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7474025 
Journal Article 
Schistose rocks from Okene-Lokoja area, SW Nigeria 
Ezepue, MC; Odigi, MI 
1994 
1 
Journal of Mining and Geology
ISSN: 1116-2775 
30 
1 
1-9 
English 
Schistose rocks from Okene-Lokoja area, SW Nigeria, consist of quartz-biotite schist, quartz-muscovite schist, amphibole schist, and quartz schist. Major element compositions of the schists together with their trace element contents are presented. The schists are enriched in SiO2, K2O, Rb and Ba but depleted in total Fe2 O3, MnO, TiO2, MgO, Ni and Zn compared with rocks of similar composition from Ilesha (SW Nigeria) and other parts of the world. Petrochemical peculiarities suggest that the quartzitic schist is derived from sedimentary rocks (arkoses and arenites) whereas the other schists are considered to be pre-metamorphosed basic igneous rocks probably derived from magmas (with calc-alkaline/tholeiitic affinity) emplaced in a continental environment. -from Authors