Abstract
Analysis of high resolution of aeromagnetic data was carried out over Lamurde, Adamawa state north-eastern Nigeria to determine the Curie point depth (CPD), heat flow and geothermal gradient. The aeromagnetic data used for this work was obtained at Nigerian geological survey agency, the total magnetic intensity was processed to produce the residual magnetic map which was divided into 4 overlapping blocks, each block was subjected to spectral analyses to obtain depths to the top boundary and centroid, while depth to bottom of the magnetic sources was calculated using empirical formula. The depths values obtained were then used to assess the CPD, heat flow and geothermal gradient in the area. The result shows that the CPD varies between 9.62 and 10.92 km with an average of 10.45 k, the heat flow varies between 150.73 and 132.78 mWm−20⋅°C−1 with an average of 139.12 mWm−20⋅°C−1 and the geothermal gradient in the study area varies between 12.16 and 15.67 °C/km with an average of 13.39 °C/km. In view of the above results, the high heat flow may be responsible for maturation of hydrocarbon in Benue Trough as well as responsible for the lead Zinc Mineralization. Again by implication, Lamurde area can be a good area for geothermal reservoir exploration for an alternative source for power generation.
Highlights
IntroductionThis research work aimed at estimation of Curie Point Depth (CPD), heat flow and geothermal gradient in Lamurde and Environs, North-Eastern Nigeria, by analysis of high resolution aeromagnetic data
The aeromagnetic data used for this work was obtained at Nigerian geological survey agency, the total magnetic intensity was processed to produce the residual magnetic map which was divided into 4 overlapping blocks, each block was subjected to spectral analyses to obtain depths to the top boundary and centroid, while depth to bottom of the magnetic sources was calculated using empirical formula
This research work aimed at estimation of Curie Point Depth (CPD), heat flow and geothermal gradient in Lamurde and Environs, North-Eastern Nigeria, by analysis of high resolution aeromagnetic data
Summary
This research work aimed at estimation of Curie Point Depth (CPD), heat flow and geothermal gradient in Lamurde and Environs, North-Eastern Nigeria, by analysis of high resolution aeromagnetic data. One of the tools used in investigating thermal structure of crust via aeromagnetic studies is spectral analysis. Several studies have shown that magnetic data can be used to determine the thermal structure of the earth’s crust in various geologic environments [1] [2] [3], for example, dominant magnetic minerals in the earth crust change from being ferromagnetic to paramagnetic at a temperature known as Curie Point Temperature (CPT). At temperature above CPT, the thermal agitation of the ferromagnetic rock material leads to the spontaneous alignment of the different domains in the minerals and becomes randomized to the point that ferromagnetic minerals become totally paramagnetic [5]
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