Browsing by Author "Adepoju, S.A."

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    Combined Petrographic and Geochemical Studies of Maastrichtian Patti Formation Sandstone, Bida Basin, Nigeria: Implications for Provenance and Compositional Maturity
    (Faculty of Physical Sciences, University of Ilorin, 2015) Ojo, O.J.; Adepoju, S.A.; Adedoyin, A.D.
    Geochemical data on sandstone facies of the Maastrichtian Patti Formation in Bida Basin, Nigeria, is presented and interpreted in this paper with respect to its provenance and compositional maturity. Petrographic data from thin sections and X-Ray Diffractometry were also integrated. Petrographic data from the sandstones classified them mainly as quartz-arenites and minor sub-arkose while geochemical indices such as high average values of SiO2/Al2O3, low Na2O+K2O and K2O/Na2O values also indicate the samples are sub-litharenite to quartz-arenite type. Relatively high average values of total REE (141.40 ppm), Th (7.59 ppm), Hf (6.82 ppm), and Zr (205.12 ppm) coupled with low concentrations of Ni (3.06 ppm), Co (1.66 ppm) and V (20.65 ppm) in the sandstones indicate felsic igneous provenance. The discrimination functions plot shows that the sandstones were sourced mainly from matured sedimentary provenance and a passive margin setting is deducted based on the plots of TiO2 versus Fe2O3+MgO and K2O/Na2O versus SiO2. The sandstones show high average value of SiO2 (86.8 %) and low values of Al2O3 (6.11 %), K2O (0.12) and Na2O (0.02 %), suggesting that the sediments are mature. Plot of SiO2 versus (Al2O3+K2O+Na2O) further lend credence to chemical maturity and reveals semi-humid to humid paleoclimate. The Chemical Index of Alteration (CIA) value of 96.49 and the Plagioclase Index of Alteration (PIA) of 99.05 respectively are supportive of high weathering of the source area. The sands were most probably recycled from older Lokoja Formation during the late Maastrichtian Tethys inundation in the basin. Keywords: Agbaja, humid, maturity, Patti, plagioclase, provenance 1. Introduction
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    Geochemical and Mineralogical Investigation of Iron Mineralization in Ardogu and its Environment, Central Nigeria: Implications for Origin and Resource Potential
    (Journal of the Geological Society of Sri Lanka, 2023) Bamigboye, O.S.; Adepoju, S.A.; Omorinoye, O.A.; Bamidele, T.E.; Adefila, I
    Geochemical and mineralogical studies of iron ores in Ardogu and its environments, in central Nigeria were done to characterize it for iron mineralization and resource potential. Thirty core ironstone samples were selected from ten drilled boreholes for geochemical and mineralogical analyses. Geochemical results of selected samples reveal higher concentrations of Fe2O3 with low contents of SiO2, Al2O3, P2O5, CaO and MnO. The geochemical based ternary plot classified the iron ores as ironstone. A petrographical investigation of 10 selected samples reveals the composition of oolites and pisolites with the presence of few quartz grains within the iron rich mineral grains. Qualitative and quantitative mineralogical study using x-ray diffraction shows mineral assemblages including; iron oxides, silicates and carbonates. Mineralogical compositions and textural characteristics of the ironstones suggest genesis related to syngenetic and diagenetic processes. The paleoenvironment during deposition of the Fe-rich sediments is suggested to be an anoxic, organic rich and reducing condition during early diagenesis but with the development of the oolitic and pisolitic textures, there were prevalent oxidizing and dehydrating conditions. The similarity between the chemical data of the studied ironstones with some published data within Bida Basin shows economically viable market values.
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    A mini rice processing machine for Nigerian farmers
    (Association of Agricultural Technology in Southeast Asia (AATSEA), 2012) Adegun, I.K; Adepoju, S.A.; Aweda, J.A.
    The rice milling plant is developed to solve the problem associated with the manual processing of locally produced rice (OFADA RICE), particularly the removal of pebbles and other impurities from the rice. The machine consists majorly of two stages: dehulling and sieving. The dehuller consists of rotary cylindrical sieve which separates the chaff from the rice grains via the shaft and blade. Impact method was adopted for the removal of husk from the rice paddy. After milling the paddy rice, it passes through a vibrating sieve machine where a crank mechanism converts rotary motion into a reciprocating movement of the sieve bed. The vibrating sieve removes the chaffs and the pebbles from the rice grains. The performance tests conducted on the machine showed that the dehuller effectiveness reduced with increase in number of paddy rice fed into it, while the sieve shaker optimum yield occurs at a maximum stroke of 40. It was discovered that a minimum output shaft speed of 900 rpm transmitted by a v-belt drove by an electric motor of 3.5 hp which is required for the effective performance of the vibrating sieve. Mild steel was used majorly for the fabrication of component parts for ease of machining, assembling, maintenance and affordability. The plant would reduce the hazardous health implication currently experienced when eating locally produced rice. It would reduce the cost of labour and also enhance the economic status of the peasant farmers in Nigeria.