Analytic Signal Method (Hilbert Solution) for the Investigation of Iron-Ore Deposit Using Aeromagnetic Data of Akunnu-Akoko Area, Southwest, Nigeria

摘要

Investigation of iron ore deposit cannot be overlooked because of its economic importance and demand by steel industries. Hence, this paper aimed at providing clear information about the existence of iron ore deposit in Akunnu-Akoko area. The Akunnu-Akoko area is located between latitude 7.5833oN and 7.7000oN and longitude 5.9167oE and 6.0000oE respectively. Aeromagnetic data sheet 245 was acquired from the Nigerian Geological Survey Agency (NGSA). The acquired data were processed and interpreted using an analytic signal method (Hilbert solution) in order to calculate susceptibilities of rocks in the area which further enhances the investigation of the speculated iron ore deposit in the study location.The minimum curvature method was applied to create an aeromagnetic image map, 3D image map, vector map and contour map for the area respectively. The magnetite type of iron ore was suspected in the area with a high susceptibility range 0.07 - 0.14. Maps obtained revealed magnetic high and low in the area. Magnetite gneiss, granite gneiss, periodolite, pure dolomite and iron ore mineralization was delineated which is in agreement with the geology of the area. The study location is characterized by high and low magnetic values with preponderance of iron-ore within latitude 7.7000o to 7.7050o and longitude 5o 551 to 5o 571 of the entire area.