Basinal Structure Of Yola Arm Of The Upper Benue Trough Nigeria; Evidence From Aeromagnetic Data

Obi, DA; Okereke, CS; Egeh, UE; Olagundoye, OO

doi:10.4314/gjgs.v6i2.18767

Cited by 2 publications

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“…The areas where the maximum sedimentary thickness was obtained from the modeling traversing along WSW-NNE also correlate with areas where the maximum depth was obtained from the spectral analysis at WSW and NNE parts. The depth results of the present study compares favorably with the depth results obtained by earlier researchers who have worked within the lower Benue trough (Obi et al, 2010;Ugwu & Ezema, 2012;Igwesi & Umego 2013;Abdulahi et al 2014;Obiora et al 2018;Osinowo & Taiwo 2020). The igneous intrusions of gabbro and diabase delineated from the current study closely agrees with the results of Ugwu and Ezema (2012) who also delineated igneous intrusions of granite, dolerite, basalt and rhyolite from their modeling results.…”

Section: Discussionsupporting

confidence: 90%

“…This was done on the basis of depths to basements/magnetic source bodies over the lower Benue trough and Anambra Basin in which the study area falls. Obi et al (2010) investigated the lower Benue trough in Nigeria and identified the presence of twelve (12) intrusive bodies with a sedimentary thickness of 1.0 to 4.0 km from the modeling power spectrum and horizontal gradient. They further opined that areas like Ikot Ekpene, Nkalagu, Uwet and Abakaliki are having enough sediments thickness of (greater than 2km) for hydrocarbon generation but the presence of many intrusives with large lateral extents is an indication of over mature source rocks which could make the areas less favorable for hydrocarbon exploration.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Geophysical Investigations Inferred from Airborne Potential Field Data of Parts of the Lower Benue Trough in Nigeria

E.K.,

G.N.,

E.O.

2023

African Journal of Environment and Natural Science Research

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The aeromagnetic data of Nkalagu and Abakaliki areas were interpreted using spectral analysis and modeling to estimate depth to the sedimentary thickness, nature of intrusive, susceptibility values and types of minerals associated with them. The total magnetic intensity was processed to produce the residual magnetic map which was divided into 21 overlapping blocks. Each block was subjected to a spectral program plot (SPP) developed with MATLAB to obtain depths to the top boundary Zt and depth to the centroid Z0. The spectral analysis revealed depths to the top boundary Zt, which is the depth to magnetic basement ranging from 0.77 to 2.34 km with an average value of 1.72 km and the centroid depth ranging between 2.22 and 5.93 km, with an average depth of 3.55 km. The modeling estimated depths of profile 1, 2, 3, and 4 at 5 km, 1 km, 1.68 km and 1.32 km respectively with an average depth of 2.3 km and respective susceptibility values of 0.002, 0.003, 0.003 and 0.003 respectively, indicating the presence of igneous intrusions of gabbro, diabase and metamorphosed sedimentary rocks of quartzite and schist, with iron rich minerals like pyrite, limonite, cassiterite and arsenopyrite. The maximum depth values of 2.34 km and 5 km obtained from the two depth estimation methods confirm feasibility depths for hydrocarbon accumulations. In view of the above results, it is evident that the presence of intrusions delineated from the modeling results accounts for the mineralization in the area and can also destroy any hydrocarbon present since the presence of numerous intrusions are an indication of exceedingly high temperature history.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%