[ Sédimentologie et paléoenvironnement de carbonates des carrières de Bena Kabongo de Mbuji-Mayi (Province du Kasaï Oriental, R.D. Congo) ]
Volume 37, Issue 4, October 2022, Pages 830–843
Patrick Mukonkole Mukonkole1, Giresse Kabemba Kalonji2, Hénock Tshombe Mbaya3, Serge Diemo4, and Anthony Lubanzadio Sevuanga5
1 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
2 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
3 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
4 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
5 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
Original language: French
Copyright © 2022 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This work consists of a sedimentological and paleoenvironment study of the carbonate rocks of the Mbuji-Mayi Supergroup dated to the Neoproterozoic of the Bena Kabongo quarries. Macroscopically, two lithofacies have been determined, namely: limestone and dolomite. Field observations show us that the base of the sequence is dominated by dark fine-grained limestones. The summit part is represented by fine-grained gray limestones that alternate with brownish dolomite. Based on seven thin sections, a microscopic observation was carried out and allowed us to detect three microfacies, namely: intrasparites, intramicrites and intraclastics, all representing a standard sequence of the sedimentary series. This sequence shows the evolution of the deposit going from a subtidal zone to an intertidal zone. Analysis of the microfacies of the sequence shows that the strata were accumulated on an internal ramp in the shallower and more oxidizing conditions with stromatolitic flora.
Author Keywords: Mbuji-Mayi Supergroup, Neoproterozoic, BIId and BIIe subgroups, Diagenesis, microfaciès, lithofaciès, limestone, subtidal zone.
Volume 37, Issue 4, October 2022, Pages 830–843
Patrick Mukonkole Mukonkole1, Giresse Kabemba Kalonji2, Hénock Tshombe Mbaya3, Serge Diemo4, and Anthony Lubanzadio Sevuanga5
1 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
2 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
3 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
4 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
5 Centre de Recherches Géologiques et Minières (CRGM), B.P.: 898, Kinshasa I, RD Congo
Original language: French
Copyright © 2022 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This work consists of a sedimentological and paleoenvironment study of the carbonate rocks of the Mbuji-Mayi Supergroup dated to the Neoproterozoic of the Bena Kabongo quarries. Macroscopically, two lithofacies have been determined, namely: limestone and dolomite. Field observations show us that the base of the sequence is dominated by dark fine-grained limestones. The summit part is represented by fine-grained gray limestones that alternate with brownish dolomite. Based on seven thin sections, a microscopic observation was carried out and allowed us to detect three microfacies, namely: intrasparites, intramicrites and intraclastics, all representing a standard sequence of the sedimentary series. This sequence shows the evolution of the deposit going from a subtidal zone to an intertidal zone. Analysis of the microfacies of the sequence shows that the strata were accumulated on an internal ramp in the shallower and more oxidizing conditions with stromatolitic flora.
Author Keywords: Mbuji-Mayi Supergroup, Neoproterozoic, BIId and BIIe subgroups, Diagenesis, microfaciès, lithofaciès, limestone, subtidal zone.
Abstract: (french)
Ce travail consiste en une étude sédimentologique et paléoenvironnementale des roches carbonatées du Supergroupe de Mbuji-Mayi daté du Néoprotérozoïque des carrières de Bena Kabongo. Macroscopiquement, deux lithofaciès ont été déterminés à savoir: le calcaire et la dolomie. Les observations de terrain nous montrent que la base de la séquence est dominée par les calcaires sombres à grains fins. La partie sommitale est représenté par les calcaires gris à grains fins qui alternent avec la dolomie brunâtre. Sur base de sept lames minces, une observation microscopique a été mené et nous a permis de déceler trois microfaciès à savoir: les intrasparites, les intramicrites et les intraclastiques représentant tous une séquence standard de la série sédimentaire. Cette séquence montre l’évolution du dépôt allant d’une zone subtidale vers une zone intertidale. L’analyse des microfaciès de la séquence montre que les strates ont été accumulées sur une rampe interne dans les conditions moins profondes et plus oxydants à flore stromatolitique.
Author Keywords: Supergroupe de Mbuji-Mayi, Néoprotérozoïque, Sous-groupes BIId et BIIe, diagenèse, microfaciès, lithofaciès, calcaire, zone subtidale.
How to Cite this Article
Patrick Mukonkole Mukonkole, Giresse Kabemba Kalonji, Hénock Tshombe Mbaya, Serge Diemo, and Anthony Lubanzadio Sevuanga, “Sedimentology and paleoenvironment of carbonates from the Bena Kabongo quarries of Mbuji-Mayi (Eastern Kasaï Province, D.R. Congo),” International Journal of Innovation and Applied Studies, vol. 37, no. 4, pp. 830–843, October 2022.
