Geochemistry of tholeiitic basalts from the Nyos volcano in the Oku Volcanic Group (Cameroon Volcanic Line), west Africa: constraints on petrogenesis

Asobo N.E. Asaah; 横山 哲也; Festus T. Aka; 臼井 寛裕; Mengnjo J. Wirmvem; Boris Chako Tchamabe; 大場 武; Gregory Tanyileke; Joseph V. Hell

doi:10.14862/geochemproc.60.0.60.0

Abstracts of Annual Meeting of the Geochemical Society of Japan

Session ID : 1D10

DOI https://doi.org/10.14862/geochemproc.60.0.60.0

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Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

Geochemistry of tholeiitic basalts from the Nyos volcano in the Oku Volcanic Group (Cameroon Volcanic Line), west Africa: constraints on petrogenesis

*Asobo N.E. Asaah, Tetsuya Yokoyama, Festus T. Aka, Tomohiro Usui, Mengnjo J. Wirmvem, Boris Chako Tchamabe, Takeshi Ohba, Gregory Tanyileke, Joseph V. Hell

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Keywords: tholeiitic basalts, petrogenesis, Nyos Volcano, alkaline basalts

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Abstract

The Nyos volcano located in the Oku Volcanic Group (OKVG) of the CVL is unique because it hosts basanite and alkaline basalts in association with tholeiitic basalts. The aim of this study is to constrain the petrogenesis of these rock types from their geochemical characteristics. Similarity in Zr/Hf and Nb/Ta ratios of both alkaline and tholeiitic basalts strongly indicated their derivation from the same mantle source.

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