JM Sawuta*, AU Sadiq, EE Udensi, AA Adetona, CI Unuevho, AA El-Mansur, MA Nyabam, OS Ayanninuola
Aeromagnetic data was analysed and used to delineate the structural features. These structural features include; lineaments, faults and folds which are channels for the accumulation of solid minerals were delineated with a trend of NE, NW, and SW direction. In delineating these structural features, some enhancement techniques such as first and second vertical derivative filters, Tilt derivative filter, analytical signal and CET were employed to enhance the structural features. The Residual Magnetic Intensity (RMI) map showed regions of different magnetic concentration which correspond to different lithology and depth of source rock with magnetic values range from -93.5 nT to 95.4 nT. The high magnetic signature occupied mostly the north-eastern and south- western part, corresponding to Akwanga, N/Eggon Keffi, Garaku and others. The extreme south-eastern part of the map which is the sedimentary region has low magnetic intensity. The residual and derivatives filters showed that most part of the area is characterized by a mixture of low and high magnetic closure of short wavelength that are high in frequency of occurrence. Few areas with relative sedimentation are denoted with averagely long wavelength. The analysis of the vertical derivatives maps and CET revealed fault zones, lineaments, and intrusions. These lineaments trend in the NW-SW direction while the fault lines trend mostly in the NE-SW and E-W directions. The analytical signal showed amplitude range of -0.01-0.110 nT/m. Most of the lineaments, faults and intrusions observed in the map have high analytical signal. Low analytical signal was observed on the sedimentary region. Generally, the structures observed from the magnetics maps agree with the geology map of the study area.
Published Date: 2025-01-17; Received Date: 2023-07-27
