Alkaline Rocks and Carbonatites of the World

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Kofai And Shona

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Occurrence number: 
122-00-029
Country: 
Nigeria
Location: 
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.

References: 
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.
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