[ Analyse structurale des formations carbonatées d’âges protérozoïque dans le secteur de Mpumbu au Sud-Ouest de Mbuji-Mayi (Kasaï-Oriental, RD Congo) ]
Volume 65, Issue 1, February 2023, Pages 70–81
Crispin Musambayi1, Télesphore Mayiba2, Albert KALAU3, Divin Tshimanga4, Elie TSHINGULI5, Maclin Kabemba6, Seth NTUMBA7, Mersa KABANGU8, and Sabbat Munyemba9
1 Université Officielle de Mbujimayi, RD Congo
2 Université officielle de Mbuji-Mayi, RD Congo
3 Licencié en Géologie, Chef des travaux à l’ISTA Kolwezi, Section Géologie et Mines, RD Congo
4 Université de Lubumbashi, RD Congo
5 Université de Kolwezi, Fac. Sciences, Dép. de Géologie, RD Congo
6 Université officielle de Mbujimayi, RD Congo
7 Institut Supérieur Pédagogique, Katanda, RD Congo
8 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
9 Géologue et chercheur indépendant, RD Congo
Original language: French
Copyright © 2023 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.
One of the main objectives of structural geology is to describe the different microstructures, to understand the origin and distribution of the forces that generated them on the spatio-temporary level. Building on this momentum, a structural study was carried out on geological formations of Proterozoic age in the locality of Mpumbu, Lupatapata territory, Kasai Oriental province of the Democratic Republic of the Congo. This area is mainly crisscrossed by sedimentary formations belonging to the Bushimay supergroup. This sedimentary sequence is unaffected by regional metamorphism while highlighting two distinct successive components: sedimentary and metamorphic. The locality of Mpumbu is full of the following formations: sandstone, dolomitic limestone and shale. Brittle and planar deformations affect the majority of rocks and attest to the compressive stresses typical of this terrain. We solved the problem using Win-tensor software. Two preferential orientations of breaks have been exposed: North-South and East-West. The stress study revealed that the main stress initiating the observed deformations is oriented N57° and is inclined by 3°. Apart from the deformation, a chronological study was revealed: the breaks oriented preferably East-West intersected or often offset by a North-South oriented detachment prove their anteriorities compared to the last. Finally, a slight tilt to the north or northwest of different Mpumbu formations indicates that the region has undergone a certain inclination to the tertiary during the kimberlite intrusion of the various kimberlites in the perimeter of Bakwanga.
Author Keywords: Deformations, carbonates, Proterozoic, Bushimay, Mpumbu.
Volume 65, Issue 1, February 2023, Pages 70–81
Crispin Musambayi1, Télesphore Mayiba2, Albert KALAU3, Divin Tshimanga4, Elie TSHINGULI5, Maclin Kabemba6, Seth NTUMBA7, Mersa KABANGU8, and Sabbat Munyemba9
1 Université Officielle de Mbujimayi, RD Congo
2 Université officielle de Mbuji-Mayi, RD Congo
3 Licencié en Géologie, Chef des travaux à l’ISTA Kolwezi, Section Géologie et Mines, RD Congo
4 Université de Lubumbashi, RD Congo
5 Université de Kolwezi, Fac. Sciences, Dép. de Géologie, RD Congo
6 Université officielle de Mbujimayi, RD Congo
7 Institut Supérieur Pédagogique, Katanda, RD Congo
8 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
9 Géologue et chercheur indépendant, RD Congo
Original language: French
Copyright © 2023 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
One of the main objectives of structural geology is to describe the different microstructures, to understand the origin and distribution of the forces that generated them on the spatio-temporary level. Building on this momentum, a structural study was carried out on geological formations of Proterozoic age in the locality of Mpumbu, Lupatapata territory, Kasai Oriental province of the Democratic Republic of the Congo. This area is mainly crisscrossed by sedimentary formations belonging to the Bushimay supergroup. This sedimentary sequence is unaffected by regional metamorphism while highlighting two distinct successive components: sedimentary and metamorphic. The locality of Mpumbu is full of the following formations: sandstone, dolomitic limestone and shale. Brittle and planar deformations affect the majority of rocks and attest to the compressive stresses typical of this terrain. We solved the problem using Win-tensor software. Two preferential orientations of breaks have been exposed: North-South and East-West. The stress study revealed that the main stress initiating the observed deformations is oriented N57° and is inclined by 3°. Apart from the deformation, a chronological study was revealed: the breaks oriented preferably East-West intersected or often offset by a North-South oriented detachment prove their anteriorities compared to the last. Finally, a slight tilt to the north or northwest of different Mpumbu formations indicates that the region has undergone a certain inclination to the tertiary during the kimberlite intrusion of the various kimberlites in the perimeter of Bakwanga.
Author Keywords: Deformations, carbonates, Proterozoic, Bushimay, Mpumbu.
Abstract: (french)
L’un des grands objectifs de la géologie structurale est celui de décrire les différentes microstructures, de comprendre l’origine et la distribution des forces les ayant engendrées sur le plan spatio-temporaire. Partant de cette lancée, une étude structurale a été réalisée sur les formations géologiques d’âge protérozoïque dans la localité de Mpumbu, territoire de Lupatapata, dans la province du Kasaï oriental en République démocratique du Congo. Ces formations géologiques sont principalement sédimentaires et appartiennent au super groupe de Mbujimayi qui est une séquence sédimentaire non affecté par le métamorphisme régional et se composant de deux successions distinctes la série inferieure BI et la série supérieure BII dont le sommet est coiffé avec les venues basaltiques posterieures. Le site étudié regorge les formations géologiques telles que le grès, le calcaire dolomitique et le shale. Les déformations cassantes planaires affectant les roches de cette localité attestent les phases compressives qu’a connu cette région, comme l’étude des contraintes effectuée à l’aide du logiciel Win-tensor le confirme. Deux orientations préférentielles des cassures se recoupant (N-S et E-W) expliqueraient deux phases de déformation locales qui, chronologiquement, les cassures orientées préférentiellement E-W recoupées et souvent décalées ou décrochées par celles orientées N-S semblent antérieures aux dernières. L’étude des contraintes a révélé que la contrainte principale initiatrice des déformations observées est orientée N57°E et est inclinée de 3°. L’ensemble des observations décrites et analysées plaident au rattachement de l’origine de ces cassures aux faibles basculements que la région a subi et ayant incliné la région vers le Nord ou le Nord-Ouest ainsi qu’à l’intrusion kimberlitique qui a eu lieu dans le périmètre de Bakwanga au tertiaire.
Author Keywords: Déformations, carbonatées, protérozoïque, Bushimay, Mpumbu.
How to Cite this Article
Crispin Musambayi, Télesphore Mayiba, Albert KALAU, Divin Tshimanga, Elie TSHINGULI, Maclin Kabemba, Seth NTUMBA, Mersa KABANGU, and Sabbat Munyemba, “Structural analysis of carbonate formations of Proterozoic age in the Mpumbu sector South-West of Mbuji-Mayi (Kasaï-Oriental, DR Congo),” International Journal of Innovation and Scientific Research, vol. 65, no. 1, pp. 70–81, February 2023.
