Qualitative Interpretation of Airborne Gravity Data of Gboko and Environs: Implication of Mineral Exploration

Abstract

Enhancement techniques applied to the Bouguer anomaly map produced derivative maps for qualitatively interpretation. These techniques include analytical signal, tilt derivative, vertical and horizontal derivatives and shaded-relief imaging. The first vertical derivative enhanced the shallow sources, suppressed the deeper ones, and gave a better resolution of closely spaced sources. The horizontal accentuated derivative shallow masses and boundaries associated with lateral density variations. Boundaries, edges and anomaly contacts were also revealed. The analytical signal filter revealed the source contact and the highest amplitude of the analytical signal is recorded at the areas that have witnessed by intrusions. Upward continuation have determined the form of regional gravity variation over Gboko area which is related to the rifting within the Benue trough. These Geological structures serve as conduit for mineral formation.