Assessment of the Reliability of Magnetic Method to Delineate Geologic Features in a Basement Complex: A Case Study of Phase 1, Federal University Oye

Abstract A geophysical survey using magnetic method was carried out to map the bedrock topography, delineate region of potential stress amplification and to map structures such as faults and contact zones in Oye Ekiti, Ekiti state, south western Nigeria. Nine traverses were laid in the east-west direction of the surveyed area for the investigation. The station separation was ten metres interval and records of total magnetic field were made from the proton precision magnetometer system. The data obtained were subjected to drift correction and filtered. Softwares such as Grapher, Magmap 2000, Magpick and Sulpher-8 were employed for the processing and data reduction. The magnetic data are presented in form of magnetic profiles and maps. Total magnetic field plot of the entire survey profile describes a noted trend that agrees with known geology or suspected feature areas of high/positive and low/negative magnetic anomalies. The map shows the areas of high magnetic gradient (closely packed contour lines) which coincide with the part of the surveyed area with outcrops and areas of low magnetic gradient (sparse distribution of contour lines) which is the area of the plain land with no physical features. The depth to the top of the bedrock ranges between 0 m and 6.6 m. From the result of the magnetic survey, it is obvious that there is assuring ability of the method to actually delineate interesting features in the basement complex terrain.

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Updated: July 22, 2016 — 12:24 pm
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