Evaluation of sedimentary thickness and Curie point depths in the eastern part of Bornu Basin, North-Eastern Nigeria

Abstract

The Curie point depth is the depths at which subsurface temperature (approximately 580 oC) loses spontaneous magnetization within the rock units and magnetic minerals show features of paramagnetic susceptibility. In this research work sedimentary thickness and Curie point depths of the eastern parts of Bornu basin were investigated. The aeromagnetic data was subdivided into twenty-five (25) overlapping blocks, and each block was analyzed to obtain depth to basement (Zt) of the magnetic sources and depth to centroid (Zo). The depth values were then used to estimate CPD and Curie temperature (𝜃) within the study area. The result shows that the depth to basement (Zt) varies between 2.55 and 7.4 km, with an average value of 5.96 km, the depth to centroid (Zo) values varies between 8.4 and 14.15 km with an average value of 11.08 km, the CPD values varies between 15.11 and 19.0 km with an average value of 16.20 km.