Alkaline Rocks and Carbonatites of the World

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Dutsen Wai (Duchin Wei)

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Occurrence number: 
122-00-015
Country: 
Nigeria
Location: 
Longitude: 8.22, Latitude: 10.92

This intrusion, just over 3 km in diameter, is expressed as a group of small hills. Most of the intrusion is occupied by biotite granite, which underlies most of the high ground. It is made of perthite, a little albite, quartz and fluorite. In places the granite is cut by quartz veins which carry minor cassiterite (Raeburn et al., 1927). Post-dating the biotite granite is a riebeckite granite which is highly variable and often pegmatitic. Riebeckite, which may form centimetre-long prisms, is commonly intergrown with aegirine and there is generally plentiful pyrochlore and cryolite, which has usually been altered, possibly to thomsenolite. A narrow zone of explosion breccia is located along part of the southern margin and consists of fragments of basement rocks.

Economic: 
Alluvial cassiterite was mined for some years.
Age: 
Rb-Sr determinations on biotite granite gave 173(3 and 177(3 Ma (Rahaman et al., 1984).
References: 
JACOBSON, R.R.E. and MACLEOD, W.N. 1977. Geology of the Liruei, Banke and adjacent younger granite ring-complexes. Bulletin, Geological Survey of Nigeria, 33: 1-117.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.RAHAMAN, M.A., VAN BREEMEN, O., BOWDEN, P. and BENNETT, J.N. 1984. Age migrations of anorogenic ring complexes in northern Nigeria. Journal of Geology, 92: 173-84.
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