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Geophysical Delineation of Subsurface Fracture Associated with Okposi-Uburu Salt Lake Southeastern, Nigeria

Author Affiliations

  • 1Department of Geological Sciences, Nnamdi Azikiwe University Awka, NIGERIA
  • 2Physics Department University of Calabar, NIGERIA

Int. Res. J. Environment Sci., Volume 4, Issue (2), Pages 1-6, February,22 (2015)


10 vertical electrical sounding (VES) and 2 electrical resistivity tomography (ERT) were conducted around the vicinity of Okposi and Uburu salt lakes to delineate the depth of salty groundwater and the fracture zone that serve as conduit through which the salt lakes are recharged. 4 to 5 geoelectric layers were delineated from the computer interpreted VES data. The resistivity of the first to the fifth layer range from 82.3 to 397.3 m, 1.7 to 97.9 m, 17.3 to 244.1 m, 5.9 to 71.9 m, 42.7 to 95.8 m and were interpreted as shalely sand, fractured shale, shalestone, fracture shale, shalestone respectively. The thickness of the first layer is approximately 3m while the second layer ranges from 5 m to 25 m. An anomalous low resistivity region was observed from the ERT image at a depth of 5 m confirming the VES results. The low resistivity unit interpreted as fractured shale is an indication of salt water reservoir. The fractured shale also forms significant conduits at the base of the lakes for recharge.


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