Estimation of Sedimentary Thickness of Maiduguri, Northeastern Nigeria, from Fourier Analysis of Aeromagnetic Data
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Date
2016
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Abstract
A quantitative interpretation of the aeromagnetic anomalies of Maiduguri (Sheet 90) in the north-eastern region of Nigeria has been carried out using Fourier transform method. The study arear covers approximately 3,025 square Kilometers and forms part of Chard Basin. Regional anomalies were removed from the total magnetic field using 2D least method and the resulting residual data were used to obtain Fourier Spectra of 20 selected profiles. Slopes of high and low frequency portions of each spectrum were utilized to estimate depths to shallow and deeper magnetic sources. The results show that the depths to shallow and deeper magnetic sources vary from 0.30 to 0.84 km with an average of 0.42 km and from 0.85 to 3.27 km with an average of 1.59 km respectively. Depths to deeper magnetic sources are normally inferred as sedimentary thickness; therefore the results indicate that the estimated thickness of sedimentary fill in Maiduguri area of Chad basin ranges between 0.85 and 3.27 km
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Keywords
Aeromagnetic, Spectral, Residual, Sedimentary, Maiduguri
Citation
Nwankwo, et al. (2016). Estimation of Sedimentary Thickness of Maiduguri, Northeastern Nigeria, from Fourier Analysis of Aeromagnetic Data.