Abstract
Tectonic structures controlling mineralization in some parts of Southeast Nigeria were evaluated using airborne potential field data. High- and low-frequency filters and depth determination tools were adopted to evaluate short- and long-wavelength anomalies, resolve the spatial spreading of igneous intrusions, depths to geologic sources and basin topography. The high-frequency results exhibited high concentration of short-wavelength anomalies in the Obudu Plateau and Ikom–Mamfe Rift. The underlying main tectonics of the area elucidated by the low-frequency results caused the widespread occurrences of short-wavelength geologic structures that are revealed by the high-frequency maps. The study area is characterized by comparatively thin (~ 13.0 to < 3000 m) sedimentation. The observed thin thickness is as a result of the massive Precambrian basement outcrops in some locations in the Obudu Plateau and the proliferation of igneous intrusions within this part of the Lower Benue Trough. The 2-D models showed the undulating nature of the underlying basin topography, the location of intrusions, domal structures and related normal faults. The locations and neighbourhood of intrusions and/or short-wavelength structures are viable sites for lead–zinc–barite, brine and metallogenic minerals.
Highlights
Introduction The evolution of the NigerianBasement Complexes and Benue Trough were considered in the light of tectonothermal and global tectonic events respectively (Agbi and Ekwueme, 2018; Burke and Dewey, 1974)
The enhanced use of geologic concepts and geophysical investigations in a completely integrated programs have been successful in the determination of buried geologic structures and location of new mineral deposits (Woakes et al, 1987)
The anticlinal anomaly that runs in the north-south direction related to the Abakaliki Anticlinorium (AA) in the Lower Benue Trough (LBT) was properly elucidated by the gravity map (Fig. 4b), and short wavelength locations at the western flank of the area matches very closely (Fig. 4)
Summary
Introduction The evolution of the NigerianBasement Complexes and Benue Trough were considered in the light of tectonothermal and global tectonic events respectively (Agbi and Ekwueme, 2018; Burke and Dewey, 1974). We used image analysis, potential field enhancement methods and 2-D modelling to map hydrothermally modified rock zones, identify probable geological site of mineralization and basin framework in the study area.
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