Alkaline Rocks and Carbonatites of the World

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Mont Koupe

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Occurrence number: 
030-00-028
Country: 
Cameroon
Location: 
Longitude: 9.72, Latitude: 4.78

Completely surrounded by basaltic lavas of Manengouba (No. 26), which lies to the north, Mont Koupe consists predominantly of quartz syenites with a little gabbro on the northern margin and minor granite. The syenites consist of abundant quartz, perthite and, in various combinations, arfvedsonite, riebeckite, aegirine and biotite.

Age: 
A Rb-Sr whole rock isochron gave 46.4(1 Ma (Lasserre, 1978).
References: 
GÈZE, B. 1953. Les volcans du Cameroun occidental. Bulletin Volcanologique, 13: 63-92.LASSERRE, M. 1978. Mise au point sur les granitoides dits "ultimes" du Cameroun: gisement, pétrographie et géochronologie. Bulletin du Bureau de Recherches Géologiques et Minières. Paris, IV: 143-59.
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith