Ni-Co sulphide segregation in the Mamb pyroxenite intrusion, Cameroon

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• 作者：Charles Nkoumbou ; Fré ; dé ; ric Villié ; ras ; Pierre Barbey ; Clé ; ment-Yonta Ngoune ; Robert Joussemet ; Fré ; dé ; ric Diot ; Daniel Njopwouo ; Jacques Yvon
• 关键词：Pyroxenite ; Sulphide ; Ni-Co mineralization ; Cameroon
• 刊名：Comptes Rendus Geoscience
• 出版年：2009
• 出版时间：July 2009
• 年：2009
• 卷：341
• 期：7
• 页码：517-525
• 全文大小：913 K

文摘

The amphibole metapyroxenite intrusion from Mamb (Cameroon) consists of enstatite, diopside-augite, edenite, and traces of plagioclase, biotite and rutile. It contains notable amounts of sulphides (pyrrhotite, pentlandite, chalcopyrite, pyrite and Co-rich violarite). The sulphide phase segregated during magma crystallization as immiscible droplets (≤ 1 mm) included in growing ferromagnesian minerals or aggregated in the silicate crystal mush to form an interstitial phase. However, observed sulphide assemblages are likely to result from low-T (≤ 300 °C) re-equilibration of high-T monosulphide solid solutions, more particularly during the Pan-African metamorphic event. The Mamb amphibole pyroxenite intrusion is tentatively considered as a potential source for Ni and Co mineralization.