Palaeogene Sandstones of the Manika Plateau in Kolwezi (DR Congo): Sedimentological and Geochemical Characterization, Provenance, Palaeoalteration and Tectonic Context  

Palaeogene Sandstones of the Manika Plateau in Kolwezi (DR Congo): Sedimentological and Geochemical Characterization, Provenance, Palaeoalteration and Tectonic Context

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作  者:Pierre T. Mashala Faidance Mashauri Samy M. Malango Christian K. Mulopwe Pierre T. Mashala;Faidance Mashauri;Samy M. Malango;Christian K. Mulopwe(Department of Geology, University of Lubumbashi, Haut-Katanga, DR Congo;Department of Geology, University of Ul, Haut-Ul, DR Congo;Department of Geology and Technology, University of Kolwezi, Lualaba, DR Congo)

机构地区:[1]Department of Geology, University of Lubumbashi, Haut-Katanga, DR Congo [2]Department of Geology, University of Ul, Haut-Ul, DR Congo [3]Department of Geology and Technology, University of Kolwezi, Lualaba, DR Congo

出  处:《Open Journal of Geology》2024年第7期705-722,共18页地质学期刊(英文)

摘  要:This work presents a study of the Paleogene sandstones of the Manika plateau in Kolwezi, DR Congo. These sandstones belong to the “Grès polymorphes” group, which together with the overlying “Sables ocre” makes up the Kalahari Supergroup. Sedimentological and geochemical analyses have enabled us to characterize these sandstones and determine their origin, the conditions of their formation and the tectonic context in which they were developed. The results show that the sandstones are quartz arenites with a high level of mineralogical, textural and chemical maturity. They are recycled sandstones, formed in an intracratonic sedimentary basin, in the context of a passive continental margin, after a long fluvial transport of sediments. These sandstones initially come from intense alteration of magmatic rocks with felsic composition, mainly tonalite-trondhjemite-granodiorite (TTG) complexes, in hot, humid palaeoclimatic conditions and oxidizing environments.This work presents a study of the Paleogene sandstones of the Manika plateau in Kolwezi, DR Congo. These sandstones belong to the “Grès polymorphes” group, which together with the overlying “Sables ocre” makes up the Kalahari Supergroup. Sedimentological and geochemical analyses have enabled us to characterize these sandstones and determine their origin, the conditions of their formation and the tectonic context in which they were developed. The results show that the sandstones are quartz arenites with a high level of mineralogical, textural and chemical maturity. They are recycled sandstones, formed in an intracratonic sedimentary basin, in the context of a passive continental margin, after a long fluvial transport of sediments. These sandstones initially come from intense alteration of magmatic rocks with felsic composition, mainly tonalite-trondhjemite-granodiorite (TTG) complexes, in hot, humid palaeoclimatic conditions and oxidizing environments.

关 键 词:Sandstone SEDIMENTOLOGY Geochemistry Palaeoalteration Tectonic Context Manika Plateau DR Congo 

分 类 号:P61[天文地球—矿床学]

 

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