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Asian Journal of Earth Sciences
  Year: 2012 | Volume: 5 | Issue: 3 | Page No.: 70-78
DOI: 10.3923/ajes.2012.70.78
 
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Estimation of Magnetic Basement Depths Beneath the Abeokuta Area, South West Nigeria from Aeromagnetic Data Using Power Spectrum

J.A. Olowofela, O.D. Akinyemi, O.A. Idowu, O.T. Olurin and S.A. Ganiyu

Abstract:
This study presents the result of spectral analysis of aeromagnetic data of Abeokuta area, a basement complex of South-western Nigeria. Aeromagnetic survey is a powerful tool in delineating the regional geology of buried basement terrain. The purpose of magnetic surveying is to investigate the subsurface based on the variation in the observed magnetic field result from the differences in the magnetic properties of the underlying rocks, or in some cases cultural sources. In order to achieve the aim of this study, matched pass filtering operation was performed on digitised aeromagnetic data of the area under consideration to separate magnetic anomalies produce by shallow features and cultural features separated from anomalies produced by deeper geologic unit. Two-dimensional spectral analysis revealed that the magnetic sources are mainly distributed at two levels. The shallow source is depth 0.467 km below ground level is inferred to be due to the intrusions within the region. The deeper sources depth, which is 2.797 km below ground, is attributed to the underlying basement. The mean shallow depth and deeper depth are 0.467 km and 2.797 km, respectively. The shallow depth of 0.467 km might probably due to intrusive within the sediment while deeper depth of 2.797 km is attributed to underlying basement. Variation in magnetic depth values reveals the general trends in the magnetic basement surface.
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How to cite this article:

J.A. Olowofela, O.D. Akinyemi, O.A. Idowu, O.T. Olurin and S.A. Ganiyu, 2012. Estimation of Magnetic Basement Depths Beneath the Abeokuta Area, South West Nigeria from Aeromagnetic Data Using Power Spectrum. Asian Journal of Earth Sciences, 5: 70-78.

DOI: 10.3923/ajes.2012.70.78

URL: https://scialert.net/abstract/?doi=ajes.2012.70.78

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