Li,F and Rb contents and Ba/Rb and Rb/Sr ratios as indicators of postmagmatic alteration and mineralization in the granitic rocks of the Banke and Ririwai Younger Granite complexes,Northern Nigeria |
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Authors: | S J Ekwere |
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Institution: | 1. Department of Geology, University of Calabar, Calabar, Nigeria
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Abstract: | The Banke and Ririwai complexes have plutonic phases of igneous activity composed mainly of granitic rocks. These granitic ring complexes are associated with Sn-Nb mineralization and are characterized by high Li, F and Rb contents and Rb/Sr ratios, and low Ba and Sr contents and Ba/Rb ratios. — The altered and mineralized granites have variable Rb/Sr and Ba/Rb ratios differing significantly from those of fresh rocks. These ratios as well as the Li, F and Rb concentrations are good indicators of granitic rocks associated with postmagmatic alteration and mineralization providing valuable tools for Sn-Nb exploration within the Nigerian Younger Granite province. |
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