FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Aeromagnetic, analytic signal, derivative, lineament, mineral vein, polynomial
In order to understand structurally, the patterns of subsurface geological features of a basement area due to their various rock properties, especially magnetite content, geophysics is always the answer. Such rock types include pegmatite, migmatite, biotite granite, porphyritic granite, biotite hornblende, etc. The first vertical derivative and analytic signal techniques have been applied to the aeromagnetic data of Ikara, to delineate the subsurface structures. The magnitude maxima of the vertical gradient of the residual magnetic intensity and the analytic signal for the contact locations of the lineaments were determined to be -28.7 and 21710.7 nT/m, respectively. These lineaments were found to be trending in the NE-SW and NW-SE directions, leaving a quite space (free of anomalies) in the central part of the study area. These lineaments in the basement could likely be associated to the Pan-African orogeny, since Nigeria as a country known to be lying within the vast pan-Africa (650±150𝑀𝑎) mobile belt. The results provide important information on geologic features of the area that has not been documented.
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