Subsurface Structural Characterization as Deduced from High-Resolution Aeromagnetic Data over The Confluence Zones in Central, Nigeria

This study aimed to delineate the intrusion body that controls structural setting and formation around river Niger-Benue confluence zone with particular attention its solid mineral potentials, this is achieved in mapping subsurface features through analysis of recent high-resolution aeromagnetic (HRAM) data-sets purpose examining their effects on geological structures characterize zones from area. To obtain necessary reduction geomagnetic variation, measurements regional gradients time variation were used. After applying magnetic equator (RTE) corrected data was obtained Nigerian Geological Survey Agency, NGSA, it possible determine expansions units for both qualitative quantitative interpretations. In addition, edge detection method used depict buried anomalies. Different handling processes applied data, such as local wavenumber (SPI), power spectrum analysis, Euler Werner deconvolution analysis. The RTE anomaly caused by anomalous delineated six sub-basins low amplitude response, which agrees total gradient (analytic signal) tilt angle derivative clearly outlined edges lithostratigraphic zones. sub-basin are southern Bida basin northern Anambra basin. source parameter imagings well major depth. Results showed area affected different lineament trending NE-SW, E-W, S-E trends. Directional indicates dominant trend fault orientations. estimated depth top lineaments average varies 0.3 km 4.6 relatively deeper basins compared surrounding areas giving clues amount sediment infill. A 2D forward model a sedimentary thickness ranging 1 7 km, consistent 3.5 proposed previous researchers.