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Delineation of Fractured Zones in Crystalline Basement Rocks by Direct Current Electrical Resistivity Method in Oke-ila Area, Southwestern Nigeria


Affiliations
1 Department of Geology, Delta State University, Abraka
 

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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  • Abdullahi Idris-Nda (2005) Groundwater potential of part of Kushaka Schist belt of North-Central Nigeria. Water Resour. 16, 90-95.

  • Adelusi AO, Igbedi AO and Folarin SL (2000) The geologic mapping of basement structures and its groundwater potential in Ero Area, Ondo State, Southwestern Nigeria. Water Resour. 12, 1-6.

  • Ako BD (1996) Applied geophysics. The subsurface and treasures. An Inaugural lecture delivered at the Obafemi Awolowo University, Ile-Ife. Inaugural lecture series, 113, OAU Press Ltd, Ile- Ife. pp: 42.

  • Ako BD and Olorunfemi MO (1989) Geoelectric survey for groundwater in the Newer Basalts of Von. Plateau State. Nig. J. Mining & Geol. 25(1&2), 247-251.

  • Aweto KE (2011) Aquifer vulnerability assessemtn at Oke-Ila area, Southwestern Nigeria. Intl. J. Phys. Sci. 6(33), 7574-7583

  • Bala AE and Ike EC (2001) The aquifer of the crystalline basement rocks in Gusau are, North-Westerns Nigeria. J. Mining and Geol. 37(2), 177-184.

  • Barker RD (1989) Depth of investigation of collinear symmetrical four-electrode array. Geophysics. 54, 1031- 1037.

  • Bayode S (2000) Geophysical characterization of the Iwo migmatite gneiss/granite complex. Its significance to groundwater potential. Unpublished M. Tech Thesis, Federal University of Technology, Akure, Nigeria. pp: 213.

  • Koefoed O (1979) Geosounding principles, I. Resistivity sounding measurements. Elsevier Scientific Publishing Comp. Amsterdam, pp: 275.

  • Lenkey L, Hamori Z and Mihalffy P (2005) Investigating the hydrogeology of a water-supply area using direct – current vertial electrical sounding. Geophys. 70(4), 1-19.

  • McDowell PW (1979) Geophysical mapping of water fille3d fractured zone in rocks. Int. Assoc. Eng. Geol. Bull. 19, 258-264.

  • Olasehinde PI (1989) Elucidating fracture pattern of the Nigerian basement complex using electrical resistivity method. Zangew, Geowiss, Left. pp: 109-120.

  • Olasehinde PI and Raji WO (2007) Geophysical studies of fractures of basement rocks at University of Ilorin, Southwestern Nigeria: Application to groundwater exploration. Water Resour. 17, 3-10.

  • Olayinka AI (1996) Non-uniqueness in the interpretation of bedrock resistivity from sounding curves and its hydrogeological implication. Water Resour. 7(1&2), 49- 55.

  • Olayinka AI, Akpan EJ and Magbagbeola DA (1997) Geoelectric sounding for estimating aquifer potential in the crystalling basement farea around shaki, Southwestern Nigeria. Water Resour. 8(1&2), 71-81.

  • Orellana E and Mooney HM (1966) Master tables and cruves for vertical electrical sounding over layered structures. Intersciencia, Madrid. pp: 34.

  • Rahaman MA (1989) Review of the basement geology of Southwestern Nigeria. In: the geology of Nigeria (eds Kogbe CA) 2nd edition, Rock View, Nigeria Ltd. pp: 538.

  • Rahaman MA (1976) Review of the basement geology of southwestern Nigeria. In: Geol. Nigeria. Elizabethan Publi. Co., Nigeria. pp: 41-58.

  • Rahaman MA and Ocan O (1978) On relationships in the Precambrain migmatite gneiss in Nigeria. J. Mining and Geol. 15, 23-33.

  • Vander Velpen BPA (2004) Resist version 1.0. M.Sc. Research project ITC, Daft, Netherland.

  • WHO(World Health Organization) (1996). Guidelines for drinking water, Vol. 1, Recommendation, Geneva, Switzerland.

  • Wright EP (1992) The hydrogeology of crystalline basement aquifer in Africa. In: The hydrogeology of crystalline basement aquifers in Africa (eds, Wright EC and Burges WG). Geol. Soc. Special Publ. 66, 1-27.

  • Zohdy AAR, Eaton GP and Mabey DR (1974) Application of surface geophysics to groundwater investigations. Techniq. Water Resources Investigations of Us Geol. Sur. Washington. pp: 66.


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  • Delineation of Fractured Zones in Crystalline Basement Rocks by Direct Current Electrical Resistivity Method in Oke-ila Area, Southwestern Nigeria

Abstract Views: 511  |  PDF Views: 132

Authors

K. E. Aweto
Department of Geology, Delta State University, Abraka

Abstract


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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DOI: https://doi.org/10.17485/ijst%2F2012%2Fv5i7%2F30497