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Asian Journal of Earth Sciences
  Year: 2012 | Volume: 5 | Issue: 3 | Page No.: 79-87
DOI: 10.3923/ajes.2012.79.87
 
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Geophysical Characterization of Basement Rocks and Groundwater Potentials Using Electrical Sounding Data from Odeda Quarry Site, South-western, Nigeria

B.S. Badmus and O.B. Olatinsu

Abstract:
This study was carried to characterize the basement rocks and groundwater potentials by delineating the resistivity and overburden thickness of subsurface lithology of Odeda quarry, south-western, Nigeria. Vertical electrical soundings were carried out at fifteen locations using Schlumberger electrode arrangement. The maximum current electrode spread and potential electrode separation were 200 and 5 m, respectively. Data acquired were interpreted using the manual partial curve matching method and a fast computer iteration technique to generate the geoelectric layer of various resistivity values and thicknesses. The geoelectric sections revealed the lithological sequence as: topsoil, weathered layer and fresh bedrock. The overburden coefficient of anisotropy also revealed that, the underlying basement rock is suspected be granite gneiss/granite-schist. The overburden coefficient of anisotropy was calculated for each sounding location and this ranges from 1.00 to 2.30. This was used in delineating the study area into region underlain by granite gneiss (λ between 1.00 and 1.03) and those regions with granite-schist (λ between 1.30 and 2.30) as the underlying basement rocks. At locations where current terminated at the fresh bedrock region, the thicknesses were undetermined. Groundwater potential is presumed to be very low within the study area as outcrops of gneissic rocks dominate the area. Locations where the regolith is of appreciable thickness, the resistivity of the layer suggests a material medium likely composed of clay/sandy clay or clayey sand which are not good aquiferous media from which groundwater could be extracted.
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How to cite this article:

B.S. Badmus and O.B. Olatinsu, 2012. Geophysical Characterization of Basement Rocks and Groundwater Potentials Using Electrical Sounding Data from Odeda Quarry Site, South-western, Nigeria. Asian Journal of Earth Sciences, 5: 79-87.

DOI: 10.3923/ajes.2012.79.87

URL: https://scialert.net/abstract/?doi=ajes.2012.79.87

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