Interpretation of high resolution aeromagnetic data of Kaoje and its environ, western part of the Zuru Schist belt, Nigeria: implication for Fe–Mn occurrence
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Date
2020-06-30
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Heliyon
Abstract
This study presents an appraisal of mineralization potential and the geologic record of Kaoje and environs using
high-resolution aeromagnetic data. The data were analyzed using the fast Fourier transform technique for
reduction-to-equator (RTE), analytic signal (AS), total horizontal derivative (THDR), tilt derivative (TDR), spectral
analysis and Euler deconvolution at varying spectral indices. The reduced to equator residual magnetic intensity
range from -73.4 to 205.6 nT and are associated with contrasting lithology of the Sedimentary and Basement
Complex rocks. The anomalies and analytic signal amplitude unfold and update the extension of Zuru Schist to the
southern region of Kaoje, elongated banded gneiss within the schist body, pegmatite intrusion through the
migmatite and NNW-SSE trending schist hosted manganite and sandstone-hosted goethite. Estimated depth to
shallow and deeper magnetic sources ranged from 0 to 59 m and 225–415 m respectively, and the corresponding
Euler solutions revealed perfect clustering along notable geologic features and minerals. The iron mineralization
are revealed as sourced from the magmatic bodies that lie beneath the sedimentary rocks and a corresponding
sphere geologic model within northwest and southwest of Kaoje at a depth range of 0–225 m. The structural
trends suggested the tectonic events in the area and indicate an imprint of Zungeru-Anka transcurrent fault that
serves as a conduit for iron mineralizing fluid to Kaoje.