Abstract
Ground magnetic survey of eastern part of Ilesa town in Osun State, Southwest Nigeria was performed. Total field magnetic data was recorded using high resolution proton precision geometric magnetometer which implores total components of the ground magnetic anomaly data running through fifteen traverses. This research focused on delineation of faults in this part of the highly mineralized Ilesa schist belt. The field data was qualitatively and quantitatively interpreted and the results gave values for the total component measurements of ground magnetic anomaly that varied between a minimum negative peak value of about -330 gammas and a maximum positive peak value of about 80 gammas. Depth to the basement rock was estimated using Peters half slope method which gave a maximum depth to basement of about 160 m. Information on wide range of magnetic intensities over the different rock types in this area were obtained from the interpretations. The results generated were used to delineate rock boundaries, major and minor faults in this area. Key words: Magnetic intensities, residual ground magnetic, geomagnetic sections, Ilesa east.
Highlights
The study area is located within tropical climate marked by the alternating wet and dry seasons
In order to prepare the data for interpretation, the Total Magnetic Intensity (TMI) was further enhanced using filtering techniques such as Reduced to Pole (RTP), Vertical Derivative (VD) and Band Pass (BP), Parasnis (1978)
The ground magnetic study of this area has helped in many ways to delineate lineaments and target zones which are of great benefits to the solid minerals sector of Nigeria economy
Summary
The study area is located within tropical climate marked by the alternating wet and dry seasons. Temperature is moderately high during the day and varies from season to season. Due to the passage of the sun on its way to and from the tropic of cancer, this resulted to two periods of high temperatures as recorded annually. The first period occur in March - April and the second period in November - December. The average daily temperature varies between about 20°C (for a very cold day) and about 35°C (for a very hot day). The coolest period is in the middle of the raining season (July - August) (Kayode, 2006)
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