Abstract
This investigation is aimed at determining depth to the bottom of magnetic source and to reveal some certain geological features across Sokoto basin using source parameter imaging and 3D Euler deconvolution techniques. The investigation employed fifteen number aeromagnetic sheets covering longitude 4°30'E - 6°00E and latitude 11°00'N - 13°30'N. The total magnetic intensity of the area was subjected to reduction to magnetic equator using a geomagnetic inclination angle of 1.4°, declination of 1.7° and a standard deviation of 0.1. Similarly, the total magnetic intensity was also subjected to regional - residual separation using polynomial fitting of the second order, of the least square method. Consequently, the total magnetic intensity and the reduction to equator revealed intensities ranging from -67.16 to 118.27 nT and -58.33 to 119.21 nT/m, respectively. Similarly, the results from 3D Euler deconvolution revealed depths of 1.38, 2.14, 2.58 and 2.80 km for structural indexes of 0, 1, 2 and 3, respectively. Finally, the source parameter imaging result revealed a maximum depth of 1.65 km and a minimum of 0.1 km in the study area. The implication of these results is that, even if other conditions are met, the possibility of hydrocarbon exploration in the basin may be very marginal. Key words: Aeromagnetic data, reduction to equation, Euler deconvolution, source parameter imaging, Sokoto basin.
Highlights
Sequel to the release of the of high resolution aeromagnetic data by the Nigerian Geological Survey Agency acquired between 2005 and 2010 with 500 m line spacing and 80 m terrain clearance for most parts of Nigeria, the need to re-subject the data across Sokoto basin to a more geophysical investigation becomes inevitable
The enhancements/derivatives were generated in Oasis Montaj using the MAGMAP GX, while source parameter imaging (SPI) and Euler deconvolution are essentially depth-estimation and were estimated using SPI GX and Euler GX respectively
The low magnetic anomalies which are associated with the sedimentary region are found within the Southeastern (Gwashi, Wasagu and Zuru areas), Northcentral (Dange and Gummi) and in the northwestern of the study area
Summary
Sequel to the release of the of high resolution aeromagnetic data by the Nigerian Geological Survey Agency acquired between 2005 and 2010 with 500 m line spacing and 80 m terrain clearance for most parts of Nigeria, the need to re-subject the data across Sokoto basin to a more geophysical investigation becomes inevitable. Measurements involving the use of magnetic survey are used in estimating the geomagnetic field at any point on the earth’s surface. The method is a nondestructive method and measures the susceptibility contrast of subsurface rocks. By delineating subsurface structures due to the difference in susceptibility, geological inferences/interpretations which include delineation of faults, fonds, lithology, and depth can be made. Determination of depth to causative magnetic sources or the sedimentary thickness is primarily a topic of research by geoscientists within the study area and environs.
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