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Sedimentary evolution and stratigraphy of the similar to ~765-740 Ma Kansuki-Mwashya platform succession in the Tenke-Fungurume Mining District, Democratic Republic of the Congo
Mambwe, P.; Delpomdor, F.; Lavoie, S.; Mukonki, P.; Batumike, J.; Muchez, P. (2020). Sedimentary evolution and stratigraphy of the similar to ~765-740 Ma Kansuki-Mwashya platform succession in the Tenke-Fungurume Mining District, Democratic Republic of the Congo. Geol. Belg. 23(1-2): 69-85. https://hdl.handle.net/10.20341/gb.2020.022
In: Geologica Belgica. Geologica Belgica: Brussels . ISSN 1374-8505; e-ISSN 2034-1954, more
Peer reviewed article  
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Author keywords
    Kansuki-Mwashya platform, Katanga Supergroup, lithofacies analysis, sequence stratigraphy, Sturtian glaciation
Authors  Top 
  • Mambwe, P., more
  • Delpomdor, F., more
  • Lavoie, S.
  • Mukonki, P.
  • Batumike, J.
  • Muchez, P., more
Abstract
    The origin of the Mwashya Conglomerate at the base of the Mwashya Subgroup in the Lufilian Belt is uncertain since it is considered as either a tectonic or as a sedimentary breccia. At Tenke Fungurume Mining District (TFMD) in the Democratic Republic of the Congo, the Mwashya Conglomerate is marked by an iron-bearing polymictic conglomerate embedded between the Kansuki and Kamoya formations. In this paper, the Kansuki-Mwashya platform succession at TFMD was investigated to shed light on the origin of this conglomerate, the depositional evolution and the tectonostratigraphic framework of the platform. Lithofacies analysis revealed that the Mwashya Conglomerate is a periglacial olistostrome, which was formed around ~765–745 Ma. A pre-Sturtian age for this conglomerate is supported by the Kamoya Formation, which is here interpreted as a post-glacial cap carbonate sequence. The Kansuki-Mwashya platform succession consists of a protected coastal lagoon adjacent to a tidal flat environment, both bordered by a barrier shoal. This paper concludes that the Kansuki-Mwashya platform succession was driven by rifting pulses, occurring gravity flows on instable slope, superimposed upon the ~750–717 Ma long-lasting Sturtian glacial period.
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