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7482732 
Journal Article 
Petrology and gold mineralization of the amphibolite belt, Ilesha area, southwestern Nigeria 
Elueze, AA 
1986 
65 
3 
189-195 
English 
The Ilesha amphibolite belt is composed of metasedimentary rocks and a mafic complex comprising mostly amphibolites and amphibole schists, with intercalations of talc bodies. These assemblages occur within a polycyclic basement of largely ancient gneisses and migmatites, and underlie alluvial Au deposits. Auriferous quartz veins are known to be emplaced along structural elements in the amphibolite complex. It is believed that the alluvial Au deposits were derived from weathered auriferous veins and veinlets. Sulfur contents of the amphibolites and amphibole schists are relatively high, supporting the occurrence of sulfides, possibly in relation to primary Au. The mafic units are magmatic and are therefore considered the ultimate source of the vein-type Au deposits. On the basis of overall geological and geochemical characteristics, it is suggested that the mineralization was linked to metamorphic-hydrothermal processes.-from Author 
GOLD DEPOSITS - Geochemistry; ORE DEPOSITS - Nigeria; AMPHIBOLITE BELT; GOLD MINERALIZATION; PETROLOGY