Abstract
The source, evolution and geotectonic setting of structurally-controlled and spatially-related elliptical chains of Pan-African (Late Neoproterozoic) plutons were studied using field relationship, petrography and geochemistry. Results indicate that the association consists of igneous enderbites of quartzdioritic to granodioritic compositions and charnockites of monzonitic to granitic compositions trending in a regional N-S to NE-SW pattern within a granulite terrain in southern Obudu plateau. The enderbites form mainly prominent hills, while the charnockites occur more as relict boulders in the plains and river channels. Deformation has somewhat modified the primary textures of some of the charnockites. The two rock types show similarity with high Ba-Sr collisional granitoids, characterized by high K O/Na O ratios and they 22 document peraluminous (S-type) granitic magmatism at an active continental margin of the Andean-type between the West African and Benin-Nigerian plates during the Pan-African orogeny. The enderbites and charnockites probably formed in the lower crust at different water fugacity due to secondary hydration.
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