A horizontal component of ground magnetic intensity was recorded for part of Ilesa town in Osun State, Southwestern Nigeria using a high resolution proton precision geometric magnetometer. Fifteen traverses were established in E-W direction within the study area. The study focused on delineation of geological structures such as rock contacts; rock boundaries, fractures and faulted zones. The field data was qualitatively and quantitatively interpreted; the results generated were used for estimation of lateral and depth extent of the different rock types in the area. Further enhancement analysis on the Horizontal Magnetic Intensity (HMI) data such as Reduced to Pole (RTP), Vertical Derivative (VD) and Band Pass (BP) yielded information on the altitude of the basement rocks which allows its further classification. The anomaly observed are significant enough in the study area in mapping geological subsurface structures that serve as deposit centre for mineral resources.
Key words: Magnetic intensity, residual ground magnetic, geomagnetic sections, horizontal derivatives, Ilesa.
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