Department of Geology and Mineral Science

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Browsing Department of Geology and Mineral Science by Author "Ajadi Jimoh, Adeyemi Sultan Faruq, Olasunkanmi K. Nurudeen, Babalola Olufemi"

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    An Appraisal of the Geologic Setting in the Basement Complex Terrain Around Malete, Southwestern Nigeria: Implications on Groundwater Occurrence
    (FUOYE Journal of Pure and Applied Sciences, 2018-12-03) Ajadi Jimoh, Adeyemi Sultan Faruq, Olasunkanmi K. Nurudeen, Babalola Olufemi
    In an attempt to update the geologic setting and investigate groundwater resources of Malete in Moro Local Government area of Kwara State, reconnaissance geological mapping and electrical resistivity geophysical field mapping were carried out. The lateral lithologic geometry and geologic features were established on the outcrops while the vertical extents were interpreted from resistivity sounding that involved Schlumberger electrode configuration. The lithologic units formally reported by Nigeria Geological Survey Agency as comprising migmatitic gneiss and porphyritic granite, were updated as including massive and foliated quartzites, porphyroblastic gneiss, biotite granite and other minor intrusives viz; pegmatites, aplites, and vein quartz. The granitic rocks discordantly intrude the migmatites and quartzites and mostly appear to have been caught up by tectonism at the waning stage of the Pan African orogeny as evident from the observed tectonic imprints not Nigerian older granite suites. Occurrences of intermittent pelitic bands observed to be alternating with large blocks of massive quartzitic layers suggest a sedimentary precursor for the quartzite bodies in the area. The resistivity variation ranged between 13.6 and 7740.4 Ωm and four-layer earth model which comprised sand lateritic topsoil, clayey sand, weathered basement and fresh/fractured basement were identified. The models revealed KH, HK, HA and AK types apparent resistivity curves with overburden thickness range between 0.2 and 9.6 m. The HK-type with geoelectric sequence of resistive–conductive–resistive–conductive, within quartzitic layer and thick overburden exhibit good aquifer characteristic and depict probable point for groundwater in the area.