• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2012, Volume: 5, Issue: 7, Pages: 1-4

Original Article

Delineation of fractured zones in crystalline basement rocks by direct current electrical resistivity method in Oke-Ila area, southwestern Nigeria


A dc-electrical resistivity investigation of Oke-Ila area was carried out with a view to delineating fractured zones within the crystalline basement rocks. The electrical resistivity survey involved vertical electrical soundings at twenty five locations using ABEM SAS 1000 terrameter. The results of the investigation revealed three distinct geoelectric layers: top soil, weathered layer and fractured/fresh crystalline basement rocks. Fractured zones with high aquifer potential were delineated as resistivity lows against the background resistivity highs of the fresh basement rocks. The study revealed that the fractured zones which constitute the productive water bearing zones are discontinuous (localized) and they occur at an average depth of 37.5m. Keywords: Aquifer, Fractured bedrock, Basement depression, Regolith, Superficial deposits


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