Geochemistry of calc-alkaline volcanics in northwestern Nigeria,and a possible Pan-African suture zone |
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Authors: | Patricia McCurry J.B. Wright |
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Affiliation: | Department of Earth Sciences, The Open University, Milton Keynes Great Britain |
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Abstract: | Major and trace element characteristics of dacites and rhyolites overlying and intruding basement rocks in northwestern Nigeria most closely resemble those of intracontinental orogenic volcanic associations. REE patterns point to a deep-seated source for the magmas, perhaps involving garnet fractionation at mantle depths and low-pressure plagioclase fractionation. The occurrence of calc-alkaline volcanics, small basic-ultrabasic complexes and major transcurrent faulting, is consistent with the presence of a Pan-African suture zone in northwestern Nigeria. |
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