Applied Geophysics
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Applied Geophysics
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Item Determination of Depth to Buried Magnetic Rocks under the Lower Sokoto Basin, Nigeria Using Aeromagnetic Data. Nigerian Journal of Physics N.J.P. Vol 19 No.2 Pp 275 - 283.(Nigerian Journal of Physics N.J.P., 2007-08) ADETONA, Adebayo Abbass, Udensi E.E. and A.G Agelaga (2007).The Total Aeromagnetic Data covering the study area was subjected to First Vertical Derivative, Spectral Depth Amalysis and Source Parameter Imaging. The result from the First Vertical Derivative shows the Northern part of the area is covered by the young biotite granite of precambrian origin, and the western edge is covered by the old granite, gneisses and migmatite of Western Nigeria, while the remaining area are covered by the cretaceous sedimentary deposits. The entire area was divided into forty eight sections Spectral Depth Analysis was run for each of these forty eight sections, the result shows that a maximum depth above 7 km was obtained within the cretaceous sediments of Idah, and Ankpa, and bellow Udegi at the middle of the study area. Minimum depth estimate between 188.0 to 452 meters were observe around the basement regions. Result from Source Parameter Imaging shows a minimum depth of 76.983 meters and a maximum thickness of sedimentation of 9.847 km, which also occur within Idah, Ankpa and Udegi axis. The disparity observes in depth obtained by each method is discussed base on the merit and demerit of each method, and the depth obtained were compared with result from previous researchers. Geophysical implication of the result to oil and gas exploration in the area is briefly discussed.