[ Étude des occurrences kimberlitiques de Kabimba par approche géophysique (aeromagnetisme et gravimétrique) ]
Volume 65, Issue 1, February 2023, Pages 82–97
Hippolyte MUTOMBO1, Télesphore Mayiba2, and Crispin Musambayi3
1 Université Officielle de Mbujimayi, RD Congo
2 Université officielle de Mbuji-Mayi, RD Congo
3 Université Officielle de Mbujimayi, 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.
Rocks in the Earth’s crust can be characterized by measurable physical properties such as magnetic susceptibility, density, electrical resistivity. Geophysical methods are appropriate for measuring the contrast of these properties inside the earth. This contrast represents, among other things, a variation in the structural. The development of new geophysical data acquisition tools and techniques makes it possible to considerably increase the quality/quantity of data and, on the other hand, to reduce operating costs and implementation time. These data, beyond their quality, however require adequate processing to be usable in geological interpretation. The geological map depicts a window into the internal structure of the earth. It is the first tool used in the exploration of natural resources. Since the majority of the earth’s surface is covered by sediments and vegetation, it is important to develop other technologies that can map geology through this cover. We processed airborne magnetic data to interpret the geology of the study area. The aim of this research is to process the airborne magnetic data on Kabimba to identify anomalies, then confirm the lithological cause of each by core drilling. This determines the lithostratigraphic at the points of the geophysical anomalies. The drilling declines the true underground geology through the information provided by the cores which reflect the geological formations crossed. Two kimberlite occurrences have been highlighted in this site. They have a pipe-like structure and contain green to red kimberlite under a carbonate casing topped by Cretacic sandstone and Kalahari sand.
Author Keywords: Aeromagnetic surveys, gravimetrics, geological mapping, Kimberlitic, drilling.
Volume 65, Issue 1, February 2023, Pages 82–97
Hippolyte MUTOMBO1, Télesphore Mayiba2, and Crispin Musambayi3
1 Université Officielle de Mbujimayi, RD Congo
2 Université officielle de Mbuji-Mayi, RD Congo
3 Université Officielle de Mbujimayi, 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
Rocks in the Earth’s crust can be characterized by measurable physical properties such as magnetic susceptibility, density, electrical resistivity. Geophysical methods are appropriate for measuring the contrast of these properties inside the earth. This contrast represents, among other things, a variation in the structural. The development of new geophysical data acquisition tools and techniques makes it possible to considerably increase the quality/quantity of data and, on the other hand, to reduce operating costs and implementation time. These data, beyond their quality, however require adequate processing to be usable in geological interpretation. The geological map depicts a window into the internal structure of the earth. It is the first tool used in the exploration of natural resources. Since the majority of the earth’s surface is covered by sediments and vegetation, it is important to develop other technologies that can map geology through this cover. We processed airborne magnetic data to interpret the geology of the study area. The aim of this research is to process the airborne magnetic data on Kabimba to identify anomalies, then confirm the lithological cause of each by core drilling. This determines the lithostratigraphic at the points of the geophysical anomalies. The drilling declines the true underground geology through the information provided by the cores which reflect the geological formations crossed. Two kimberlite occurrences have been highlighted in this site. They have a pipe-like structure and contain green to red kimberlite under a carbonate casing topped by Cretacic sandstone and Kalahari sand.
Author Keywords: Aeromagnetic surveys, gravimetrics, geological mapping, Kimberlitic, drilling.
Abstract: (french)
Les roches de la croûte terrestre peuvent être caractérisées par des propriétés physiques mesurables telles que la susceptibilité magnétique, la densité, la résistivité électriques. Les méthodes géophysiques sont appropriées pour mesurer le contraste de ces propriétés à l’intérieur de la terre. Ce contraste représente entre autres une variation de la structurale. Le développement des nouveaux outils et de nouvelles techniques d’acquisition de données géophysiques permet d’accroitre considérablement la qualité/quantité des données et, d’autres part, de diminuer les coûts d’exploitation et le temps de mise en œuvre. Ces données au-delà de leur qualité, nécessitent toutefois des traitements adéquats pour être utilisables dans l’interprétation géologique. La carte géologique représente une fenêtre de la structure interne de la terre. Elle est le premier outil utilisé dans l’exploration des ressources naturelles. Du fait que la majorité de la surface de la terre est recouverte par les sédiments et la végétation, il est important de valoriser d’autres technologies susceptibles de cartographier la géologie à travers cette couverture. Nous avons traité les données magnétiques aéroportées afin d’interpréter la géologie de la zone d’étude. Le but de cette recherche est de traiter les données magnétiques aéroportées sur Kabimba pour en dégager des anomalies, puis confirmer la cause lithologique de chacun par le forage carottant. Celui-ci détermine la lithostratigraphique aux points des anomalies géophysiques. Le forage décline la vraie géologie souterraine à travers les informations fournies par les carottes qui elles, reflètent les formations géologiques traversées. Deux occurrences kimberlitiques ont été mise en évidence dans ce site. Elles ont une structure en forme de pipes et contiennent une kimberlite verte à rouge sous un encaissant carbonaté surmonté par le grès Crétacique et le sable du Kalahari.
Author Keywords: Levés aéromagnétiques, gravimétriques, cartographie géologique, Kimberlitique, forage.
How to Cite this Article
Hippolyte MUTOMBO, Télesphore Mayiba, and Crispin Musambayi, “Study of Kabimba kimberlite occurrences by geophysical approach (aeromagnetism and gravimetric),” International Journal of Innovation and Scientific Research, vol. 65, no. 1, pp. 82–97, February 2023.
