Abstract
Twelve sheets of aeromagnetic and aeroradiometric data covered the study area. The data was used to investigate heat sources. The aeromagnetic data were combined to form a composite map- total magnetic intensity (TMI) anomaly map and aeroradiometric data of each radio-element were combined to produce the radioelements maps. Regional-residual separation of the total magnetic intensity data was performed using polynomial fitting method on the aeromagnetic data. The filtered residual data was Fourier transformed after dividing the whole area into thirty-five overlapping sections for spectral analysis, to determine Curie point depth, geothermal heat flow and magnetic trends. Calculation of ratios was used for the radio-elements to estimate the radioactive heat values in the study area, and the surface geology of the study area was delineated to outline each rock unit to match their density and corresponding radio-elements. The results of the analysis of aeromagnetic data showed that the shallow magnetic source ranges from 0.59 to 3.86 km, deeper source ranges from 8.03 to 19.85 km, Curie point depth values ranges from 14.64 to 38.62 km and geothermal heat flow values ranges between 37.54 and 99.02 mWm-2. The results of the analysis of the radioactive heat production of the study area range between 0.01 and 5.43 μWm-3. The highest heat produced was from the Shale with radioactive heat production as high as 5.43 μWm-3. There are high geothermal heat flow and radioactive heat values in Aimeke and Ogobia. Key words: Aeromagnetic, aero-radiometric, radioactive, geothermal.
Highlights
Aeromagnetic and aeroradiometric data were used to correlate the geothermal heat flow and radioactive heat production of the Anambra basin to ascertain if area with high geothermal heat flow values corresponds with that of the radioactive heat production
The total magnetic intensity (TMI) in the area is in the range of 300 to 225 nT, and is characterized by short-wavelength, medium-wavelength and long-wavelength anomalies
The range of the TMI quite agrees with the work of Anudu et al (2014) stating that the range of the TMI in the middle Benue Trough is in the range of -370 to 270 nT
Summary
Aeromagnetic and aeroradiometric data were used to correlate the geothermal heat flow and radioactive heat production of the Anambra basin to ascertain if area with high geothermal heat flow values corresponds with that of the radioactive heat production. Curie point depth was used to calculate the geothermal heat flow because of its importance in earth science (Artemieva et al, 2001; Megwara et al, 2012). The radioactive heat map was interpreted to know productive area based on the geographic projection of important towns. The digitized and georeferenced geological map of the study area outlined the rocks' boundaries.
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