Interpretation of Gravity Data and Contribution in the Structural Study of the Southern Part of the Congo Basin: Case of the Kasaï Region in D.R. Congo


Authors : Eli-Achille Manwana Mfumukani; Franck Tondozi Keto; Robert Muanda Ngimbi; Emmanuel Bahati Wenda; AnscaireMukange Besa; Reagan Lotutala Tazi; Olivier Muhingy Sawa-Sawa

Volume/Issue : Volume 7 - 2022, Issue 9 - September

Google Scholar : https://bit.ly/3IIfn9N

Scribd : https://bit.ly/3UJn1Yw

DOI : https://doi.org/10.5281/zenodo.7114886

The Kasai region is an area historically known for its wealth in minerals such as diamonds and gold. This study aims to study the structural geology of the northern part of the Kasai province in the D.R. Congo in order to guide future mining and oil prospecting. The analysis of the gravity data using the regional-residual separation method, the vertical and horizontal derivatives as well as the estimation of the depth of the sources of the anomalies by the Euler deconvolution method allowed us to identify and study several gravity signatures that can be associated with geological structures of economic interest. Thanks to the results obtained, we have produced structural maps in which all the identified geological structures have been well defined. The northern part of this zone is occupied by a gigantic high gravity while the southern part, for its part, is characterized by several gravity depressions. By analyzing the gravity maps of this area, we found that the structure of our study area is arranged in Horst (uplifted part in the north) and grabens (subsided part in the south). This interpretation is all the more supported by the fact that the anomaly contrast between these two structures is very clear, which could indicate the presence of a series of faults oriented in the NW-SE direction. Several gravimetric signatures representing structures that can promote the migration and trapping of hydrocarbons such as faults, antiform folds and salt domes have also been identified in this part. The southern part of the zone is located around the Archean rocks of the Kasaï craton which is very rich in minerals. Negative anomalies could be associated with diamondiferous kimberlite intrusions that are abundant in the region while positive anomalies could reveal the concentration of economically important metal ores.

Keywords : gravimetry, geology, structure, mine, oil, Kasai region.

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