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

By
M.I. Teitchou
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
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
R. Temdjim
Département des Sciences de la Terre, Université de Yaoundé-1, B.P. 812 Yaoundé, Cameroon
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R.T. Ghogomu
R.T. Ghogomu
Département des Sciences de la Terre, Université de Yaoundé-1, B.P. 812 Yaoundé, Cameroon
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C. Ngwa
C. Ngwa
Institut de Recherches Géologiques et Minières, IRGM/ARGV Ekona, B.P. 370 Buéa, Cameroon
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F.T. Aka
F.T. Aka
Institut de Recherches Géologiques et Minières, IRGM/ARGV Ekona, B.P. 370 Buéa, Cameroon
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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 metasomatic features observed in both groups of samples are related to more or less alkaline—and carbonated—mafic silicate melts. These melts are related to the magmatic activity of the Cameroon volcanic line, leading in particular to the eruption of the host lava xenoliths.

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GSA Special Papers

Volcanism and Evolution of the African Lithosphere

Luigi Beccaluva
Luigi Beccaluva
Dipartimento di Scienze della Terra, Università di Ferrara, Italy
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Gianluca Bianchini
Gianluca Bianchini
Dipartimento di Scienze della Terra, Università di Ferrara, Italy
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Marjorie Wilson
Marjorie Wilson
School of Earth & Environment, The University of Leeds, Leeds, UK
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Geological Society of America
Volume
478
ISBN print:
9780813724782
Publication date:
June 01, 2011

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