Abstract
In this study, ground magnetic survey of Sumaje Village, Ogo Oluwa area of Oyo State, Nigeria using high resolution proton-precession geometric magnetometer model G-856AX measures total components of the ground magnetic. The field data was qualitatively and quantitatively interpreted. Profile 1 has the highest amplitude of 18.2 nT and profile 2 has the highest width of 32 m. The depth to the basement rocks ranges between 6.25 to 13.75 m. The highly mineralized region of the study area is between traverse 1 to 5. Magnetic anomaly obtained varied between a minimum negative peak value of about -14.3 nT and a maximum positive value of about +3.8 nT. The maximum depth to basement rock is about 13.75 m. Ground magnetic contour map, 3-D map, and vector map showed that magnetic anomalies are as a result of rocks present in the region. The major rocks and minerals suspected to be found in this studied area and its environs are slate, gneiss, serpentenite, rhyolite, pegmatite, gabbro, basalts, oceanic basalts and hematite. Key words: Magnetic field, magnetic anomaly, magnetometer and Sumaje village.
Highlights
Ground magnetic survey has not been given much attention in the past; especially in developing country likeNigeria
The ground magnetic study of the studied area has helped in many ways to delineate the geological structures
The profiles obtained from the data helped in determining the depth to the magnetic basement of the studied area
Summary
Ground magnetic survey has not been given much attention in the past; especially in developing country likeNigeria. The use of ground magnetic survey method to delineate the subsurface structure is important. Magnetic survey sets out to investigate subsurface geology on the basis of anomalies causing magnetic field to result from magnetic properties of the underlying rocks (Philip et al, 2002). It is used in mapping geological boundaries between magnetically contrasting lithologies including faults (Telford et al, 2001). Most soils and much man - made objects that contain nickel or iron have magnetic properties detectable by a sensitive magnetometer because they create local or regional anomalies in the earth’s main field. Anomalies are revealed by systematic measurement of the variation in magnetic field strength with position. Folami and Ojo (1991) are of opinion that magnetic methods are sensitive to the susceptibility within the subsurface geology and so are ideal for exploring in the basement complex regions which make this method suitable for this research work
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