Enhancement and modelling of aeromagnetic data of some inland basins, southeastern Nigeria

Ekwok, Stephen E.; Akpan, Anthony E.; Ebong, Ebong D.

doi:10.1016/j.jafrearsci.2019.02.030

Cited by 40 publications

(23 citation statements)

References 40 publications

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“…Generally, interpretations involving qualitative and quantitative procedures of potential field data can provide valuable information in mineral explorations, hydrocarbon surveys, archaeological and engineering studies, and can offer constraints in seismic interpretation. Areas predominated by complex geologic structures are ordinarily connected with short wavelength anomalies and mineralization (Ekwok et al, 2019;Arinze et al, 2019). High frequency filtering involving first vertical derivative (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…6a) and correspond with the direction of the Nigerian Benue Trough. These geologic features are caused by the tectonism that activated the intrusions of unmetamorphosed dolerites, granites and quartzo-feldspathic veins (Agbi and Ekwueme, 2018;Woakes et al, 1987) and Quaternary-Recent basaltic intrusions (Ekwok et al, 2019;Akpan et al, 2014) into the Precambrian basement and Cretaceous sediments of the OP and IMR respectively. In addition, Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Over time, geologic structures in the Precambrian basement rocks were caused by the intrusions of Mesozoic calc alkaline ring complexes that is, younger granites (Woakes et al, 1987). Similarly, the Cretaceous Lower Benue Trough (LBT) was vastly invaded by basic and intermediate intrusives of the Santonian Abakaliki Anticlinorium and Quaternary-Recent Cameroon Volcanic Line (Ekwok et al, 2019;Benkhelil, 1987). These happenings resulted to the development of various geologic structures, chemical processes and hydrothermal variations of the host rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Delineating geologic structures in conjunction with hydrothermally altered rocks are required for mineral prospecting purposes (Eldosouky et al, 2017). Currently, airborne magnetic and gravity data are considered as key constituents of mineral research programs (Ekwok et al, 2019;USGS 2013, Telford et al, 1990. The mapping of disparities in rock magnetizations and densities are made possible by these data.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic technique is an effective exploration tool anywhere magnetization is comparatively strong and there are somewhat disparities among the various rock units (Eldosouky and Elkhateeb, 2018). Features such as rock boundaries, surficial regional geologic borders, faults, fractures and dykes can be mapped on enhanced gridded data (Ekwok et al, 2019;Elkhateeb and Eldosouky, 2016). Also, the gravity prospecting is commonly used as a reconnaissance tool in hydrocarbon survey (Kearey et al, 2002, Telford et al, 1990, and constraints in seismic interpretations (Telford et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Implications of tectonic anomalies from potential field data in some parts of Southeast Nigeria

et al. 2021

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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.

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Section: Resultsmentioning

confidence: 99%