ABSTRACT
Mapping of hydrothermal alteration zones associated with mineralization is of great importance in mineral exploration, especially in the early stages of exploration. In the present study, integrated airborne geophysical datasets (advanced spaceborne thermal emission and reflection radiometer (ASTER); radiometric, magnetic, and rock geochemical survey in mapping hydrothermal alteration zones associated with mineralization in Ojirami-Dagbala Province were utilized. Band rationing (BR) and false colour composite (FCC) techniques were applied to the ASTER data in mapping hydrothermal alteration halos (ferric oxides, ferrous oxides, phyllic, argillic, and propylitic) using the F-parameter and K-ideal mathematical expression combinations of potassium, thorium, and uranium to produce K/eTh and K/eU ratios of potassium-enrichment which varied from 2.076%/ppm - 4.291%/ppm and 0.170%/ppm - 0.484%/ppm respectively. Thereafter, Structural analysis was performed on the aeromagnetic data, using the first vertical derivative (FVD), horizontal gradient magnitude (HGM), tilt derivative (TD), analytical signal (AS), and center for exploration targeting (CET) filter techniques. The results of the structural analysis revealed three major trends: (ENE-WSW, NS, and WNW-ESE) representing three deformational (D-1, D-2, and D-3) phases, which have the imprints of the Liberian, Pan-Africa and Eburnean orogenic events respectively.
