Browsing by Author "Nghargbu, K."

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    LITTIO-STRATIGRAPHY AND PETROLEUM SOURCE ROCK POTENTIAL OF THE SOUTHERN BIDA BASIN, NIGERIA
    (Department of Geology and Minning, Nasarawa State University Keffi, 2015-11-01) Usman, Halima Osu; Obaje, N.G.; Nghargbu, K.
    The study area is the Southern Bida Basin (Lokoja Sub-basin), extending from Gada-Biyu in the Federal Capital Territory to the Agbaja Plateau in Kogi State of Nigeria. This area is geologically underlain by three rock units namely: the Lokoja, Patti and Agbaja Formations. The Lokoja formation composes of tine to medium coarse grained sandstone, poorly sorted associated with sedimentary structural features ranging from parallel lamination to cross bedding (herring bone structures) indicating continental environment of deposition with marine tidal influxes. Suspension settling in a low energy setting was attributed to the deposition of the Patti Formation with a lithologic composition of shales and siltstones which are rhythmically interbedded with concrctional to massive bioturbated ironstones. The Agbaja Formation composes of oolitic ironstones beds. The micropaleontological studies of the rocks in this area show that (he foraminiferal assemblages in Patti Formation are lowly diversified and dominated by four (4) genera, namely: Animbaculites, Milliammina, Trochamina and Textularia. This agglutinated benthonic foraminiferal assemblage indicates deposition of the Patti Formation in an anoxic shallow marine environment.
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    NITRATE CONCENTRATION AND GROUNDWATER VENERABILITY IN TYPICAL SHALLOW BASEMENT AQUIFERS AROUND KEFFI AREA, NORTH-CENTRAL NIGERIA
    (Department of Geology and Minning, Nasarawa State University Keffi, 2011-11-06) Obrike, Stephen E.; Anudu, G.K.; Iyakwari, Shekwoyandu; Nghargbu, K.; Osadebe, C.C.
    Keffi 414 environs is characterized لا near surface outcrops o f underlying basement rocks and s h a lli overburden thickness.The study assessed tire potential ofnitrate-nitrogen (NOj-N) contamination o f surface and groundwater within the study area. Thirty-two groundwater samples and four stream samples were collected from different locations across the study area and analysed for their NO٢N concentration. Groundwater sampling were restricted to well-covered shallow hand-dug wells SHW}, medium depth hand pumps (MHP) and motorised boreholes (DMBH). In all the groundwater samplesanalysed,12.5°/oofthemexhibitedN03-Ncontentshigherthan O h g L 1 and 60% o f the samples collectedfrom the agricultural fields contained N o ٢N higher than 0 .05mgL؛ in contrast to 20% of samples from residential areas. Results also revealed an inverse relationship between the NOj-N concentrations and the depth o f the sampling aquifers (SHW>MHP>DMBH). All of the analysed samples contained NO3-N load 1656 than thefixed threshold limit by WHO (2006١ for drinkingpurposes of below lOmgi;1, thus, rendering the waters safe for drinking purposes.