@article{fdi:010080541,
  title = {{C}rystalline inliers near {L}ake {I}ro ({SE} {C}had) : post-collisional {E}diacaran {A}(2)-type granitic magmatism at the southern margin of the {S}aharan {M}etacraton},
  author = {{C}ouzinie, {S}. and {M}enot, {R}. {P}. and {D}oumnang, {J}. {C}. and {P}aquette, {J}. {L}. and {R}ochette, {P}. and {Q}uesnel, {Y}. and {D}eschamps, {P}ierre and {M}enot, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he structure and evolution of the continental crust in the southern part of the {S}aharan {M}etacraton (central {A}frica) is poorly known due to extensive laterite and sediment cover as well as geographic isolation. {W}e report on a series of five crystalline inliers newly discovered near {L}ake {I}ro (south-eastern {C}had) that offered the opportunity to unravel the nature of the local basement in this area. {T}wo spatially determined petrographic types are exposed in the inliers: a medium-grained porphyritic amphibole-biotite granite and a biotite microgranite with typical embayed (rhyolitic) quartz phenocrysts, both containing fine-grained melanocratic igneous enclaves. {S}ome porphyritic granites display evidence for low temperature deformation along {N}60 shear zones. {T}he {L}ake {I}ro igneous rocks are typified by their ferroan mineralogy, define a ferman alkali-calcic metaluminous to weakly peraluminous potassic association, and exhibit elevated {HFSE} ({Z}r, {N}b, {Y}) and {REE} contents. {T}herefore, they are best classified as {A}(2)-type granites. {T}hey are variably ferromagnetic with total magnetization lower than 1 {A}/m. {T}he {L}ake {I}m granites most likely correspond to a single subvolcanic-plutonic silicic complex because: (i) firstorder geochemical modelling indicates that the microgranites can be generated by 30% fractional crystallization of a two feldspar-amphibole assemblage from a porphyritic granite melt and (ii) both granite types yield zircon {U}-{P}b emplacement ages consistent within a 575.3 +/- 5.6 to 581.3 +/- 3.8 {M}a time frame. {T}he {L}ake {I}ro granites thus represent the oldest of a series of post-collisional igneous associations exposed in southern {C}had and nearby countries which, collectively, show that the amalgamation of the constituent blocks of the southern {S}aharan {M}etacraton is older than 580 {M}a.},
  keywords = {{A}-type granites ; {P}ost-collisional magmatism ; {S}aharan metacraton ; {P}an-african orogeny ; {S}outhern {C}had ; {TCHAD} ; {SAHARA}},
  booktitle = {},
  journal = {{J}ournal of {A}frican {E}arth {S}ciences},
  volume = {172},
  numero = {},
  pages = {103960 [18 ]},
  ISSN = {1464-343{X}},
  year = {2020},
  DOI = {10.1016/j.jafrearsci.2020.103960},
  URL = {https://www.documentation.ird.fr/hor/fdi:010080541},
}