Research Article

Electrical Resistivity Imaging (ERI) of Slope Deposits and Structures in Some Parts of Eastern Dahomey Basin

P.R. Ikhane, K.O. Omosanya, A.A. Akinmosin and A.B. Odugbesan

Outcrop analog are important tools for better understanding of large scale seismic features such as slope deposits and structures. Sedimentary exposures at Ijebu Omu, Itele and Ijebu Ife, all within the eastern part of Dahomey basin, Southwest Nigeria were imaged using Electrical geophysical method with the aim of reconstructing the geological history of the area and providing a basis for understanding larger scale structures. The Electrical Resistivity Imaging was done using a Wenner array configuration with a -spacing of multiples of 5 m; the result was iterated using RES2DINV. Both smooth and robust inversion of the apparent resistivity data was carried out. From the geologic models, dimension of structures were determined and three dimensional evolutionary diagrams were drawn. Six (6) geo-electric facies were identified from the three locations; they include clay, resistive clay, sand, sandstone, compacted sandstone and conglomerate with average resistivity value of ~16.27 Ωm, ~58 Ωm, ~392 Ωm, ~1264 Ωm, ~2196 Ωm and ~4633 Ωm, respectively. The meandered sandy bodied channels identified at Ijebu Omu have aspect ratios of ~4.00, ~1.37, ~2.59 and ~3.13, respectively, those at Itele ~5.9 and ~7.30 and the one at Ijebu-Ife ~3.19; meanwhile ~5 m, ~8 m and ~8.5 m thick clastic dykes were seen at Itele. Due to their high aspect ratios, the sinuosity of the channels in the study area is very high, thus the conclusion that they are meandering. The clastic dykes at Itele were formed as a result of overburden pressure and undercompaction typical of soft sediment deformation or syn-sedimentary deformation.

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P.R. Ikhane, K.O. Omosanya, A.A. Akinmosin and A.B. Odugbesan, 2012. Electrical Resistivity Imaging (ERI) of Slope Deposits and Structures in Some Parts of Eastern Dahomey Basin. Journal of Applied Sciences, 12: 716-726.

DOI: 10.3923/jas.2012.716.726

URL: https://scialert.net/abstract/?doi=jas.2012.716.726

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Authors

P.R. Ikhane

K.O. Omosanya

A.A. Akinmosin

A.B. Odugbesan

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Research Article

Electrical Resistivity Imaging (ERI) of Slope Deposits and Structures in Some Parts of Eastern Dahomey Basin

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