Abstract
3D Moho interface has been computed from the airborne Bouguer anomaly beneath the southern part of the Benue Trough (BT), using the MATLAB program 3DINVER.M. From the study, the maximum Moho depth of 27.5 km and the minimum Moho depth of 18.1 km were computed. Interpretation of the gravity data of the southern part of the BT suggests that igneous input contributed greatly to the understanding of its concomitant deep crustal processes. The Moho depth elevation from the area is calculated to be around 9.4 km. This is in agreement with the Moho uplift within the study region as suggested by earlier researchers. Key words: Lower Benue trough, crust, mantle, bouguer gravity data, 3DINVER.M.
Highlights
Gravity method is one of the oldest geophysical survey methods used by geophysicists
It was the first geophysical technique to be used in oil and gas exploration and despite being eclipsed by seismology, it has continued to be an important method in a number of exploration areas
F( g), is the Fourier transform of the gravitational field, G is the universal gravitational constant, is the wavenumber, is the mean horizontal depth to the interface and is the density contrast between the two interface, g is the gravity anomaly, h(x) is the depth to the interface and n is the number of iteration
Summary
Gravity method is one of the oldest geophysical survey methods used by geophysicists. It was the first geophysical technique to be used in oil and gas exploration and despite being eclipsed by seismology, it has continued to be an important method in a number of exploration areas. Radioactivity and some electrical techniques, gravity method is a natural- source method. Local variations in densities of rocks near the surface cause minute changes in the gravity field. Gravity method is often regarded as a potential field method. Gravity is an inherent property of mass and the gravity effects of local masses are very small compared with the effect of the background field of the earth as a whole
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