| Petrogenesis and geotectonic setting of the PanAfrican basement rocks in Bamenda Massif, Obudu Plateau, southeastern Nigeria： Evidence from trace element geochemistry |
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| 引用本文： | UKAEGBU V. U. EKWUEME B. N.. Petrogenesis and geotectonic setting of the PanAfrican basement rocks in Bamenda Massif, Obudu Plateau, southeastern Nigeria： Evidence from trace element geochemistry[J]. 中国地球化学学报, 2006, 25(2): 122-131. DOI: 10.1007/BF02872171 |
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| 作者姓名： | UKAEGBU V. U. EKWUEME B. N. |
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| 作者单位： | Department of Geology University of Port Harcourt Port Harcourt Nigeria，Department of Geology University of Calabar Calabar Nigeria |
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| 基金项目： | The authors are grateful to Dr Ibrahim Garba of the Department of Geology, Ahmadu Bello University, Zaria, Nigeria and Activation Laboratories, 0ntario, Canada, for their contributions to this work. |
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| 摘 要： | 1 IntroductionThe study area is part of the Obudu Plateau,which forms part of the Precambrian Pan-African tec-tonothermal belt, lying between the West African Cra-ton and the Gabon-Congo Craton ( Fig. 1). It isbounded by the Benue Trough, in the NE-SW axi…
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| 关 键 词： | 微量元素 岩石成因论 地壳构造 花岗岩 橄榄石 |
Petrogenesis and geotectonic setting of the Pan-African basement rocks in Bamenda Massif, Obudu Plateau, southeastern Nigeria: Evidence from trace element geochemistry |
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| V. U. Ukaegbu,B. N. Ekwueme. Petrogenesis and geotectonic setting of the Pan-African basement rocks in Bamenda Massif, Obudu Plateau, southeastern Nigeria: Evidence from trace element geochemistry[J]. Chinese Journal of Geochemistry, 2006, 25(2): 122-131. DOI: 10.1007/BF02872171 |
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| Authors: | V. U. Ukaegbu B. N. Ekwueme |
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| Affiliation: | (1) Department of Geology, University of Port Harcourt, Port Harcourt, Nigeria;(2) Department of Geology, University of Calabar, Calabar, Nigeria |
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| Abstract: | The rocks of the Obudu Plateau range from high-grade metagreywacke-pelite sequence to metaigneous (granitic to tholeiitic) and polymagmatic (calc-alkaline granitic to olivine tholeiitic) igneous rocks. Several co-variance diagrams and other parameters indicate that the trace elements of rocks in southern Obudu Plateau exhibit systematic variations and suggest highly heterogeneous protoliths. The tectonic setting of the rocks indicates rifting and collisional to non-orogenic emplacements in oceanic to ensialic environments. The calc-alkaline and tholeiitic nature of the magmatism as well as the greywacke-pelite sequence is suggestive of an Andean-type continental environment. |
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| Keywords: | trace element Pan-African petrogenesis geotectonic Obudu Plateau |
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