Alkaline Rocks and Carbonatites of the World

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Kofai And Shona


Occurrence number: 
Longitude: 9.27, Latitude: 10.02

The small complex of Kofai may represent a southerly continuation of the Kwandonkaya intrusion (No. 122-00-028) being separated from it by only about 1 km of migmatitic basement rocks. As in Kwandonkaya there are no alkaline rocks. In the core of the complex are gabbros and microgabbros which are net-veined by granites. These rocks are enveloped by later intrusions of biotite granite. Biotite granite also outcrops at Shona Hill 3 km to the south.

BUCHANAN, M.S., MACLEOD, W.N., TURNER, D.C., BERRIDGE, N.G. and BLACK, R. 1971. The geology of the Jos Plateau. Volume 2, Younger granite complexes. Bulletin, Geological Survey of Nigeria, 32: 1-159.
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