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Basic magmatism and geotectonic evolution of the Pan African belt in central Africa: Evidence from the Katangan and West Congolian segments |
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| Authors: | AB Kampunzu D Kapenda B Manteka |
| Institution: | a Laboratoire de Pétrologie Magmatique, URA 1277 CNRS, Université of Aix-Marseille III, 13397, Marseille Cedex 13, France b Laboratoire de Pétrologie et de Géologie Africaine, Université de Lubumbashi B.P. 1825, Lubumbashi, Zaïre, South Africa |
| Abstract: | In the West Congolian and Katangan Pan African belts, late Proterozoic extensional tectonics related to the relaxation phase that followed the Kibaran collision ca. 1000 Ma ago evolved to reach a mature rift stage characterized by the E-MORB from Kimbungu (Bas-Zaire) in the Pan African West Congolian belt and Kibambale (Shaba, Zaire) in the Pan African Katangan belt. These mature rifts (proto-oceans) closed during the Pan African orogenic event, in an embryonic collision between the Kalahari craton to the south and the Congo craton to the north. This embryonic collisional belt differs from the classical ones in the lack of subduction and collision magmatic associations. This difference is attributed to the limited extent of the collision (slight crustal thickning) and, notably, to the fact that it happened before the underthrust plate reached the minimum depth required to generate calc-alkaline magmas through subduction. |
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