Petrochemistry and geotectonic setting of granitic rocks in Aderan Area, SW Nigeria
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Date
2013
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Publisher
Canadian Center of Science and Education
Abstract
Aderan area, southwestern Nigeria is underlain by metaigneous and metasedimentary rocks which have been
intruded by granitic rocks of probable Pan-African (ca. 600 Ma) age. Four types of granitic rocks have been
identified in the area, including granitic gneisses, medium-grained granite, porphyritic granite and granodiorite.
Geochemical analysis show that the rocks are largely calc-alkaline. The granodiorite is less siliceous and more
calcic, and also contains less Ba, Nb and Rb, and more Sr, Ce and La than the granites. Tectonically, the rocks
classify as volcanic arc and syn-collisional and possibly late-to- post-collisional granitic rocks with respect to the
Pan-African orogeny. Chemical characteristics indicate that these rocks were derived from partial melting of
mafic to semi-pelitic (metasedimentary) crustal rocks under conditions of intermediate oxygen fugacity and
activities of H2O
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Keywords
granitic rocks, petrochemistry, tectonic setting, Pan-African orogeny, Aderan area