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Volcanism and Evolution of the African Lithosphere

GSA Special Papers

Volcanism and Evolution of the African Lithosphere

Author(s)

Geological Society of America

Volume

478

DOI:

https://doi.org/10.1130/SPE478

Copyright:

© 2011 Geological Society of America

Attribution: You must attribute the work in the manner specified by the author or licensor (but no in any way that suggests that they endorse you or your use of the work). Noncommercial - you may not use this work for commercial purpose. No Derivative works - You may not alter, transform, or build upon this work. Sharing - Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.

ISBN print:

9780813724782

Publication date:

June 01, 2011

Book Chapter

Mineralogical and geochemical fingerprints of mantle metasomatism beneath Nyos volcano (Cameroon volcanic line)

Author(s)

M.I. Teitchou

Institut de Recherches Géologiques et Minières, IRGM/ARGV Ekona, B.P. 370 Buéa, Cameroon, and Département des Sciences de la Terre, Université de Yaoundé-1, B.P. 812 Yaoundé, Cameroon

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M. Grégoire

GET–UMR 5562 (Géosciences-Environnement-Toulouse–Unité Mixte de Recherche 5562), Observatoire Midi Pyrénées, Université de Toulouse-3, 14, avenue Édouard-Belin, 31400 Toulouse, France

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R. Temdjim

Département des Sciences de la Terre, Université de Yaoundé-1, B.P. 812 Yaoundé, Cameroon

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R.T. Ghogomu

Département des Sciences de la Terre, Université de Yaoundé-1, B.P. 812 Yaoundé, Cameroon

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C. Ngwa

Institut de Recherches Géologiques et Minières, IRGM/ARGV Ekona, B.P. 370 Buéa, Cameroon

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F.T. Aka

Institut de Recherches Géologiques et Minières, IRGM/ARGV Ekona, B.P. 370 Buéa, Cameroon

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Doi:

https://doi.org/10.1130/2011.2478(10)

Published:

June 01, 2011

Basaltic lavas of Nyos volcano (Cameroon) mostly contain mantle peridotite xenoliths consisting of spinel-bearing lherzolites and harzburgites. Based on the trace-element patterns, especially rare earth element (REE) patterns, two groups of samples have been distinguished: group 1 samples are characterized by spoon-shaped REE patterns, and group 2 samples show light (L) REE–enriched patterns. Mineralogical characteristics together with major- and trace-element compositions point to a low degree of partial melting (less than 5%) and metasomatic processes. The latter mechanism explains in particular the LREE content of bulk rocks and clinopyroxenes and the occurrence of hydrous minerals in some samples. All the...

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