ; ELEMENT CHIMIQUE MAJEUR ; ELEMENT CHIMIQUE MINEUR ; GEOCHRONOLOGIE ; ANALYSE ISOTOPIQUE %K BRESIL %K CRIXAS %P 243-300 %U https://www.documentation.ird.fr/hor/fdi:010029580 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-05/010029580.pdf %W Horizon (IRD) %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Gavrilenko, E. %A Giuliani, Gaston %A Popov, M. %A France-Lanord, C. %T Emeralds of the Ural mountains (Russia) : geology, fluid inclusions and oxygen isotopes %S Proceedings of 28 international gemmological conference %C Madrid %D 2001 %E Sapalski, C. %L fdi:010038123 %G ENG %I IGC %K PETROGRAPHIE ; MINERALOGIE ; BERYLIUM ; GENESE ; ANALYSE ISOTOPIQUE ; OXYGENE %K RUSSIE %K OURAL ; EKATERINBOURG REGION %P 36-40 %U https://www.documentation.ird.fr/hor/fdi:010038123 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-10/010038123.pdf %W Horizon (IRD) %B International Gemmological Conference %8 2001/10/08-11 %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Banks, D.A. %A Giuliani, Gaston %A Yardley, B.W.D. %A Cheilletz, A. %T Emerald mineralisation in Colombia : fluid chemistry and the role of brine mixing %D 2000 %L fdi:010029773 %G ENG %J Mineralium Deposita %@ 0026-4598 %K MINERAL ; BERYLIUM ; GEOCHIMIE ; MINERALISATION ; ALTERATION HYDROTHERMALE ; METAMORPHISME %K COLOMBIE %P 699-713 %R 10.1007/s001260050273 %U https://www.documentation.ird.fr/hor/fdi:010029773 %V 35 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Chaussidon, M. %A Schubnel, H.J. %A Piat, D.H. %A Rollion-Bard, C. %A France-Lanord, C. %A Giard, D. %A Narvaez, D. de %A Rondeau, B. %T Oxygen isotopes and emerald trade routes since antiquity %D 2000 %L fdi:010020866 %G ENG %J Science %@ 0036-8075 %K MINERAL ; GITOLOGIE ; ANALYSE ISOTOPIQUE ; COMMERCE ; HISTOIRE ; EXPLOITATION DES RESSOURCES NATURELLES %K EMERAUDE %N 5453 %P 631-633 %R 10.1126/science.287.5453.631 %U https://www.documentation.ird.fr/hor/fdi:010020866 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_53-54/010020866.pdf %V 287 %W Horizon (IRD) %X Oxygen isotopic compositions of historical emerald artifacts from the Gallo-Roman period to the 18th century indicate that during historical times, artisans worked emeralds originating from deposits supposedly discovered in the 20th century. In antiquity, Pakistani and Egyptian emeralds were traded by way of the Silk Route. Together with Austrian stones, they were the only source of gem-quality emeralds. Immediately after the discovery of the Colombian mines by Spaniards in the 16th century, a new trade route was established, first via Spain to Europe and India and then directly via the Philippines to India. Since then, Colombian emeralds have dominated the emerald trade, and most of the high-quality emeralds cut in the 18th century in India originated from Colombia. (Résumé d'auteur) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Heuzé, M. %A Chaussidon, M. %T La route des émeraudes anciennes %D 2000 %L fdi:010023059 %G FRE %J Pour la Science %@ 0153-4092 %K GITOLOGIE ; MINERALOGIE ; PIERRE ; MINE ; HISTOIRE %K EMERAUDE %K AFGHANISTAN ; EGYPTE ; AUTRICHE %N 277 %P 58-65 %U https://www.documentation.ird.fr/hor/fdi:010023059 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_55-56/010023059.pdf %W Horizon (IRD) %$ 064GEOCHI ; 112HISTO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Chaussidon, M. %A France-Lanord, C. %A Rollion, C. %A Mangin, D. %A Coget, P. %T Application de l'analyse isotopique par spectrométrie de masse et sonde ionique de l'oxygène des émeraudes naturelles %D 1999 %L fdi:010059693 %G FRE %J Analusis %K MINERAL ; BERYLIUM ; METHODE D'ANALYSE ; ANALYSE ISOTOPIQUE ; OXYGENE ; SPECTROMETRIE ; ARCHEOLOGIE %K EMERAUDE ; GEMME %K MONDE %N 3 %P 203-206 %R 10.1051/analusis:1999270203 %U https://www.documentation.ird.fr/hor/fdi:010059693 %> https://www.documentation.ird.fr/intranet/publi/depot/2013-07-31/010059693.pdf %V 27 %W Horizon (IRD) %$ 064PETRO ; 112ARCHEO01 %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Bourlès, D. %A Massot, J. %A Siame, L. %T Colombian emerald reserves inferred leached beryllium of their host black shale %D 1999 %L fdi:010029847 %G ENG %J Exploration and Mining Geology %@ 0964-1823 %K MINE ; MINERAL ; BERYLIUM ; PETROGRAPHIE ; GITOLOGIE ; ALTERATION HYDROTHERMALE ; SCHISTE %K COLOMBIE %K CHIVOR MINE ; EL TORO MINE %N 1-2 %P 109-116 %U https://www.documentation.ird.fr/hor/fdi:010029847 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-05/010029847.pdf %V 8 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Branquet, Y. %A Laumonier, B. %A Cheilletz, A. %A Giuliani, Gaston %T Emeralds in the Eastern cordillera of Colombia : two tectonic settings for one mineralization %D 1999 %L fdi:010019064 %G ENG %J Geology %@ 0091-7613 %K MINERAI ; GISEMENT ENDOGENE ; GEOCHIMIE ; MINERALISATION ; EVAPORITE ; TECTONIQUE ; CRETACE ; TERTIAIRE ; EOCENE ; OLIGOCENE %K EMERAUDE %K COLOMBIE %N 7 %P 597-600 %R 10.1130/0091-7613(1999)027<0597:EITECO>2.3.CO;2 %U https://www.documentation.ird.fr/hor/fdi:010019064 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_51-52/010019064.pdf %V 27 %W Horizon (IRD) %X Colombian emeralds are formed through a hydrothermal-sedimentary process. On the western side of the Eastern Cordillera, the deposits are linked by tear faults and associated thrusts developed during a compressive tectonic phase that occurred at the time of the Eocene-Oligocene boundary, prior to the major uplift of the Cordillera during the Andean phase (middle Miocene). On the eastern side of the Cordillera, emerald mineralization occurred earlier, at the time of the Cretaceous-Teritary boundary, during a thin-skinned extensional tectonic event linked to evaporite dissolution. This event predates the Andean phase, during which this part of the chain was folded and thrust over the Llanos foreland. (Résumé d'auteur) %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Branquet, Y. %A Cheilletz, A. %A Cobbold, P.R. %A Baby, Patrice %A Laumonier, B. %A Giuliani, Gaston %T Andean transpressive tectonics at the eastern edge of the Cordillera Oriental, Colombia (Chivor-Guavio area) %S Géodynamique andine : résumés étendus = Andean geodynamics : extended abstracts = Geodinamica andina : resumenes expandidos %C Paris (FRA) ; Göttingen %D 1999 %L fdi:010022655 %G ENG %I IRD ; Georg August Universität %K TECTONIQUE ; COMPRESSION TECTONIQUE ; PROFIL SISMIQUE ; FACIES ; OROGENESE ; FAILLE ; ETUDE REGIONALE %K ANDES ; COLOMBIE %K CHIVOR GUAVIO ; QUETAME MASSIF %P 103-105 %U https://www.documentation.ird.fr/hor/fdi:010022655 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers09-03/010022655.pdf %W Horizon (IRD) %X Des études de terrain appuyées par l'interprétation de profiles sismiques nous ont permis de réaliser une coupe du bord Est de la Cordillère Orientale de Colombie intégrant le massif de Quetame et la zone subandine des foothills du Guavio. Cette étude met en évidence l'importance du régime transpressif lors des phases orogéniques Andines responsables du soulèvement de la Cordillère Orientale. (Résumé d'auteur) %B ISAG99 : Symposium International sur la Géodynamique Andine %8 1999/10/04-06 %$ 064TECTO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Laumonier, Bernard %A Branquet, Y. %A Cheilletz, A. %A Giuliani, Gaston %T Structural setting and age of the Colombian emerald deposits : implications for the tectonic evolution of the Cordillera Oriental %S Géodynamique andine : résumés étendus = Andean geodynamics : extended abstracts = Geodinamica andina : resumenes expandidos %C Paris (FRA) ; Göttingen %D 1999 %L fdi:010022674 %G ENG %I IRD ; Georg August Universität %K TECTONIQUE ; GISEMENT ENDOGENE ; EXTENSION TECTONIQUE ; COMPRESSION TECTONIQUE ; MINERALISATION ; ANALYSE STRUCTURALE ; CHRONOLOGIE ; CRETACE ; TERTIAIRE ; EOCENE ; OLIGOCENE ; ETUDE COMPARATIVE %K ANDES ; COLOMBIE %K BOGOTA REGION %P 422-423 %U https://www.documentation.ird.fr/hor/fdi:010022674 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers09-03/010022674.pdf %W Horizon (IRD) %X A l'est de la Cordillère, les gisements se sont formés en contexte extensif, à la limite Crétacé-Tertiaire, bien avant les compressions andines néogènes à l'origine de la chaîne plissée et chevauchante vers l'est. A l'ouest de la Cordillère, les gisements et la chaîne plissée chevauchante vers l'ouest se font formés simultanément, en régime compressif, à l'Eocène supérieur ou au début de l'Oligocène, indépendament des phases andines néogènes. (Résumé d'auteur) %B ISAG99 : Symposium International sur la Géodynamique Andine %8 1999/10/04-06 %$ 064TECTO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %A France-Lanord, C. %A Coget, P. %A Schwarz, D. %A Notary, F. %A Cheilletz, A. %A Chaussidon, M. %A Giard, D. %A Piat, D. %A Bariand, P. %T Vers une carte d'identité isotopique 18O/16O des émeraudes naturelles et synthétiques %B L'émeraude : connaissances actuelles et prospectives %C Paris %D 1998 %E Giard, D. %E Giuliani, Gaston %E Cheilletz, A. %E Fritsch, Emmanuel %E Gonthier, E. %L fdi:010014838 %G FRE %I Association Française de Gemmologie %K MINERALOGIE ; GEOCHIMIE ; METHODE D'ANALYSE ; ANALYSE ISOTOPIQUE ; OXYGENE ; MINERALISATION ; GITOLOGIE %K EMERAUDE %P 55-70 %U https://www.documentation.ird.fr/hor/fdi:010014838 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-06/010014838.pdf %W Horizon (IRD) %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Zimmermann, J.L. %A Giuliani, Gaston %A Cheilletz, A. %T Les fluides dans les émeraudes : leur étude par spectrométrie de masse %B L'émeraude : connaissances actuelles et prospectives %C Paris %D 1998 %E Giard, D. %E Giuliani, Gaston %E Cheilletz, A. %E Fritsch, Emmanuel %E Gonthier, E. %L fdi:010014839 %G FRE %I Association Française de Gemmologie %K MINERALOGIE ; METHODE D'ANALYSE ; SPECTROMETRIE ; COMPOSITION CHIMIQUE ; ANALYSE QUANTITATIVE ; ANALYSE QUALITATIVE %K EMERAUDE %P 97-102 %U https://www.documentation.ird.fr/hor/fdi:010014839 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-06/010014839.pdf %W Horizon (IRD) %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Ohnenstetter, D. %A Giuliani, Gaston %A Bustos, O. %T Emeraudes trapiches colombiennes %B L'émeraude : connaissances actuelles et prospectives %C Paris %D 1998 %E Giard, D. %E Giuliani, Gaston %E Cheilletz, A. %E Fritsch, Emmanuel %E Gonthier, E. %L fdi:010014840 %G FRE %I Association Française de Gemmologie %K MINERALOGIE ; CRISTALLOGRAPHIE ; METHODE D'ANALYSE ; LUMINESCENCE %K EMERAUDE %P 119-124 %U https://www.documentation.ird.fr/hor/fdi:010014840 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-06/010014840.pdf %W Horizon (IRD) %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %T La rétrospective bibliographique de l'émeraude des années 90 %B L'émeraude = The emerald : connaissances actuelles et prospectives %C Paris %D 1998 %E Giard, D. %E Giuliani, Gaston %E Cheilletz, A. %E Fritsch, Emmanuel %E Gonthier, E. %L fdi:010014841 %G FRE %I Association Française de Gemmologie %K GITOLOGIE ; GEOCHIMIE ; BIBLIOGRAPHIE %K EMERAUDE ; 1990 1997 %P 217-220 %U https://www.documentation.ird.fr/hor/fdi:010014841 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-06/010014841.pdf %W Horizon (IRD) %$ 064PETRO %0 Edited Book %9 DO : Directions d'ouvrages ou de revues %A Giard, D. %A Giuliani, Gaston %A Cheilletz, A. %A Fritsch, Emmanuel %A Gonthier, E. %T L'émeraude : connaissances actuelles et prospectives %C Paris %D 1998 %L fdi:010014836 %G FRE %I Association Française de Gemmologie %K MINERALOGIE ; GITOLOGIE ; GEOCHIMIE ; COMPOSITION CHIMIQUE ; CRISTALLOGRAPHIE ; METHODE D'ANALYSE ; ANALYSE ISOTOPIQUE ; SPECTROMETRIE INFRAROUGE ; SPECTROMETRIE ; SYNTHESE ; EXPLOITATION DU SOUS SOL %K EMERAUDE %P 235 %U https://www.documentation.ird.fr/hor/fdi:010014836 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-06/010014836.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A France-Lanord, C. %A Zimmermann, J.L. %A Cheilletz, A. %A Arboleda, C. %A Charoy, B. %A Coget, P. %A Fontan, F. %A Giard, D. %T Fluid composition, D of channel H2O, and 18O of lattice oxygen in beryls : genetic implications for Brazilian, Colombian, and Afghanistani emerald deposits %D 1997 %L fdi:010059690 %G ENG %J International Geology Review %@ 0020-6814 %K MINERAL ; BERYLIUM ; METHODE D'ANALYSE ; SPECTROMETRIE ; ANALYSE ISOTOPIQUE ; OXYGENE ; HYDROGENE ; VARIATION SPATIALE %K EMERAUDE ; ORIGINE GEOGRAPHIQUE ; GISEMENT %K BRESIL ; AFGHANISTAN ; COLOMBIE ; ALGERIE ; PORTUGAL %K ADRA RENAISSANCE ; MANGUALDE ; CARNAIBA ; SANTA TEREZINHA ; LASSUR ; ORIENTE ; GUALA ; COSCUEZ ; CINCHO ; GUJARI %N 5 %P 400-424 %R 10.1080/00206819709465280 %U https://www.documentation.ird.fr/hor/fdi:010059690 %> https://www.documentation.ird.fr/intranet/publi/depot/2013-07-31/010059690.pdf %V 39 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Zimmermann, J.L. %A Giuliani, Gaston %A Cheilletz, A. %A Arboleda, C. %T Mineralogical significance of fluids in channels of colombian emeralds : a mass-spectrometry study %D 1997 %L fdi:010059691 %G ENG %J International Geology Review %@ 0020-6814 %K MINERAL ; BERYLIUM ; SPECTROMETRIE ; ANALYSE CHIMIQUE ; ANALYSE MINERALOGIQUE ; ALTERATION HYDROTHERMALE ; MINERALISATION ; SODIUM ; TEMPERATURE ; GISEMENT ENDOGENE %K EMERAUDE %K ANDES ; COLOMBIE %K GUALA ; ORIENTE ; COSCUEZ ; CINCHO ; VEGA SAN JUAN ; PALO ARANADO ; YACOPI ; PAVA ; TEQUENDEMA %N 5 %P 425-437 %R 10.1080/00206819709465281 %U https://www.documentation.ird.fr/hor/fdi:010059691 %> https://www.documentation.ird.fr/intranet/publi/depot/2013-07-31/010059691.pdf %V 39 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Ribeiro-Althoff, A.M. %A Cheilletz, A. %A Giuliani, Gaston %A Féraud, G. %A Barbosa Camacho, G. %A Zimmermann, J.L. %T 40Ar/39Ar and K-Ar geochronological evidence for two periods (2 Ga and 650 to 500 Ma) of emerald formation in Brazil %D 1997 %L fdi:010059692 %G ENG %J International Geology Review %@ 0020-6814 %K MINERAL ; BERYLIUM ; DATATION ; ANALYSE ISOTOPIQUE ; MINERALISATION ; GISEMENT ENDOGENE %K EMERAUDE %K BRESIL %K SANTA TEREZINHA ; SOCOTO ; CARNAIBA ; PIRENPOLIS ; COQUI ; CAPOEIRANA ; POMBOS ; JUCA %N 10 %P 924-937 %R 10.1080/00206819709465310 %U https://www.documentation.ird.fr/hor/fdi:010059692 %> https://www.documentation.ird.fr/intranet/publi/depot/2013-07-31/010059692.pdf %V 39 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Cheilletz, A. %A Zimmermann, J.L. %A Ribeiro-Althoff, A.M. %A France-Lanord, C. %A Feraud, G. %T Les gisements d'émeraude du Brésil : genèse et typologie %D 1997 %L fdi:010030884 %G FRE %J Chronique de la Recherche Minière %@ 0182-564 %K MINERAL ; BERYLIUM ; GITOLOGIE ; GISEMENT ENDOGENE ; GISEMENT STRATIFORME ; TYPOLOGIE ; GENESE ; GEOCHIMIE ; MINERALISATION ; TECTONIQUE ; FAILLE ; ALTERATION HYDROTHERMALE ; ROCHE BASIQUE ; ROCHE ULTRABASIQUE ; ROCHE ENCAISSANTE ; SCHISTE ; DATATION ; ANALYSE CHIMIQUE ; ANALYSE MINERALOGIQUE %K BRESIL ; BAHIA ; MINAS GERAIS ; GOIAS %K CARNAIBA ; SOCOTO ; MINA BELMONT ; CAPOEIRANA ; SANTA TEREZINHA %N 526 %P 17-61 %U https://www.documentation.ird.fr/hor/fdi:010030884 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-05/010030884.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Cheilletz, A. %A Giuliani, Gaston %T Comment se forment les émeraudes : caractériser la géologie des gisements pour mieux distinguer les vraies des fausses %D 1997 %L fdi:010011857 %G FRE %J La Recherche %@ 0029-5671 %K GEOCHIMIE ; GITOLOGIE ; MINERALISATION ; CRISTALLOGRAPHIE ; COMPOSITION CHIMIQUE ; METHODOLOGIE %K EMERAUDE %K BRESIL ; COLOMBIE %N 303 %P 48-52 %U https://www.documentation.ird.fr/hor/fdi:010011857 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_47-48/010011857.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Cheilletz, A. %A Giuliani, Gaston %A Branquet, Y. %A Laumonier, B. %A Sanchez M., A.J. %A Féraud, G. %A Arhan, T. %T Datation K-Ar et 40Ar/39Ar à 65 + ou - 3Ma des gisements d'émeraude du district de Chivor-Macanal : argument en faveur d'une déformation précoce dans la Cordillère orientale de Colombie %D 1997 %L fdi:010018401 %G ENG %J Comptes-Rendus de l'Académie des Sciences. Série 2a : Sciences de la Terre et des Planètes %@ 1250-8050 %K ROCHE CRISTALLINE ; GISEMENT STRATIFORME ; DATATION ; GEOCHIMIE ; EVOLUTION ; MINERALISATION ; TECTONIQUE ; CRETACE ; TERTIAIRE %K COLOMBIE %K CHIVOR-MACANAL GISEMENT %N 5 %P 369-377 %U https://www.documentation.ird.fr/hor/fdi:010018401 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_49-50/010018401.pdf %V 324 %W Horizon (IRD) %X La genèse des gisements d'émeraude de Colombie, du district de Chivor-Marcanal, dans la Cordillère orientale, est associée à un épisode tectonique daté à 65 plus ou moins 3 Ma par K-Ar et 40Ar/39Ar. (Résumé d'auteur) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Fortes P. de Tarso Ferro de Oliveira %A Giuliani, Gaston %A Féraud, G. %T A Brasiliano age (500 +/- Ma) for the mina III gold deposit, Crixas Greenstone belt, Central Brazil %D 1997 %L fdi:010019277 %G ENG %J International Geology Review %@ 0020-6814 %K MINERAI METALLIQUE ; OR ; MINE ; GEOCHRONOLOGIE ; DATATION ; ISOTOPE RADIOACTIF ; MINERALISATION ; METAMORPHISME ; SCHISTE ; AMPHIBOLE %K BRESIL ; GOIAS %K CRIXAS %P 449-460 %U https://www.documentation.ird.fr/hor/fdi:010019277 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_51-52/010019277.pdf %V 39 %W Horizon (IRD) %X K-Ar and 40Ar/39Ar geochronological studies were performed on selected minerals from the Minna III gold deposit, Crixas greenstone belt, state of Goias, central Brazil. They include amphibole and biotite from amphibole schists ; biotite from quartz-chlorite-carbonate-muscovite schists ; chloritoid, muscovite, and paragonite from muscovite schists ; and biotite from biotite-marbles. Analyses yielded ages between 750 and 500 Ma, indicating that the Brasiliano orogenic event affected rocks of the Archean greenstone belt. It is proposed that the gold mineralization, closely related to a post-metamorphic peak hydrothermal alteration and spatially associated with muscovite schists, is 505 +/- 10 Ma, whereas older ages may indicate an excess of argon. (Résumé d'auteur) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Cheilletz, A. %A Rueda, F. %T La formation des gisements d'émeraudes de Colombie %D 1996 %L fdi:010007093 %G ENG ; SPA %J ORSTOM Actualités %@ 0758-833X %K GEOCHIMIE ; GITOLOGIE ; MINERALISATION ; MODELISATION ; EVAPORITE ; PROJET DE RECHERCHE %K EMERAUDE ; MODELE METALLOGENIQUE ; BERYLLIUM %K COLOMBIE %N 50 %P 17-24 %U https://www.documentation.ird.fr/hor/fdi:010007093 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers16-08/010007093.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Laumonier, B. %A Branquet, Y. %A Lopes, B. %A Cheilletz, A. %A Giuliani, Gaston %A Rueda, F. %T Mise en évidence d'une tectonique compressive Eocène-Oligocène dans l'ouest de la cordillère orientale de Colombie, d'après la structure en duplex des gisements d'émeraude de Muzo et de Coscuez %D 1996 %L fdi:010007514 %G FRE %J Comptes Rendus de l'Academie des Sciences de Paris.Serie 2a : Sciences de la Terre et des Planètes %@ 0764-4450 %K COMPRESSION TECTONIQUE ; EOCENE ; OLIGOCENE ; GITOLOGIE ; CHEVAUCHEMENT ; FAILLE %K EMERAUDE %K COLOMBIE %K ANDES ; MUZO REGION ; COSCUEZ REGION %N 8 %P 705-712 %U https://www.documentation.ird.fr/hor/fdi:010007514 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_45-46/010007514.pdf %V 323 %W Horizon (IRD) %X Les structures des gisements d'émeraude de l'Ouest de la Cordillère Orientale de Colombie (chevauchements, plis de rampe, duplex, failles de déchirement) résultent de trois épisodes de déformation formant une phase de tectonique compressive, synchrone de l'hydrothermalisme à l'origine de la minéralisation et, comme lui, datant de la limite Eocène-Oligocène. (Résumé d'auteur) %$ 064TECTO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Branquet, Y. %A Laumonier, B. %A Lopes, B. %A Cheilletz, A. %A Giuliani, Gaston %A Rueda, F. %T Evidences of compressive structures in the Muzo and Coscuez emerald deposits, Eastern Cordillera of Colombia %B Géodynamique andine : résumé étendus = Andean geodynamics : extended abstracts %C Paris %D 1996 %L fdi:010008677 %G ENG %I ORSTOM %@ 2-7099-1332-1 %K GEOLOGIE STRUCTURALE ; COMPRESSION TECTONIQUE ; MINERALISATION ; GITOLOGIE %K HYDROTHERMALISME ; EMERAUDE %K COLOMBIE %K ANDES EST ; MUZO REGION ; COSCUEZ REGION %P 675-677 %U https://www.documentation.ird.fr/hor/fdi:010008677 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers4/010008677.pdf %W Horizon (IRD) %X Les gisements d'émeraude de Muzo et Coscuez localisés sur la bordure ouest de la Cordillère orientale de Colombie, présentent une importante tectonique en chevauchement. Plusieurs phases compressives de vergences différentes développent ces chevauchements. Les datations radiométriques sur les phases fluides associés à ces évènements compressifs fournissent un âge limite Eocène-Oligocène. (Résumé d'auteur) %S Colloques et Séminaires %B ISAG 96 : Symposium International sur la Géodynamique Andine %8 1996/09/17-19 %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %A Cheilletz, A. %A France-Lanord, C. %A Rueda, F. %T The role of organic matter in high temperature hydrothermal regimes %B Géodynamique andine : résumé étendus = Andean geodynamics : extended abstracts %C Paris %D 1996 %L fdi:010008679 %G ENG %I ORSTOM %@ 2-7099-1332-1 %K GEOCHIMIE ; MATIERE ORGANIQUE ; SEDIMENTOLOGIE ; CRETACE ; ALTERATION HYDROTHERMALE ; MINERALISATION ; GITOLOGIE %K EMERAUDE %K ANDES ; COLOMBIE %P 683-686 %U https://www.documentation.ird.fr/hor/fdi:010008679 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers4/010008679.pdf %W Horizon (IRD) %X L'étude des gisements d'émeraude de Colombie, qui sont encaissés dans les schistes noirs riches en matière organique du Crétacé inférieur de la Cordillère orientale, nous a permis de préciser le rôle joué par la matière organique dans un système hydrothermal à haute température (300°C). Elle permet le développement de réactions de thermoréduction de sulfates (TRS) qui provoquent la précipitation de pyrite, carbonate et bitume hydrothermaux. (Résumé d'auteur) %S Colloques et Séminaires %B ISAG 96 : Symposium International sur la Géodynamique Andine %8 1996/09/17-19 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Cheilletz, A. %A Arboleda, C. %A Carrillo, V. %A Rueda, F. %A Baker, J.H. %T An evaporitic origin of the parent brines of Colombian emeralds : fluid inclusion and sulphur isotope evidence %D 1995 %L fdi:42470 %G ENG %J European Journal of Mineralogy %@ 0935-1221 %K GEOCHIMIE ; MINERALISATION ; ALTERATION HYDROTHERMALE ; MICROSCOPIE ELECTRONIQUE A BALAYAGE ; GITOLOGIE %K EMERAUDE %K COLOMBIE %N 1 %P 151-165 %U https://www.documentation.ird.fr/hor/fdi:42470 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/42470.pdf %V 7 %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Tarso Ferro de Oliveira Fortes, P. de %A Giuliani, Gaston %T Les phases fluides associées aux corps sulfurés du gisement d'or Mina 3, ceinture de roches vertes de Crixas, Etat de Goias, Brésil %D 1995 %L fdi:43156 %G ENG ; FRE %J Comptes Rendus de l'Académie des Sciences de Paris.Série 2a : Sciences de la Terre et des Planètes %@ 1250-8050 %K GEOCHIMIE ; OR ; GITOLOGIE ; PETROGRAPHIE ; METHODE D'ANALYSE %K INCLUSION FLUIDE %K BRESIL ; GOIAS %K CRIXAS REGION %P 1171-1178 %U https://www.documentation.ird.fr/hor/fdi:43156 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_39-40/43156.pdf %V 320 %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Michel, D. %A Giuliani, Gaston %A Pulz, G.M. %A Jost, H. %T Multistage gold deposition in the Archaean Maria Lazara gold deposit (Goias, Brazil) %D 1994 %L fdi:41481 %G ENG %J Mineralium Deposita %@ 0026-4598 %K GEOCHIMIE ; OR ; GITOLOGIE ; MINERALOGIE ; PARAGENESE %K BRESIL ; GOIAS %K MARIA LAZARA REGION %N 29 %P 94-97 %U https://www.documentation.ird.fr/hor/fdi:41481 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41481.pdf %W Horizon (IRD) %X The Maria Lazara gold deposit in the Archaean Guarinos greenstone belt, central Brazil, consists of quartz-carbonate veins formed in a ductile shear zone. Study of the sulphides and gold-bearing quartz-carbonate veins and veinlets of the potassic hydrothermal alteration zone reveals two stages of ore paragenesis. The first stage corresponds to S-rich arsenopyrite deposition and the second one to the precipitation of As-rich arsenopyrite and Bi-Te-Au-S phases. Modes of occurrence, textures and Ag contents of native gold define two types of gold. The first type is native gold with Ag contents greater than 5 wt % postdating the S-rich arsenopyrites. The second type has Ag contents less than 3 wt % and is contemporaneous with Bi-Te-S phases. (Résumé d'auteur) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Zimmermann, J.L. %A Montigny, R. %T K-Ar and 40Ar/39Ar evidence for a transamazonian age (2030-1970 Ma) for the granites and emerald-bearing K-metasomatites from Campo Formoso and Carnaiba (Bahia, Brazil) %D 1994 %L fdi:41482 %G ENG %J Journal of South American Earth Sciences %@ 0895-9811 %K GRANITE ; PETROLOGIE ; GEOCHIMIE ; MINERALISATION ; DATATION ABSOLUE ; METALLOGENIE %K EMERAUDE %K BRESIL ; BAHIA %K CAMPO FORMOSO REGION ; CARNAIBA REGION %N 2 %P 149-165 %R 10.1016/0895-9811(94)90005-1 %U https://www.documentation.ird.fr/hor/fdi:41482 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41482.pdf %V 7 %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Michel, D. %A Giuliani, Gaston %A Ribeiro Olivo, G. %A Joao Marini, O. %T As growth banding and the presence of Au in pyrites from the Santa Rita gold vein deposit hosted in proterozoic metasediments, Goias state, Brazil %D 1994 %L fdi:41485 %G ENG %J Economic Geology %@ 0361-0128 %K GEOCHIMIE ; OR ; GITOLOGIE ; PARAGENESE %K BRESIL ; GOIAS %K SANTA RITA REGION %P 193-200 %R 10.2113/gsecongeo.89.1.193 %U https://www.documentation.ird.fr/hor/fdi:41485 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41485.pdf %V 89 %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Cheilletz, A. %A Féraud, G. %A Giuliani, Gaston %A Rodriguez, C.T. %T Time-pressure and temperature constraints on the formation of Colombian emeralds : an 40Ar/39Ar laser microprobe and fluid inclusion study %D 1994 %L fdi:41486 %G ENG %J Economic Geology %@ 0361-0128 %K GEOCHIMIE ; PARAGENESE ; DATATION ABSOLUE ; METALLOGENIE %K EMERAUDE %K COLOMBIE %K COSCUEZ REGION ; QUIPAMA REGION %P 361-380 %R 10.2113/gsecongeo.89.2.361 %U https://www.documentation.ird.fr/hor/fdi:41486 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41486.pdf %V 89 %W Horizon (IRD) %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Ronchi, L.H. %A Giuliani, Gaston %A Campolin Fogaça, A.C. %T Inclusoes fluidas associadas aos veios de quartzo auriferos de Costa Sena e Diamantina - MG %S Boletim de resumos expandidos do 38o congresso brasileiro de geologia %C s.l. %D 1994 %L fdi:41483 %G POR %I Sociedade Brasileira de Geologia %K GEOCHIMIE ; QUARTZ ; OR ; PARAGENESE %K BRESIL ; MATO GROSSO %K COSTA SENA REGION ; DIAMANTINA REGION %P 648 %U https://www.documentation.ird.fr/hor/fdi:41483 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41483.pdf %W Horizon (IRD) %B Congresso Brasileiro de Geologia %8 1994/10/23-28 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Salim, J. %A Verkaeren, J. %A Giuliani, Gaston %T Alteraçao hidrothermal dos skarns da mina Brejui, Currais Novos (RN) %S Metalogenese e recursos minerais %C s.l. %D 1994 %L fdi:41484 %G POR %I s.n. %K SKARN ; GEOCHIMIE ; ALTERATION HYDROTHERMALE ; PARAGENESE %K BRESIL %K CURRAIS NOVOS REGION %P 278-280 %U https://www.documentation.ird.fr/hor/fdi:41484 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41484.pdf %W Horizon (IRD) %B Congresso Brasileiro de Geologia %8 1994/10/23-28 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Cheilletz, A. %A Féraud, G. %A Zimmermann, J.L. %A Carrillo, V. %A Rueda, F.O. %A Baker, J. %A Montigny, R. %T Age and sulphur isotope signatures of Brazilian and Colombian emeralds %S Septimo congreso geologico chileno %C Concepcion %D 1994 %L fdi:41487 %G ENG %I Universidad de Concepcion %K GEOCHIMIE ; GITOLOGIE ; COMPOSITION CHIMIQUE ; SULFURE ; ISOTOPE ; DATATION ABSOLUE %K EMERAUDE ; COMPOSITION ISOTOPIQUE %K BRESIL ; COLOMBIE %P 1491-1495 %U https://www.documentation.ird.fr/hor/fdi:41487 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41487.pdf %W Horizon (IRD) %B Congreso Geologico Chileno %8 1994 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Cheilletz, A. %A Carrillo, V. %A Rueda, F.O. %T The formation of the emerald deposits of Colombia : an example of basinal fluids migration within the Eastern Cordillera of Colombia %S Quinta conferencia bienal panamericana en investigacion sobre inclusiones fluidas = Fifth biennial pan-american conference on research on fluid inclusions %C Cuernavaca (MEX) ; Morelos %D 1994 %E Izquierdo M., G. %E Suarez A., M.C. %E Guevara G., M. %E Vanko, D. %E Viggiano G., J.C. %L fdi:41488 %G ENG %I Gerencia de Proyectos Geotermoelectricos ; Instituto de Investigaciones Electricas %K GEOCHIMIE ; GITOLOGIE ; MINERALISATION ; METALLOGENIE %K EMERAUDE %K COLOMBIE %P 26-27 %U https://www.documentation.ird.fr/hor/fdi:41488 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41488.pdf %W Horizon (IRD) %B Conferencia Bienal Panamericana en Investigacion sobre Inclusiones Fluidas = Biennial Pan-American Conference on Research on Fluid Inclusions %8 1994/05/19-21 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Cheilletz, A. %A Féraud, G. %A Giuliani, Gaston %A Ruffet, G. %T Emerald dating through 40Ar/39Ar step-heating and laser spot analysis of syngenetic phlogopite %D 1993 %L fdi:40533 %G ENG %J Earth and Planetary Science Letters %@ 0012-821X %K GEOCHIMIE ; GITOLOGIE ; DATATION ABSOLUE ; MINERALISATION ; METHODE D'ANALYSE %K EMERAUDE ; ARGON %K BRESIL ; BAHIA %N 120 %P 473-485 %R 10.1016/0012-821X(93)90258-B %U https://www.documentation.ird.fr/hor/fdi:40533 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40533.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Cheilletz, A. %A Baker, J. %A Arhan, T. %T Evaporitic origin of the parent brines of Colombian emeralds : fluid inclusion and sulphur isotopic evidences %B Twelfth biennial symposium of the European Current Research on Fluid Inclusions %D 1993 %L fdi:40560 %G ENG %J Archiwum Mineralogiczne %K GEOCHIMIE ; GITOLOGIE ; MINERALISATION ; ALTERATION HYDROTHERMALE %K EMERAUDE %K COLOMBIE %N 1 %P 82-84 %U https://www.documentation.ird.fr/hor/fdi:40560 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40560.pdf %V 49 %W Horizon (IRD) %B Biennial Symposium of the European Current Research on Fluid Inclusions %8 1993/06/13-18 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Olivo, G.R. %A Marini, O.J. %A Michel, D. %T The Santa Rita gold deposit in the proterozoic Paranoa group, Goias, Brazil : an example of fluid mixing during ore deposition %D 1993 %L fdi:40561 %G ENG %J Ore Geology Reviews %@ 0169-1368 %K GEOCHIMIE ; OR ; GITOLOGIE ; MINERALISATION ; ALTERATION HYDROTHERMALE ; RESULTAT ANALYTIQUE %K BRESIL ; GOIAS %K SANTA RITA REGION %N 8 %P 503-523 %R 10.1016/0169-1368(93)90042-W %U https://www.documentation.ird.fr/hor/fdi:40561 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40561.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Pulz, G.M. %A Jost, H. %A Giuliani, Gaston %A Michel, D. %T Evidencias mineralogicas e estruturais da percolaçao episodica de fluidos hidrotermais no deposito aurifero Maria Lazara, Goias %D 1993 %L fdi:40564 %G POR %J Anales de l'Academie Brasileira de Ciencias %K GEOCHIMIE ; OR ; GITOLOGIE ; MINERALISATION ; ALTERATION HYDROTHERMALE %K BRESIL ; GOIAS %K MARIA LAZARA REGION %N 1 %P 19-28 %U https://www.documentation.ird.fr/hor/fdi:40564 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40564.pdf %V 65 %W Horizon (IRD) %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Cheilletz, A. %A Giuliani, Gaston %A Arhan, T. %T Late eocene-oligocene shortening episode in Eastern cordillera of Colombia viewed by emerald dating %B Géodynamique andine : résumés étendus = Andean geodynamics : extended abstracts = Geodinamica andina : resumenes expandidos %C Paris %D 1993 %L fdi:38474 %G ENG %I ORSTOM %@ 2-7099-1154-X %K GITOLOGIE ; METALLOGENIE ; TECTONIQUE ; ALTERATION HYDROTHERMALE %K EMERAUDE %K COLOMBIE EST ; ANDES %P 473-476 %U https://www.documentation.ird.fr/hor/fdi:38474 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/colloques2/38474.pdf %W Horizon (IRD) %S Colloques et Séminaires %B Géodynamique Andine : Symposium International %8 1993/09/21-23 %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %A Cheilletz, A. %A Sheppard, S.M.F. %A Arboleda, C. %T Geochemistry and origin of the emerald deposits of Colombia %B Current research in geology applied to ore deposits %C s.l. %D 1993 %E Fenoll Hach-Ali %E Torres-Ruiz %E Gervilla %L fdi:40563 %G ENG %I s.n. %@ 84-338-1772-8 %K GEOCHIMIE ; GITOLOGIE ; MINERALISATION ; ALTERATION HYDROTHERMALE %K EMERAUDE %K COLOMBIE %P 105-108 %U https://www.documentation.ird.fr/hor/fdi:40563 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40563.pdf %W Horizon (IRD) %B Biennial SGA Meeting %8 1993/09/09-11 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %T Chemical composition of fluid inclusions in Colombian emerald deposits %S Proceedings of the eighth quadrennial IAGOD symposium %C Stuttgart %D 1993 %L fdi:40542 %G ENG %I E. Schweizerbart %K GEOCHIMIE ; GITOLOGIE ; MINERALISATION ; COMPOSITION CHIMIQUE ; METHODE D'ANALYSE %K EMERAUDE %K COLOMBIE %P 159-168 %U https://www.documentation.ird.fr/hor/fdi:40542 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40542.pdf %W Horizon (IRD) %B Quadrennial IAGOD Symposium %8 1993 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Tarso Ferro de Oliveira Fortes, P. de %A Giuliani, Gaston %T Caracterizaçao quimica da arsenopirita e do ouro nos corpos de minerio do deposito aurifero Mina 3, Crixas, Goias %S Congresso brasileiro de geoquimica %C Brasilia %D 1993 %L fdi:40557 %G POR %I s.n. %K GEOCHIMIE ; OR ; GITOLOGIE ; PETROGRAPHIE ; METHODE D'ANALYSE %K BRESIL ; GOIAS %K CRIXAS REGION %P 161-163 %U https://www.documentation.ird.fr/hor/fdi:40557 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40557.pdf %W Horizon (IRD) %B Congresso Brasileiro de Geoquimica %8 1993/10 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Boaventura, G.R. %A Giuliani, Gaston %T Avaliaçao de resultados de analise de rochas graniticas, realizadas pelo laboratorio de geoquimica da UnB, usando espectrometria de plasma (ICP) %S Congresso brasileiro de geoquimica %C Brasilia %D 1993 %L fdi:40558 %G POR %I s.n. %K GEOCHIMIE ; SPECTROMETRIE ; METHODOLOGIE %K BRESIL %P 281-282 %U https://www.documentation.ird.fr/hor/fdi:40558 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40558.pdf %W Horizon (IRD) %B Congresso Brasileiro de Geoquimica %8 1993/10 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Tarso Ferro de Oliveira Fortes, P. de %A Giuliani, Gaston %T Estudo de inclusoes fluidas em corpos de minerio (sulfeto maciço e veio de quartzo) do deposito aurifero Mina 3, Crixas, Goias %S Congresso brasileiro de geoquimica %C Brasilia %D 1993 %L fdi:40559 %G POR %I s.n. %K GEOCHIMIE ; OR ; GITOLOGIE ; ALTERATION %K BRESIL ; GOIAS %K CRIXAS REGION %P 154-156 %U https://www.documentation.ird.fr/hor/fdi:40559 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40559.pdf %W Horizon (IRD) %B Congresso Brasileiro de Geoquimica %8 1993/10 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A A. Fernandes, P. C. d' %A McReath, I. %A Giuliani, Gaston %T Petrogenesis and Mo, U mineralizations in early proterozoic charnockites and granites from the Itaberaba district (Bahia, Brazil) %S Magmatismo granitico e mineralizaçoes associadas : resumos expandidos, roteiro de excursao, programa %C Recife %D 1993 %L fdi:40562 %G ENG %I s.n. %K GRANITE ; PETROGRAPHIE ; MINERALOGIE ; DIFFERENTIATION MAGMATIQUE ; METAMORPHISME %K CHARNOCKITE %K BRESIL ; BAHIA %K ITABERABA REGION %P 62-65 %U https://www.documentation.ird.fr/hor/fdi:40562 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40562.pdf %W Horizon (IRD) %B Magmatismo Granitico e Mineralizaçoes Associadas %8 1993/09/22-29 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Cheilletz, A. %A Féraud, G. %T Emerald dating through 40Ar/39Ar step heating and laser spot analysis %S Seventh meeting of the European Union of Geosciences %C s.l. %D 1993 %L fdi:40565 %G ENG %I s.n. %K GEOCHIMIE ; DATATION ABSOLUE ; METHODOLOGIE %K EMERAUDE ; ARGON %K BRESIL ; COLOMBIE %P 386 %U https://www.documentation.ird.fr/hor/fdi:40565 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40565.pdf %W Horizon (IRD) %B Meeting of the European Union of Geosciences %8 1993/04/04-08 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Sheppard, S.M.F. %A Cheilletz, A. %A Rodriguez, C. %T Contribution de l'étude des phases fluides et de la géochimie isotopique 18O/16O, 13C/12C à la genèse des gisements d'émeraude de la Cordillère orientale de la Colombie %D 1992 %L fdi:35420 %G FRE ; ENG %J Comptes Rendus de l'Académie des Sciences.Série 2 : Mécanique... %@ 0249-6305 %K GEOCHIMIE ; MINERALOGIE ; MINERALISATION ; ISOTOPE ; OXYGENE ; CARBONE %K EMERAUDE ; INCLUSION FLUIDE ; FLUIDE MINERALISATEUR %K COLOMBIE %K CORDILLERE ORIENTALE ; ANDES %N 3 %P 269-274 %U https://www.documentation.ird.fr/hor/fdi:35420 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/35420.pdf %V 314 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Tarso Ferro de Oliveira Fortes, P. de %A Giuliani, Gaston %T Estudo preliminar dos fluidos associados aos corpos de sulfeto maciço do deposito aurifero Mina 3, Crixas, Go %D 1992 %L fdi:37557 %G POR %J Boletim - Sociedade Brasileira de Geologia, Nucleo Centro-Oeste %K GEOCHIMIE ; OR ; MINERALISATION ; GITOLOGIE ; ALTERATION HYDROTHERMALE %K INCLUSION FLUIDE ; FLUIDE MINERALISATEUR %K BRESIL ; GOIAS %K CRIXAS REGION %N 15 %P 99-109 %U https://www.documentation.ird.fr/hor/fdi:37557 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_33-34/37557.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Ronchi, L.H. %A Giuliani, Gaston %A Beny, C. %A Fogaça, A.C.C. %T Caracterizaçao fisico-quimica dos fluidos associados aos veios de quartzo auriferos de Costa Sena - MG %D 1992 %L fdi:41489 %G POR %J Revista Brasileira de Geociencias %K GEOCHIMIE ; QUARTZ ; OR ; MINERALISATION ; METHODE D'ANALYSE ; RESULTAT ANALYTIQUE %K BRESIL ; MATO GROSSO %K COSTA SENA REGION %N 2 %P 129-138 %U https://www.documentation.ird.fr/hor/fdi:41489 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/41489.pdf %V 22 %W Horizon (IRD) %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Avila Fernandes, P.C. d' %A Giuliani, Gaston %A Mac Reath, I. %T Metamorfismo de alto grau e anatexia no limite norte do nucleo de Jequié, Itaberaba, Bahia %S Primeiro simposio regional de geologia Bahia-Sergipe %C Salvador %D 1992 %L fdi:37554 %G POR %I ANAIS %K GEODYNAMIQUE ; METAMORPHISME REGIONAL ; ANATEXIE %K BRESIL ; BAHIA %K ITABERABA REGION %P 101-104 %U https://www.documentation.ird.fr/hor/fdi:37554 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_33-34/37554.pdf %W Horizon (IRD) %B Simposio Regional de Geologia Bahia-Sergipe %8 1992/05/04-07 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Avila Fernandes, P.C. d' %A Giuliani, Gaston %A Mac Reath, I. %T O distrito urano-molibdenifero transamazonico de Itaberaba, Bahia %S Primero simposio regional de geologia Bahia-Sergipe %C Salvador %D 1992 %L fdi:37555 %G POR %I ANAIS %K GEOCHIMIE ; MINERALISATION ; MOLYBDENE ; URANIUM %K BRESIL ; BAHIA %K ITABERABA REGION %P 141-143 %U https://www.documentation.ird.fr/hor/fdi:37555 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_33-34/37555.pdf %W Horizon (IRD) %B Simposio Regional de Geologia Bahia-Sergipe %8 1992/05/04-07 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Avila Fernandes, P.C. d' %A Mac Reath, I. %A Giuliani, Gaston %T O macico transamazonico de Pedra d'Agua (Itaberaba, Bahia) : um charnockito peraluminoso de fonte crustal %S Primero simposio regional de geologia Bahia-Sergipe %C Salvador %D 1992 %L fdi:37556 %G POR %I ANAIS %K PETROGRAPHIE ; MINERALOGIE ; DIFFERENTIATION MAGMATIQUE %K CHARNOCKITE %K BRESIL ; BAHIA %K ITABERABA REGION %P 155-159 %U https://www.documentation.ird.fr/hor/fdi:37556 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_33-34/37556.pdf %W Horizon (IRD) %B Simposio Regional de Geologia Bahia-Sergipe %8 1992/05/04-07 %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Coelho, C.E.S. %A Ramboz, C. %A Beny, C. %A Touray, J.C. %A Giuliani, Gaston %T Fluid inclusion constraints on the origin of Fadenza Brasileiro Gold Mine %B EUG 6 : sixth meeting of the European Union of Geosciences %D 1991 %L fdi:34841 %G ENG %J Terra Abstracts %@ 0954-4887 %K OR ; GITOLOGIE ; QUARTZ ; GEOCHIMIE ; METALLOGENIE %K INCLUSION FLUIDE %K BRESIL %K FAZENDA BRASILEIRO %N 1 %P 192 %U https://www.documentation.ird.fr/hor/fdi:34841 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34841.pdf %V 3 %W Horizon (IRD) %B Meeting of the European Union of Geosciences %8 1991/03/24-28 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Zimmermann, J.L. %A Cheilletz, A. %A Montigny, R. %T Comparison of K-Ar and 39Ar-40Ar on granites and on emerald-bearing metasomatites from Campo Formoso and Carnaïba, Bahia, Brazil %B EUG 6 : sixth meeting of the European Union of Geosciences %D 1991 %L fdi:34842 %G ENG %J Terra Abstracts %@ 0954-4887 %K GRANITE ; GEOCHIMIE ; DATATION ABSOLUE %K EMERAUDE %K BRESIL ; BAHIA %K CAMPO FORMOSO ; CARNAIBA %N 1 %P 500 %U https://www.documentation.ird.fr/hor/fdi:34842 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34842.pdf %V 3 %W Horizon (IRD) %B Meeting of the European Union of Geosciences %8 1991/03/24-28 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Cheilletz, A. %A Dubessy, J. %A Rodriguez, C. %T H2O-NaCl-CaCl2-bearing fluids in emeralds from the Vega San Juan mine, Gachala district, Colombia %B ECROFI 11 : European current research on fluid inclusions %D 1991 %L fdi:34844 %G ENG %J Plinius %@ 1120-317X %K GITOLOGIE ; MINERALISATION ; GEOCHIMIE ; SALINITE %K EMERAUDE ; INCLUSION FLUIDE %K COLOMBIE %K GACHALA REGION %N 5 %P 90 %U https://www.documentation.ird.fr/hor/fdi:34844 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34844.pdf %W Horizon (IRD) %B ECROFI : European Current Research on Fluid Inclusions %8 1991/04/10-12 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Olivo, G.R. %A Marini, J.O. %A Dubessy, J. %A Michel, D. %T CO2-N2-hypersaline-bearing fluids associated to the Santa Rita hydrothermal gold occurences, Paranoa group (Goias-Brazil) %B ECROFI 11 : European current research on fluid inclusions %D 1991 %L fdi:34845 %G ENG %J Plinius %@ 1120-317X %K OR ; GITOLOGIE ; GEOCHIMIE ; ALTERATION HYDROTHERMALE %K INCLUSION FLUIDE %K BRESIL ; GOIAS %K SANTA RITA %N 5 %P 91-92 %U https://www.documentation.ird.fr/hor/fdi:34845 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34845.pdf %W Horizon (IRD) %B ECROFI : European Current Research on Fluid Inclusions %8 1991/04/10-12 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Ronchi, L.H. %A Giuliani, Gaston %A Beny, C. %A Fogaça, A.C.C. %T Physico-chemical evolution of the fluids associated to the Costa Sena gold quartz veins (MG-Brazil) %B ECROFI 11 : European current research on fluid inclusions %D 1991 %L fdi:34846 %G ENG %J Plinius %@ 1120-317X %K OR ; GITOLOGIE ; QUARTZ ; GEOCHIMIE ; MINERALISATION %K INCLUSION FLUIDE %K BRESIL ; MINAS GERAIS %K COSTA SENA %N 5 %P 185-186 %U https://www.documentation.ird.fr/hor/fdi:34846 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34846.pdf %W Horizon (IRD) %B ECROFI : European Current Research on Fluid Inclusions %8 1991/04/10-12 %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Olivo, G.R. %A Marini, O.J. %A Giuliani, Gaston %T Hydrothermal gold occurrences hosted by middle to upper proterozoic carbonate sequence : the example of Santa Rita prospect, Goias, Brazil %B Brazil gold' 91 : the economics geology geochemistry and genesis of gold deposits %C Rotterdam %D 1991 %E Ladeira, E.A. %L fdi:34847 %G ENG %I Balkema %@ 90-6191-195-8 %K OR ; GITOLOGIE ; CALCAIRE ; GEOCHIMIE ; ALTERATION HYDROTHERMALE %K INCLUSION FLUIDE %K BRESIL ; GOIAS %K SANTA RITA %P 339-341 %U https://www.documentation.ird.fr/hor/fdi:34847 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34847.pdf %W Horizon (IRD) %B Brazil Gold' 91 : Symposium %8 1991/05/13-17 %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Pulz, G.M. %A Jost, H. %A Michel, D. %A Giuliani, Gaston %T The Archean Maria Lazara gold deposits, Goias, Brazil : example of Au-Bi-Te-S metallogeny related to shear zones intruded by synkinematic granitoids %B Brazil gold' 91 : the economics geology geochemistry and genesis of gold deposits %C Rotterdam %D 1991 %E Ladeira, E.A. %L fdi:34848 %G ENG %I Balkema %@ 90-6191-195-8 %K OR ; GITOLOGIE ; MINERALISATION ; GEOCHIMIE %K BRESIL ; GOIAS %K CRIXAS REGION ; MARIA LAZARA %P 385-387 %U https://www.documentation.ird.fr/hor/fdi:34848 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34848.pdf %W Horizon (IRD) %B Brazil Gold' 91 : Symposium %8 1991/05/13-17 %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Leonardos, O.H. %A Santos, M.D. %A Giuliani, Gaston %A Arujo, L.R. %T The Cumaru mesothermal granodiorite-hosted gold mineralization, Amazon craton, Brazil %B Brazil gold' 91 : the economics geology geochemistry and genesis of gold deposits %C Rotterdam %D 1991 %E Ladeira, E.A. %L fdi:34849 %G ENG %I Balkema %@ 90-6191-195-8 %K OR ; GITOLOGIE ; GRANITOIDE ; GEOCHIMIE ; ALTERATION HYDROTHERMALE ; PARAGENESE %K BRESIL ; PARA %K AMAZONIE ; REDENCAO REGION %P 557-562 %U https://www.documentation.ird.fr/hor/fdi:34849 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34849.pdf %W Horizon (IRD) %B Brazil Gold' 91 : Symposium %8 1991/05/13-17 %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Martins dos Santos, M. %A Giuliani, Gaston %A Touray, J.C. %A Dardenne, M.A. %A Guilhaumou, N. %A Beny, C. %T The gold quartz vein of Pontal, Tocantins, Brazil %B Brazil gold' 91 : the economics geology geochemistry and genesis of gold deposits %C Rotterdam %D 1991 %E Ladeira, E.A. %L fdi:34850 %G ENG %I Balkema %@ 90-6191-195-8 %K OR ; GITOLOGIE ; QUARTZ ; GEOCHIMIE ; MINERALISATION %K INCLUSION FLUIDE %K BRESIL %K TOCANTINS %P 585-591 %U https://www.documentation.ird.fr/hor/fdi:34850 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34850.pdf %W Horizon (IRD) %B Brazil Gold' 91 : Symposium %8 1991/05/13-17 %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Giuliani, Gaston %A Fortes, P.T. %A Nilson, A.A. %A Dardenne, M.A. %A Olivo, G.R. %A Ronchi, L.H. %A Santos, M.M. %A Marini, O.J. %T Contrasting archean-proterozoic-hosted gold deposit types and associated gold-bearing fluids %B Source, transport and deposition of metals %C Rotterdam %D 1991 %E Pagel %E Leroy %L fdi:43437 %G ENG %I Balkema %@ 90-5410-020-6 %K GEOCHIMIE ; OR ; GITOLOGIE ; MINERALISATION ; VARIATION SPATIALE %K BRESIL %P 665-668 %U https://www.documentation.ird.fr/hor/fdi:43437 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_39-40/43437.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Cheilletz, A. %A Féraud, G. %A Giuliani, Gaston %A Rodriguez, C.T. %T 40Ar/39Ar laser-probe dating of the Colombian emerald deposits : metallogenic implications %B Source, transport and deposition of metals %C Rotterdam %D 1991 %E Pagel %E Leroy %L fdi:43441 %G ENG %I Balkema %@ 90-5410-020-6 %K GEOCHIMIE ; MINERALISATION ; DATATION ABSOLUE ; METALLOGENIE %K EMERAUDE %K COLOMBIE %P 373-376 %U https://www.documentation.ird.fr/hor/fdi:43441 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_39-40/43441.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Pulz, G.M. %A Jost, H. %A Giuliani, Gaston %A Michel, D. %T Maria Lazara gold deposit (Goias State, Brazil) : an example of intense fluid/rock interaction associated with a triple point structure %C Rotterdam %D 1991 %E Pagel %E Leroy %L fdi:43442 %G ENG %I Balkema %@ 90-5410-020-6 %K GEOCHIMIE ; OR ; GITOLOGIE ; MINERALISATION %K BRESIL ; GOIAS %K MARIA LAZARA REGION %P 117-118 %U https://www.documentation.ird.fr/hor/fdi:43442 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_39-40/43442.pdf %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Coelho, C.E.S. %A Touray, J.C. %A Beny, C. %A Giuliani, Gaston %T Quartz fabrics and fluid inclusions volatiles at Fazenda Brasileiro gold mine : a preliminary petrographical and Raman microprobe study %D 1990 %L fdi:30936 %G ENG %J Bulletin de Liaison de la Société Française de Minéralogie et de Cristallographie %@ 0999-5870 %K OR ; MINERALOGIE ; GITOLOGIE %K INCLUSION FLUIDE ; SPECTROMETRIE RAMAN %K BRESIL ; BAHIA %K FAZENDA BRASILEIRO %N 1 %P 23 %U https://www.documentation.ird.fr/hor/fdi:30936 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/carton07/30936.pdf %V 2 %W Horizon (IRD) %B Réunion GEORAMAN %8 1989/05/17-19 %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Silva, L.J.H.D. %A Couto, P. %T Origin of emerals deposits of Brazil %D 1990 %L fdi:34825 %G ENG %J Mineralium Deposita %@ 0026-4598 %K GITOLOGIE ; METALLOGENIE ; MINERALISATION ; PARAGENESE ; PETROGRAPHIE ; MINERALOGIE %K EMERAUDE %K BRESIL %N 25 %P 57-64 %U https://www.documentation.ird.fr/hor/fdi:34825 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34825.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Rodriguez, C.T. %A Rueda, F. %T Les gisements d'émeraude de la Cordillère Orientale de la Colombie : nouvelles données métallogéniques %D 1990 %L fdi:34826 %G FRE %J Mineralium Deposita %@ 0026-4598 %K GITOLOGIE ; MINERALISATION ; METALLOGENIE ; ALTERATION HYDROTHERMALE %K EMERAUDE %K COLOMBIE %K ANDES %P 105-111 %R 10.1007/BF00208852 %U https://www.documentation.ird.fr/hor/fdi:34826 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34826.pdf %V 25 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Cheilletz, A. %A Zimmermann, J.L. %T The emplacement, geochemistry and petrogenesis of two central Morocco Hercynian granites : geotectonic implications %D 1990 %L fdi:36173 %G ENG %J Journal of African Earth Sciences %@ 0899-5362 %K GRANITE ; PALEOZOIQUE ; PETROGRAPHIE ; GEOCHIMIE ; COMPOSITION CHIMIQUE ; MINERALOGIE %K COMPOSITION ISOTOPIQUE %K MAROC %K AOUAM DJEBEL ; ZAER MASSIF %N 3-4 %P 617-629 %R 10.1016/0899-5362(89)90046-8 %U https://www.documentation.ird.fr/hor/fdi:36173 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/36173.pdf %V 9 %W Horizon (IRD) %$ 064PETRO %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Zimmermann, J.L. %A Giuliani, Gaston %T Comparaison des âges K-Ar des granites et des métasomatites à émeraudes de Campo Formoso et de Carnaiba (Bahia, Brésil) %B 13è Réunion des Sciences de la Terre %C Paris %D 1990 %L fdi:30970 %G FRE %I Société Géologique de France %@ 2-85363-053-6 %K GRANITE ; DATATION ABSOLUE ; K/AR ; MINERALISATION %K ARGON ; RB/SR %K BRESIL ; BAHIA %K CAMPO FORMOSO ; CARNAIBA %P 127 %U https://www.documentation.ird.fr/hor/fdi:30970 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_23-25/30970.pdf %W Horizon (IRD) %B Réunion des Sciences de la Terre %8 1990/04/2-4 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Araujo Filho, O. %T Padrao de terras raras dos granitoides de arturlandia e Quebra Rabicho (regiao de Pirenopolis-Goianesia, Goias) : relaçoes com a provincia estanifera de Goias %S 36 congresso brasileiro d geologia : boletim de resumos %C Sao Paulo %D 1990 %L fdi:35403 %G POR %I Sociedade Brasileira de Geologia %K GRANITOIDE ; GEOCHIMIE ; TERRES RARES %K FLUIDE MINERALISATEUR %K BRESIL %K ARTURLANDIA ; QUEBRA RABICHO %P 115 %U https://www.documentation.ird.fr/hor/fdi:35403 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/35403.pdf %W Horizon (IRD) %B Congresso Brasileiro de Geologia %8 1990/10/28; 1990/11/01 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Cheilletx, A. %A Triana Rodriguez, C. %T Genese das jazidas de Esmeralda da Colombia do Brasil %S 36 congresso brasileiro d geologia : boletim de resumos %C Sao Paulo %D 1990 %L fdi:35404 %G POR %I Sociedade Brasileira de Geologia %K GITOLOGIE ; MINERALOGIE ; PARAGENESE ; METASOMATISME %K EMERAUDE ; FLUIDE MINERALISATEUR %K COLOMBIE ; BRESIL %P 130 %U https://www.documentation.ird.fr/hor/fdi:35404 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/35404.pdf %W Horizon (IRD) %B Congresso Brasileiro de Geologia %8 1990/10/28; 1990/11/01 %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Santos, M.M. %A Dardenne, M.A. %A Guilhaumou, N. %A Giuliani, Gaston %A Beny, C. %A Touray, J.C. %T The metamorphogenic pontal gold deposit, Goias, Brazil : fluid evolution from mineralogical and fluid inclusion studies %D 1989 %L fdi:30935 %G ENG %J Terra Abstracts %@ 0954-4887 %K OR ; MINERALOGIE ; COMPOSITION CHIMIQUE %K INCLUSION FLUIDE ; GISEMENT METAMORPHOGENETIQUE %K BRESIL ; GOIAS %K BREJINHO DE NAZARE %P 27 %U https://www.documentation.ird.fr/hor/fdi:30935 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_23-25/30935.pdf %V 1 %W Horizon (IRD) %B International Symposium : Gold 89 in Europe %8 1989/05/23-25 %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Li, Y.D. %A Sheng, T.F. %T Fluid inclusion study of Xihuashan tungsten deposit in the southern Jiangxi province, China %D 1988 %L fdi:26214 %G ENG %J Mineralium Deposita %@ 0026-4598 %K QUARTZ ; GAZ CARBONIQUE ; COMPOSITION CHIMIQUE ; CARACTERISTIQUE PHYSIQUE ; MINERALISATION ; TUNGSTENE %K GRANITE JURASSIQUE ; INCLUSION FLUIDE ; PHASE PLUIDE ; HYDROTHERMALISME %K CHINE %K XIHUASHAN ; JIANGXI PROVINCE %P 24-33 %R 10.1007/BF00204224 %U https://www.documentation.ird.fr/hor/fdi:26214 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_18-19/26214.pdf %V 23 %W Horizon (IRD) %X Etude des inclusions fluides des filons de quartz du gisement de tungstène de Xihuashan (Province du Jiangxi, Chine) par microthermométrie et spectrométrie Raman. Les données obtenues permettent de retracer l'évolution hydrothermale du dépôt des minéralisations %$ 064GEOCHI %0 Unpublished Work %9 AP : Autres productions %A Giuliani, Gaston %T Rapport préliminaire des activités scientifiques réalisées dans le cadre de l'étude des gisements d'émeraude de la cordillère orientale de la Colombie : mission du 1 au 25 octobre 1988 %C Brasilia %D 1988 %L fdi:43456 %G FRE %I ORSTOM %K GEOCHIMIE ; GITOLOGIE ; EPIGENESE ; DISTRIBUTION SPATIALE ; MINERALISATION ; PARAGENESE %K EMERAUDE %K COLOMBIE %P 50 multigr. %U https://www.documentation.ird.fr/hor/fdi:43456 %W Horizon (IRD) %$ 064GEOCHI %0 Book Section %9 OS CH : Chapitres d'ouvrages scientifiques %A Cheilletz, A. %A Giuliani, Gaston %T Les skarns tungstifères stratiformes du Djebel Aouam (Maroc Central) : modèle de développement métasomatique en deux étapes %B Gissements métallifères dans leur contexte géologique %C Orléans %D 1988 %E Johan, Z. %E Ohnenstetter, D. %L fdi:30040 %G FRE %I BRGM %K SKARN ; TUNGSTENE ; METAMORPHISME ; METASOMATISME ; GITOLOGIE ; MINERALISATION ; COMPOSITION CHIMIQUE ; MINERALOGIE ; PETROGRAPHIE %K MAROC CENTRE ; AOUAM DJEBEL %N 158 %P 151-173 %U https://www.documentation.ird.fr/hor/fdi:30040 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_23-25/30040.pdf %V 1 %W Horizon (IRD) %X Les minéralisations rubanées stratiformes à scheelite-biotite du district polymétallique du Djebel Aouam (Maroc Central) sont interprétées comme le résultat de la formation de skarns par un mécanisme à deux étapes. Le modèle génétique présenté a permis la mise au point d'un schéma de prospection tactique de la minéralisation du tungstène %S Documents du BRGM %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Couto, P. %T Emerald deposits of Brazil and its genetic link with infiltrational metasomatic processes %S Geochemical evolution of the continental crust %C sl %D 1988 %L fdi:26736 %G ENG %I sn %K GITE ; METASOMATISME ; PRECAMBRIEN ; GRANITOIDE %K EMERAUDE ; BERYL ; PEGMATITE ; PHLOGOPITITE %K BRESIL %K SOCOTO ; CARNAIBA ; SANTA TEREZINHA DE GOIAS ; ITABIRA %P 236-246 %U https://www.documentation.ird.fr/hor/fdi:26736 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26736.pdf %W Horizon (IRD) %B Geochemical Evolution of the Continental Crust %8 1988/07/11-16 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Castelo Branco, R.M.G. %A Giuliani, Gaston %A Cheilletz, A. %A Clementelle, L. %T Os berilos verdes da regiâo de Coqui, minicipio de Quixeramobim novas ocorrencias de esmeraldas no estado do Cearâ %S Anais do 35 congresso brasileiro de geologia %C Sao Paulo %D 1988 %L fdi:26737 %G POR %I Sociedade Brasileira de Geologia %K GITE ; METASOMATISME ; ANALYSE CHIMIQUE %K EMERAUDE ; BERYL ; PEGMATITE ; ANFIBOLITE %K BRESIL %K COQUI ; QUIXERAMOBIM %P 383-397 %U https://www.documentation.ird.fr/hor/fdi:26737 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26737.pdf %V 1 %W Horizon (IRD) %B Congresso Brasileiro de Geologia %8 1988/11/06-13 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A El-Rey Silva, L.J. d' %A Giuliani, Gaston %T Controle estrutural da jazida de esmeraldas da Santa Terezinha da Goias : implicaçôes na genese, tectônica regional e no planejamento da lavra %S Anais do 35 congresso brasileiro de geologia %C Sao Paulo %D 1988 %L fdi:26738 %G POR %I Sociedade Brasileira de Geologia %K GITE ; GENESE ; METASOMATISME ; GEOLOGIE STRUCTURALE %K EMERAUDE ; BERYL ; PHLOGOPITITE ; CONTROLE TECTONIQUE %K BRESIL %K SANTA TEREZINHA DE GOIAS %P 413-427 %U https://www.documentation.ird.fr/hor/fdi:26738 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26738.pdf %V 1 %W Horizon (IRD) %B Congresso Brasileiro de Geologia %8 1988/11/06-13 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Dos Santos, R.A. %T Geoquimica de alguns granitoides da Faixa de Dobramentos Sergipana %S Anais do 35 congresso brasileiro de geologia %C Sao Paulo %D 1988 %L fdi:26739 %G POR %I Sociedade Brasileira de Geologia %K GRANITOIDE ; GEOCHIMIE ; ANALYSE CHIMIQUE ; TERRES RARES ; DIFFERENCIATION MAGMATIQUE ; MAGMATISME CALCOALCALIN %K BRESIL ; BAHIA ; SERGIPE %K SERGIPANA ZONE DE PLISSEMENTS %P 1037-1052 %U https://www.documentation.ird.fr/hor/fdi:26739 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26739.pdf %V 3 %W Horizon (IRD) %B Congresso Brasileiro de Geologia %8 1988/11/06-13 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A D'Avila Fernandés, P.C. %T The Archean and Proterozoic molybdenum mineralizations of the Bahia state, Brazil : metallogenetic implications %S Anais do 7 congresso Latino-Americano de geologia %C Sao Paulo %D 1988 %L fdi:26740 %G ENG %I Sociedade Brasileira de Geologia %K MOLYBDENE ; MINERALISATION ; GITE ; GRANITE ; METALLOGENIE %K MOLYBDENITE ; PEGMATITE %K BRESIL %K CAMPO FORMOSO ; CARNAIBA ; ITABERABA %P 230-242 %U https://www.documentation.ird.fr/hor/fdi:26740 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26740.pdf %V 1 %W Horizon (IRD) %B Congresso Latino-Americano de Geologia %8 1988/11/06-13 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Weisbrod, A. %T Scanning electron microscopy (SEM) and its applications : determination of solid and daughter minerals in fluid inclusions from some Brazilian emerald deposits %S Anais do 7 congresso Latino-Americano de geologia %C Sao Paulo %D 1988 %L fdi:26741 %G ENG %I Sociedade Brasileira de Geologia %K MINERALOGIE ; MICROSCOPIE ELECTRONIQUE A BALAYAGE ; GRANITOIDE ; METASOMATISME %K EMERAUDE ; BERYL ; PEGMATITE ; INCLUSION %K BRESIL %K CARNAIBA ; SOCOTO ; SANTA TEREZINHA DE GOIAS ; ITABERAI %P 445-458 %U https://www.documentation.ird.fr/hor/fdi:26741 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26741.pdf %V 1 %W Horizon (IRD) %B Congresso Latino-Americano de Geologia %8 1988/11/06-13 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Couto, P. %T O metassomatismo de infiltraçâo e sua importancia nos depositos de esmeralda do Brasil %S Anais do 7 congresso Latino-Americano de geologia %C Sao Paulo %D 1988 %L fdi:26742 %G POR %I Sociedade Brasileira de Geologia %K GITE ; METASOMATISME ; PRECAMBRIEN ; GRANITOIDE %K EMERAUDE ; BERYL ; PEGMATITE ; PHLOGOPITITE %K BRESIL %K CARNAIBA ; SOCOTO ; ITABIRA ; SANTA TEREZINHA DE GOIAS %P 459-475 %U https://www.documentation.ird.fr/hor/fdi:26742 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26742.pdf %V 1 %W Horizon (IRD) %B Congresso Latino-Americano de Geologia %8 1988/11/06-13 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Cheilletz, A. %A Giuliani, Gaston %T Epigenesis versus syngenesis : a contribution to the debate based on the stratiform tungsten skarn mineralizations of Djebel Aouam, central Morocco %S Proceedings of the seventh quadriennal IAGOD symposium %C Stuttgart %D 1988 %E Zachrisson, E. %L fdi:30091 %G ENG %I E. Schweizerbart'sche %K GISEMENT STRATIFORME ; TUNGSTENE ; SKARN ; MINERALISATION ; METAMORPHISME ; METASOMATISME %K PETROGENESE ; FLUIDE MINERALISATEUR %K MAROC CENTRE ; AOUAM DJEBEL %P 339-347 %U https://www.documentation.ird.fr/hor/fdi:30091 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_23-25/30091.pdf %W Horizon (IRD) %X Présentation du gisement stratiforme à scheelite-biotite du djebel Aouam (Maroc centre) et interprétation des processus ayant déterminé la minéralisation %B IAGOD Symposium %8 1986/08/18-22 %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Rudowski, Luc %A Giuliani, Gaston %A Sabaté, Pierre %T Les phlogopitites à émeraude au voisinage des granites de Campo Formoso et Carnaiba (Bahia, Brésil) : un exemple de minéralisation protérozoïque à Be, Mo et W dans des ultrabasites métasomatisées %D 1987 %L fdi:23889 %G FRE %J Comptes Rendus de l'Académie des Sciences.Série 2 : Mécanique... %@ 0249-6305 %K MINERALISATION ; METALLOGENIE ; METASOMATISME %K BERYL %K BRESIL ; BAHIA %K CAMPO FORMOSO ; CARNAIBA %N 18 %P 1129-1134 %U https://www.documentation.ird.fr/hor/fdi:23889 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_18-19/23889.pdf %V 304 %W Horizon (IRD) %$ 064GEOREG %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Cheilletz, A. %A Mechiche, M. %T Behaviour of REE during thermal metamorphism and hydrothermal infiltration associated with skarn and vein-type tyngstene ore bodies in Central Morocco %D 1987 %L fdi:26212 %G ENG %J Chemical Geology %@ 0009-2541 %K GEOCHIMIE ; TERRES RARES ; TUNGSTENE ; GITOLOGIE ; MINERALISATION %K METAMORPHISME HYDROTHERMAL ; GRANITE HERCYNIEN ; FLUIDE MINERALISATEUR %K MAROC CENTRE ; AOUAM DJEBEL %P 279-294 %R 10.1016/0009-2541(87)90008-8 %U https://www.documentation.ird.fr/hor/fdi:26212 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_18-19/26212.pdf %V 64 %W Horizon (IRD) %X Cet article présente une étude géochimique des terres rares de roches et de minerai du gisement du tungstène du djebel Aouam (Maroc central). La distribution des lanthanides dans les roches sédimentaires ne subit aucune modification importante au cours du méthamorphisme thermal. Par contre, les roches affectées par le méthamorphisme hydrothermal présentent d'importantes variations dans la composition en lanthanides. L'analyse de la distribution des terres rares montre que les fluides minéralisateurs dérivent probablement d'intrusions acides et spécialisées %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %T La cassitérite zonée du gisement de Sokhret Allal (granite des Zaër ; Maroc central) : composition chimique et phases fluides associées %D 1987 %L fdi:26213 %G FRE %J Mineralium Deposita %@ 0026-4598 %K MINERALOGIE ; COMPOSITION CHIMIQUE ; METALLOGENIE ; TUNGSTENE ; ETAIN %K GRANITE HERCYNIEN ; CASSITERITE ; INCLUSION FLUIDE ; ZONATION %K MAROC CENTRE ; SOKHRET ALLAL ; ZAER MASSIF %P 253-261 %R 10.1007/BF00204517 %U https://www.documentation.ird.fr/hor/fdi:26213 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_18-19/26213.pdf %V 22 %W Horizon (IRD) %X La composition chimique d'une cassitérite zonée provenant du gisement de tungstène-étain de Sokhret Allal (Maroc central) a été analysée par microsonde électronique. La zonation optique du minéral correspond à des variations en éléments mineurs tels Fe et Ti. Les inclusions fluides contemporaines du dépôt de la cassitérite sont primaires et constituées de fluides typiquement aqueux appartenant au système H2O-NaCl. La contribution de ces nouvelles données dans la métallogenèse W-Sn du Maroc central est discutée %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %T Fluid inclusion study from Xihuashan tungsten deposit in the South-Jiangxi province (China) %C Salvador %D 1987 %L fdi:23902 %G ENG %I Superintendência de Geologia e Recursos Minerais %K QUARTZ ; COMPOSITION CHIMIQUE ; TUNGSTENE %K INCLUSION FLUIDE ; CONDITION HYDROTHERMALE ; SPECTROMETRIE RAMAN ; MICROTHERMOMETRIE %K CHINE %K JIANGXI PROVINCE ; DAYU %P 235-239 %U https://www.documentation.ird.fr/hor/fdi:23902 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/doc34-07/23902.pdf %W Horizon (IRD) %B International Symposium on Granites and Associated Mineralizations %8 1987/01/21-31 %$ 064GEOCHI %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Rudowski, Luc %A Giuliani, Gaston %A Sabaté, Pierre %T The proterozoic granite massifs of Campo Formoso %C Salvador %D 1987 %L fdi:23903 %G ENG %I Superintendência de Geologia e Recursos Minerais %K MINERALISATION ; METASOMATISME ; PLUTONISME %K CONDITION HYDROTHERMALE %K BRESIL ; BAHIA %K CAMPO FORMOSO ; CARNAIBA %P 253-257 %U https://www.documentation.ird.fr/hor/fdi:23903 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/doc34-07/23903.pdf %W Horizon (IRD) %B International Symposium on Granites and Associated Mineralizations %8 1987/01/21-31 %$ 064GEOREG %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Sabaté, Pierre %A Mac Reath, Ian %A Giuliani, Gaston %T Plutonic associations of North-East, Bahia %C Salvador %D 1987 %L fdi:23904 %G ENG %I Superintendência de Geologia e Recursos Minerais %K PETROGRAPHIE ; CRATON ; MIGMATITE ; MINERALISATION ; CHAINE GEOSYNCLINALE ; INTRUSION ; METASOMATISME ; PLUTONISME %K OROGENIE TRANSMAZONIENNE ; OROGENIE BRESILIENNE %K BRESIL %K BAHIA ETAT %P 91-122 %U https://www.documentation.ird.fr/hor/fdi:23904 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/doc34-07/23904.pdf %W Horizon (IRD) %X Dans le but d'illustrer une excursion géologique, les auteurs décrivent les associations plutoniques du nord-est de l'Etat de Bahia. Ils abordent le cadre géologique régional et ils présentent les caractéristiques pétrologiques et structurales à l'échelle des nombreux affleurements. %B International Symposium on Granites and Associated Mineralizations %8 1987/01/21-31 %$ 064GEOREG %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Cheilletz, A. %T Caractéristiques géochimiques du pluton zoné des Zaër et des stocks granitiques du Djebel Aouam, Maroc central : modèle pétrogénétique %S Réunion annuelle des sciences de la terre %C Paris %D 1986 %L fdi:32054 %G FR %I Société Géologique de France %K GRANITOIDE ; PETROGRAPHIE ; MINERALOGIE ; GEOCHIMIE ; DIFFERENCIATION MAGMATIQUE ; METALLOGENIE %K MAROC CENTRE ; ZAER REGION ; DJEBEL AOUAM REGION %P 80 %U https://www.documentation.ird.fr/hor/fdi:32054 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_30-30/32054.pdf %W Horizon (IRD) %B Réunion Annuelle des Sciences de la Terre %8 1986/03/25-27 %$ 064PETRO %0 Conference Proceedings %9 ACTI : Communications avec actes dans un congrès international %A Giuliani, Gaston %A Weisbrod, A. %T Les minéralisations filoniennes stannowolframifères du massif des Zaër (Maroc central) %S Gisements de tungstène : métallogénie, exploration, minéralogie %C Toulouse %D 1986 %E Moine, B. %L fdi:26735 %G FRE %I Université Sabatier %K GEOCHIMIE ; GRANITE ; ALTERATION ; MINERALISATION %K GRANODIORITE %K MAROC CENTRE ; ZAER MASSIF %P 91-92 %U https://www.documentation.ird.fr/hor/fdi:26735 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26735.pdf %W Horizon (IRD) %B Colloque Européen : Gisements de Tungstène, Métallogénie, Exploration, Minéralogie %8 1986/05/12-14 %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %T Le gisement de tungstène de Xihuashan (Sud-Jiangxi, Chine) : relations granites, altérations deutériques-hydrothermales, minéralisations %D 1985 %L fdi:26220 %G FRE %J Mineralium Deposita %@ 0026-4598 %K GEOCHIMIE ; TUNGSTENE ; GITOLOGIE ; GRANITE ; MINERALISATION ; ALTERATION HYDROTHERMALE %K CHINE %K JIANGXI SUD ; XIHUASHAN REGION %P 107-115 %R 10.1007/BF00204320 %U https://www.documentation.ird.fr/hor/fdi:26220 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_18-19/26220.pdf %V 20 %W Horizon (IRD) %$ 064GEOCHI %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %T Les concentrations filoniennes à tungstène-étain du massif granitique des Zaërs (Maroc central) : minéralisations et phases fluides associées %D 1984 %L fdi:26610 %G FRE %J Mineralium Deposita %@ 0026-4598 %K GRANITE ; MINERALISATION ; TUNGSTENE ; FILON ; GEOCHIMIE %K INCLUSION %K MAROC CENTRE ; ZAER MASSIF ; SOKHRET ALLAL %N 19 %P 193-201 %U https://www.documentation.ird.fr/hor/fdi:26610 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26610.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %A Sonet, J. %T Contribution à l'étude géochronologique du massif granitique hercynien des Zaërs (Massif Central marocain) %D 1982 %L fdi:26608 %G FRE %J Comptes Rendus de l'Académie des Sciences.Série 2 : Mécanique... %@ 0249-6305 %K GRANITE ; GEOCHRONOLOGIE ; RADIOMETRIE ; GEOCHIMIE %K RB/SR ; COMPOSITION ISOTOPIQUE %K MAROC CENTRE ; ZAER MASSIF %N 2 %P 139-143 %U https://www.documentation.ird.fr/hor/fdi:26608 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26608.pdf %V 294 %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Cheilletz, A. %A Giuliani, Gaston %T Rôle de la déformation du granite dans la genèse des episyénites feldspathiques des massifs de Lovios-Geres (Galice) et des Zaërs (Maroc central) : relations avec les minéralisations en tungstène-étain associées %D 1982 %L fdi:26609 %G FRE %J Mineralium Deposita %@ 0026-4598 %K PETROLOGIE ; GRANITE ; MINERALISATION ; FILON ; ANALYSE STRUCTURALE ; TUNGSTENE ; ETAIN ; FELDSPATH %K PORTUGAL NORD ; LOVIOS GERES MASSIF ; MAROC CENTRE ; ZAER MASSIF %N 17 %P 387-400 %U https://www.documentation.ird.fr/hor/fdi:26609 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26609.pdf %W Horizon (IRD) %$ 064PETRO %0 Journal Article %9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES %A Giuliani, Gaston %T Découverte de minéralisations en Sn-W-Mo dans le pluton granitique hercynien des Zaërs (Massif Central marocain) %D 1980 %L fdi:26607 %G FRE %J Comptes Rendus de l'Académie des Sciences.Série D : Sciences Naturelles %@ 0249-6305 %K GRANITE ; MINERALISATION ; FILON ; TUNGSTENE %K MAROC CENTRE ; ZAER MASSIF %N 22 %P 1397-1399 %U https://www.documentation.ird.fr/hor/fdi:26607 %> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26607.pdf %V 290 %W Horizon (IRD) %$ 064PETRO