Applied Geophysics
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Applied Geophysics
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Item CURIE DEPTH AND GEOTHERMAL GRADIENT FROM SPECTRAL ANALYSIS OF AEROMAGNETIC DATA OVER UPPER ANAMBRA AND LOWER BENUE BASIN, NIGERIA.(Nigeria Journal of Technological research, 2017) ADETONA, Adebayo Abbass, SALAKO, K.A and Rafiu A.AA high amount of heat flow from a shallow curie depth is essentially related to a promising geothermal resource. This work explores the depth of demagnetisation due to high radiogenic heat content of the basement rocks. The Total Magnetic Intensity and the radiometric data, consisting of the Potassium count, the Uranium and Thorium equivalents, were employed for the research work. Sheet 145 (Kajuru) and 146 (Geshere) both on latitude 10°00'N to 10°30'N and longitude 7°30'E to 8°30'E covering 6,050 km2 within Kaduna State of Central Nigeria is an area with notedly high concentrations of these radionuclide by previous researchers. A shallow Curie point depth of 8.43 km was observed below Wugana while heat flow values ranging from 81.9 mW/m2 to 171.9 mW/m2 was estimated with an average of 167.8 mW/m2. Also, the geothermal gradients varied from 32.76 to 68.8 0CKm-1, with an average value of 67.16 0CKm-1. The effect of heat generated from the Potassium count, equivalent concentrations of Uranium and Thorium indicated the Northern end down to the Mid-western end displays medium to high radiogenic heat production. In conclusion, areas with low Currie depth that coincide with relatively high radiogenic heat production are located within Wugana, New Kwasan, and down to Ron villages, which are generally located at the Mid-North and Mid-Western areas with intrusive granitic rocksItem Assessment of Geothermal Potential of Parts of Middle Benue Trough, North-East Nigeria(Journal of the Earth and Space Physics, 2020) ADETONA, Adebayo Abbass, Salako K. A.Rafiu A.A., Alhassan U.D, Aliyu A and Adewumi TAbstract This research deals with assessment of geothermal potential in parts of middle Benue Trough, north-east of Nigeria. The study area lies within the Longitude 9°E – 10°E and Latitude 8°N – 9.50°N with an estimated total area of 18,150 km2 . Regional/Residual separation was performed on the total magnetic intensity using polynomial fitting. The residual map was divided into 14 overlapping spectral blocks, and the log of spectral energies were plotted against frequency. Centroid depth and depth to top boundary obtained were used to estimate the Curie point depth isotherm, which was then used to compute geothermal heat flow of the study area. The result shows that the geothermal heat flow varies between 50.02 and 85.1 mWm-2 with highest value in the southern part (Akiri and Ibi) and north-western part (Pankshin) of the area. The geothermal heat flow obtained from this study indicates that the study area possess a good source of geothermal potential. The aero-radiometric data covering the study area was also analysed to estimate the radiometric heat contribution. The analysis of aero-radiometric data shows that the area possesses high content of Uranium, Potassium and Thorium. The radioactive heat production values vary between 1.58 μW/m3 and 2.53 μW/m3 with an average of 2.21 μW/m3. Thus, harnessing the geothermal potential in this area would be of added values and advantage to power generation in Nigeria