Provenance and Geological Setting of Syncollisional Pan-African Granite in the Northern Part Birnin Gwari Schist Belt in NW Nigeria
The origin and geologic setting of syn-collisional granite in the northern section of the Birnin Gwari schist belt were investigated in order to contribute to a better understanding of the geodynamic development of Nigerian schist belts. Granite dominates, with minor amounts of granodiorite and quartzolite. The biotite-hornblende granite (quartzolite – BHG), the biotite granite (BG), and the biotite-muscovite granite (BMG) were discovered using petrographic and geochemical data (BMG). The rocks contain calc-alkalic to alkali-calcic, peraluminous, ferroan, and magnesian geochemistry, as well as calc-alkalic to alkali-calcic, peraluminous, ferroan, and magnesian affinities. LILE enri is what distinguishes them. With mild to moderate negative Eu (Eu/Eu* = 0.38 to 0.62) and significant negative Nb, P, and Ti anomalies, the LREE fractionation factor [(La/Yb) (6.74 to 45.14) is high. The behaviour of lithophile elements (Ba, Sr, and Rb) indicated a variety of granite trends, including “high and low Ba-Sr,” “normal,” “anomalous,” “highly differentiated,” and “granodiorite and quartz diorite.” Their trace element and REE profiles are comparable, implying that they are cogenetic. Data on major and minor elements In volcanic arc and post-collisional settings, show differentiation of a mafic magma and partial melting of crustal components inherited from shale-greywacke and quartzose sedimentary protoliths. The granite’s field and geochemical properties show that it is similar to granites found in schist belts in other parts of Nigeria, indicating that it is part of the same Pan-African magmatic belt.
Author (S) Details
Department of Geology, Ahmadu Bello University Zaria, Nigeria.
Department of Lithospheric Research, University of Vienna, Austria.
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