Alkaline Rocks and Carbonatites of the World

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Occurrence number: 
Longitude: 8.33, Latitude: 10.07

Only provisional mapping of this occurrence is available (Raeburn et al., 1927) which, together with photo-interpretation (Turner, 1979), indicates the presence of two overlapping intrusions of which, like Rishiwa (No. 122-00-018) immediately to the north, the more northerly centre appears to be the more complex. The southern intrusion is a granite with sodic amphibole (riebeckite or arfvedsonite?) as the sole mafic mineral, while the northern one is predominantly syenite with in the northeast a further elongate mass of granite. The syenite contains 'hornblende and soda-augite' (Raeburn et al., 1927). In the more northerly granite amphibole substitutes for biotite in some facies.

RAEBURN, C., BAIN, A.D.N. and RUSS, W. 1927. The tinfields of Zaria and Kano Provinces. Bulletin, Geological Survey of Nigeria, 11: 1-71.TURNER, D.C. 1979. Nigeria: the northern ring complexes. Geological map, scale 1:250,000. St Andrews University Younger Granite Research Group.
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