Geochemistry and Tectonic Setting of Mafic Igneous Units in the Neoproterozoic Katangan Basin, Central Africa: Implications for Rodinia Break-up |
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| Authors: | AB Kampunzu F Tembo G Matheis D Kapenda P Huntsman-Mapila |
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| Institution: | 1. Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong;2. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Northern Taibai Str. 229, Xi''an 710069, China;3. Guangdong Provincal Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China;4. Key Laboratory of Orogenic Belt and Crust Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;5. Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;1. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. Department of Earth Sciences, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon;3. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. College of Geosciences, China University of Petroleum, Beijing 102249, China;3. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;4. Faculty of Science, Universiti Brunei Darussalam, Gadong BE1410, Brunei Darussalam;5. Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Hobart, Tasmania 7001, Australia;6. School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;7. Key Laboratory of Computational Geodynamics, College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Geochemical compositions of mafic igneous rocks in the Katangan basin in Central Africa (Democratic Republic of Congo, hereafter Congo, and Zambia) provide the basis for the geodynamic interpretation of the evolution of this Neoproterozoic basin located between the Congo and Kalahari cratons. The Katangan basin is subdivided into five major tectonic units: the Katangan Aulacogen, the External Fold and Thrust Belt, the Domes Region, the Synclinorial Belt and the Katangan High. The metamorphosed mafic igneous rocks investigated occur in the Katangan Aulacogen, the External Fold and Thrust Belt and the Domes Region. The earliest magmatic activity produced continental tholeiites emplaced on Paleoproterozoic crust during the early stages of intraplate break-up. This continental tholeiite magmatism was followed by an association of alkaline and tholeiitic basalts emplaced in the Katangan continental rift and then by tholeiitic basalts with E-MORB affinity marking a young oceanic crust. These volcanic associations mark different stages of evolution from pre-rift continental break-up up to a continental rift similar to the East African rift system and then to a Red Sea type incipient oceanic rift. A similar evolution occurs in the Damaran basin in southwestern Africa, although no pre-rift continental tholeiites have been recorded in this segment of the Pan-African belt system. |
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| Keywords: | Mafic igneous rocks Neoproterozoic extension Rodinia break-up Katangan rift Africa |
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