Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

Publications des scientifiques de l'IRD

Belley P. M., Dzikowski T. J., Fagan A., Cempirek J., Groat L. A., Mortensen J. K., Fayek M., Giuliani Gaston, Fallick A. E., Gertzbein P. (2017). Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin island, Nunavut, Canada. Canadian Mineralogist, 55 (4), 669-699. ISSN 0008-4476

Accès réservé (Intranet IRD) Document en accès réservé (Intranet IRD)

Lien direct chez l'éditeur doi:10.3749/canmin.1700018

Titre
Origin of scapolite-hosted sapphire (corundum) near Kimmirut, Baffin island, Nunavut, Canada
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000406369600008
AuteursBelley P. M., Dzikowski T. J., Fagan A., Cempirek J., Groat L. A., Mortensen J. K., Fayek M., Giuliani Gaston, Fallick A. E., Gertzbein P.
SourceCanadian Mineralogist, 2017, 55 (4), p. 669-699. ISSN 0008-4476
RésuméGem-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.
Plan de classementGéologie et formations superficielles [064]
Descr. géo.CANADA
LocalisationFonds IRD [F B010070893]
Identifiant IRDfdi:010070893
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010070893

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Nouméa

Papeete

Niamey

Ouagadougou

Tunis

La Paz

Quito