Browsing by Author "Olatunji, S"

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    GEOPHYSICAL ASSESSMENT OF GROUNDWATER CONTAMINATIONS FROM LEACHATE INTRUSION IN AMOYO DUMPSITE
    (university of eloued -جامعة الوادي, 2022-01-01) Olatunji, S; Fauzan, A. O
    The work aims to map the extent of leachate intrusion in near-surface rocks around a reclaimed dumpsite (40 years old) in Amoyo town. Sixteen very low-frequency electromagnetic (VLF - EM) profiles were distributed in the four cardinal directions around the site. Twenty-nine (29) points were sounded, using Schlumberger approach, at all identified VLF anomalous points. The analyzed VLF-EM data revealed the presence of conductive pollutants (leachate plumes) at the subsurface. The geo-electric sections generated from the processed VES data supported the VLF-EM results. It is concluded that (i) leachate is still present in the rock formation of the reclaimed dumpsite several years after the abandonment and excavation of the waste materials (ii) the shallow aquifer is at risk of contamination (iii) the low resistivity of the basement rocks signified presence of leachates.
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    INTEGRATION OF REMOTE SENSING AND GEOPHYSICAL METHODS FOR STRUCTURAL AND LITHOLOGICAL MAPPING IN A PART OF PRECAMBRIAN BASEMENT ROCKS, NORTHERN NIGERIA
    (university of eloued -جامعة الوادي, 2022-01-01) Olatunji, S
    Landsat 8 OLIdata, Aeromagnetic data,and Radial Vertical Electrical Sounding (RVES) survey data were integrated to map lithology, delineate structures and their trends, and delineate possible mineralized zones in the area. Landsat 8 OLI data yielded a colorcomposite image, and surface lineaments map of the area. The aeromagnetic maps were utilized to map lithology, and subsurface structures. A radial survey confirmed the fractures derived from the structural maps. Results classified the area into three geological units viz: migmatite, banded gneiss, and quartzite. The banded gneiss is the most deformed and contains series of structures that are significant for mineral and groundwater explorations. Clay alteration is the most dominant in the area, followed by iron oxide alterations. Lineament alignments are N-S, NNW-SSE, NNE-SSW, NE-SW,and E-W directions