Age and isotopic studies of some Pan-African granites from North-Central Nigeria |
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| Authors: | O Van Breemen RT Pidgeon P Bowden |
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| Institution: | 1. Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow, G75 OQU Scotland;2. Department of Geology, The University, St. Andrews, Fife Scotland |
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| Abstract: | Twenty-nine Rb-Sr whole-rock isotopic analyses and three U-Pb zircon analyses on foliated granites and largely unfoliated charnockitic rocks indicate that the central part of the Pan-African belt in west Africa was characterised by intense orogenic plutonism. These data and Rb-Sr analyses on muscovite books from late cross-cutting pegmatites indicate that the peak of magmatic activity occurred 610 ± 10 m.y. ago.Initial 87Sr/86Sr ratios for the granitic and charnockitic rocks are in the range 0.7065–0.7125, and indicate a significantly older crustal component in the magmas. |
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