Découverte des roches à affinité ophiolitique dans la chaîne panafricaine au Cameroun : les talcschistes de Ngoung, Lamal Pougue et Bibodi Lamal |
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| Authors: | Charles Nkoumbou Clment Yonta Goune Frdric Villiras Daniel Njopwouo Jacques Yvon Georges Emmanuel Ekodeck Flix Tchoua |
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| Institution: | aDepartment of Earth Sciences, Faculty of Science, The University de Yaoundé I, P.O. Box 812, Yaoundé, Cameroon;bLaboratoire « Environnement et minéralurgie » (UMR 7569, CNRS & INPL), École nationale supérieure de géologie, BP 40, 54501 Vandoeuvre-lès-Nancy cedex, France;cDépartement de chimie inorganique, faculté des sciences, université Yaoundé-1, BP 812, Yaoundé, Cameroun |
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| Abstract: | Outcrops of talc schists extending over >1 km have been discovered within the garnet- and muscovite-bearing mica schist of the Pan-African belt near Yaoundé (Cameroon). Mineralogical studies show that a metamorphism of the upper greenschist facies was prolonged by hydrothermal reactions. This latter led to the transformation of hornblendites into talc schists. Chemically, talc schists and relicts of hornblendite remind ultrabasic rocks, and REE patterns point to E-MORB and peridotite. It is thus suggested that the talc schists and relicts of hornblendite may correspond to slices of a dismembered Pan-African ophiolite set. To cite this article: C. Nkoumbou et al., C. R. Geoscience 338 (2006). |
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