Abstract
A gravity and magnetic study has been carried out along the continental part of the Cameroon Volcanic Line (CVL), with the aim to explore the possibility of ore’s presence into the basement of this region. Different processing techniques have been applied, including the isostatic residual, the analytic signal and the Euler deconvolution to compute the Bouguer and magnetic anomalies. Following Euler solutions (result of Euler deconvolution) and the analytic signal results, four profiles crossing main structures on the isostatic residual have been used to enhance the structure of intrusions in the studied area. Despite the lack of constraints in the studied region, the results show that the basement is intruded by bodies of different density (2.57 g/cm3 to 2.87 g/cm3), different size and shape, with depths between 1 and 10 kilometers. These bodies have been interpreted as old rocks then as potential reservoirs of rare ores. In addition, volcanic rocks modeled have constituted potential reserves of other ores like graphite, sulfur, copper, iron.
Highlights
To get the main aim of this study, isostatic separation has been applied to gravity data to obtain the isostatic residual
The analytic signal and Euler deconvolution have been applied to magnetic data as it was needed on one hand to identify and locate magnetic sources on the surface and on the other hand to get an idea about depths of these sources underground
The Bouguer gravity anomalies transformed into isostatic residual gravity anomalies showed that the study area can be split in two main regions: the South-West part characterized by anomalies of great wavelength with strong intensity and the Adamawa region part, overall characterized by a large mass defect crossed by denser Y bodies shaped forward NE direction
Summary
The Cameroon volcanic line (CVL) has been the subject of experiences and intense scientific studies, combining origin and tectonic activity. The absence of sufficient age progression and the occurrence of sporadic magma rise along the CVL volcanic centers have favored different models for the origin of the CVL including: 1) Edge-driven convection along the northwestern flank of the Congo Craton [5] [6] [7], 2) remelting of fossil plume [8], 3) plume-plume interaction [9], and 4) decompression melting under reactivated shear zones [10] Despite this intense geophysical and geological activity, there is limited knowledge regarding the presence of deep magnetic rocks or possible ore deposits.
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