Radially Average Power Spectrum and Curie Isotherm from High Resolution Aeromagnetic Data, Over Upper Benue Trough, Northeastern Nigeria
DOI:
https://doi.org/10.38032/jea.2025.03.007Keywords:
Spectrum, Aeromagnetic, Total Magnetic IntensityAbstract
Data corresponding to high-resolution Aeromagnetic surveys obtained at the various positions across the upper Benue trough in northeastern Nigeria have been used to estimate Curie isotherm depth, and to create the radially averaged power spectrum. Processing and management of data were performed in Oasis Montaj TM software, which allowed obtaining the Total Magnetic Intensity (TMI) and the residual magnetic anomaly maps. These maps formed an approximation to estimating the depth to the Curie isotherm and analyzing the radially averaged power spectrum. The depth extent is shown on the power spectrum analysis as shallow magnetic sources are between 0.16 and 1.13 kilometers, and deeper sources between 0.2 an+d 4.04 kilometers. The deep source, which displays the maximum thickness of sediments in the area, is caused by a deep-seated basement, whereas the shallow source depth is most likely the result of near-surface or shallow intrusions. The Curie depth result, which varies from 16.55 to 23.05 kilometers, represents the average local Curie temperatures recorded throughout the study area. The regions of Biu, Dumne, Shani, Yola, and Mayo Belwa were found to have high curie depths, respectively. It is thought that active metasedimentary volcanic activity and crustal thinning beneath the sub-basin are the causes of the Curie isotherm's change across the trough. The variation of the Curie shows how important mantle plume activity is at the beginning of rifting in the upper Benue valley isotherm across the trough.
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