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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Delineation of Laterite Deposits using Two-Dimensional Geo-Electric Imaging in Agbonmwoba Village Area of Obaretin Town, Edo State, Nigeria.
by Osisanya Olajuwon Wasiu, Ibitoye Abel Taiwo, Eze Stanley, Ezomo F.O and Okeh Orji

The study involves delineation of laterite deposits in Agbonmwoba village area of Obaretin town, Edo state using 2D resistivity tomography technique to predict the extent and the economic viability of the deposit, in order to improve wellbeing status. The Petrozenith earth resistivity meter was employed using the Wenner-Schlumberger electrode configuration. Five different locations were investigated within the study area, and a total of ten (10) Wenner-Schlumberger soundings were acquired in the area with a spread length of 200m along each traverse. The field data was inverted using the Zondres 2D software. Four (4) lithologic units were delineated namely; clay deposit with resistivity range of about 1 100?m, sand deposit with resistivity range of about 200-570?m, laterite deposits with resistivity distribution overlapping from about 1000-3162?m and gravel deposit whose resistivity distribution ranging from about 8000-10,000?m. Laterite deposit were found along traverses 1, 2 and 8 sampled at old sapele road Ekiosa at depths of 13-15m in TR 1, 10-15m in TR2, and 5m in TR8 at horizontal spread of 40-90m, 10-20m, and 20-170m respectively. Laterite deposit were found along traverses 3 and 4 sampled at presco road Obaretin at depths of 10-15m in TR3, and 10-15m in TR4 at horizontal spread of 140-160m, and 160-180m respectively and also laterite deposit were found along traverses 5, 6 and 7 sampled at Agbonmwoba primary school at depths of 5-15m in TR5, 5m in TR6, and 15-25m in TR7 at horizontal spread of 40-50m, 50-70m, and 110-120m respectively. Traverse 9 showed no evidence of laterite deposit from its resistivity pseudo-section. The result shows that laterite deposits along traverses 1, 2, 3, 4, 5, 7, and 10 are located almost at the same depth within the subsurface which implies that the subsurface geology distribution along these traverses are homogenous, and the laterite deposits along these profiles is commercially viable for exploitation, while the laterite deposits delineated along traverses 6, and 8 in the study area are not homogeneously distributed with those delineated along other traverse at the depth imaged and as such is not commercially viable. The results were further compared with borehole lithologic section drilled along TR5 in the area and both sections agreed. Thus 2D resistivity imaging gives a better lateral view of the subsurface layers than geo-electric section computed from 1D models because of its ability to give a continuous record of subsurface formations at greater depth.
Keywords: electrical resistivity tomography (ert), geometrical effect, wenner-schlumberger configuration,
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



Copyright © Journal of Emerging Trends in Engineering and Applied Sciences 2010