Browsing by Author "Jimoh Ajadi"

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    Geochemistry and Mineralogy of Maastrichtian Coals from the Anambra and Gongola Basins of Nigeria: Implications for Coal Quality, Resource Potential, and Agglomeration Characteristics
    (Journal of Economic Geology, 2024-06-22) Ayoola Yusuf Jimoh; Mariam Bolaji; Jimoh Ajadi; Shakirat Mustapha Aminu; Mutiu Adelodun Akinpelu
    Anambra and Gongola basins are part of the sedimentary inland basins in Nigeria characterized by fossil fuels and in response to its present energy problem, Nigeria has shifted its power generating focus to coal. The studied coals were obtained from two localities, namely Ankpa and Maiganga in Kogi and Gombe States, respectively. The coals were investigated to determine its quality in terms of use and resource potential. The coals were analyzed by proximate, ultimate, elemental, mineralogy and scanning electron microscopy-energy dispersive spectrometry analyses. The objectives of the study are to determine the coals cokability, rank, paleoenvironments, hydrocarbon potential, and slagging tendency. The average values of moisture content, ash, volatile matter, and fixed carbon are 5.54%, 16.42%, 48.45%, and 30.71%, respectively, for Ankpa coals, while Maiganga recorded 10.68%, 8.60%, 44.33%, and 36.41%, indicating high volatile subbituminous non-coking coals that are optimum for combustion and electric power generation. The Van Krevelen plot based on the H/C vs. O/C showed Type IV kerogen. The XRD results, correlation plots, and Detrital Authigenic Index (DAI) values of 7.49 and 13.49 in Ankpa and Maiganga coals, respectively, indicated that Ankpa coals are enriched in authigenic minerals like quartz, pyrite, and calcite, while kaolinite and quartz were probable detrital minerals in the Maiganga coals. The agglomeration of the coals deduced by Base/Acid (B/A), Silicon ratio (G), Silica/Alumina (S/A), Iron/Calcium (I/C), Carbon/Hydrogen (C/H), and Fixed Carbon/Volatile matter (FC/V) showed weak–medium-strong for the Ankpa coals and strong for Maiganga coals.
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    Geochemistry and Mineralogy of Maastrichtian Coals from the Anambra and Gongola Basins of Nigeria: Implications for Coal Quality, Resource Potential, and Agglomeration Characteristics
    (2024) Jimoh Yususf; Mariam Bolaji; Jimoh Ajadi; Shakirat Mustapha Aminu; Mutiu Adelodun Akinpelu
    Anambra and Gangula are part of inland sedimentary basins in Nigeria characterized by fossil fuels, and Nigeria has shifted the focus of its electricity generation to coal to solve its current energy problem. The studied charcoal was obtained from the two regions of Ankepa and Maiganga in the states of Kogi and Gombe, respectively. Charcoal was investigated to determine the quality, use, and potential of its resources. These charcoals have been decomposed using proximity, finite, elemental, mineralogy and electron microscopic analyses. The purpose of this study was to determine the coking capability, ranking, paleoanoic environments, hydrocarbon potential, and melting tendency of coals. The mean values of moisture, ash, volatile matter and fixed carbon content for Ankepa charcoal were 5.54, 16.43, 48.45 and 30.71 percent, respectively, and for Maiganga charcoal were 10.68, 8.60, and 44.33 percent, respectively. 36.41% which indicates subbituminous non-coking coals with high volatile content and are suitable for fuel and electricity generation. The Van Krulen diagram based on H/C vs. O/C showed that type IV kerogen is present. The results of XRD, correlation diagrams and values of pollutant and non-material index (DAI) of 7.49 and 13.46 for Ankepa and Maiganga charcoals showed that Ankepa charcoals were enriched with in-situ materials such as quartz, pyrite and calcite, while kaolinite and quartz are probable clastic materials in Maiganga charcoals. In summary, the accumulation of Ankepa charcoal based on acid/base ratio (B/A), silicon ratio (G), silica/alumina ratio (S/A), iron/calcium ratio (I/C), carbon/hydrogen ratio (C/H), and fixed carbon/evaporative matter ratio (FC/V) showed weak, medium and strong accumulation for Ankepa charcoal and strong accumulation for Meiganga charcoal, respectively.
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    Geochemistry and Mineralogy of Maastrichtian Coals from the Anambra and Gongola Basins of Nigeria: Implications for Coal Quality, Resource Potential, and Agglomeration Characteristics
    (Journal of Economic Geology, 2024-06-22) Ayoola Yusuf Jimoh; Mariam Bolaji; Jimoh Ajadi; Shakirat Mustapha Aminu; Mutiu Adelodun Akinpelu
    Anambra and Gongola basins are part of the sedimentary inland basins in Nigeria characterized by fossil fuels and in response to its present energy problem, Nigeria has shifted its power generating focus to coal. The studied coals were obtained from two localities, namely Ankpa and Maiganga in Kogi and Gombe States, respectively. The coals were investigated to determine its quality in terms of use and resource potential. The coals were analyzed by proximate, ultimate, elemental, mineralogy and scanning electron microscopy-energy dispersive spectrometry analyses. The objectives of the study are to determine the coals cokability, rank, paleoenvironments, hydrocarbon potential, and slagging tendency. The average values of moisture content, ash, volatile matter, and fixed carbon are 5.54%, 16.42%, 48.45%, and 30.71%, respectively, for Ankpa coals, while Maiganga recorded 10.68%, 8.60%, 44.33%, and 36.41%, indicating high volatile sub bituminous non-coking coals that are optimum for combustion and electric power generation. The Van Krevelen plot based on the H/C vs. O/C showed Type IV kerogen. The XRD results, correlation plots, and Detrital Authigenic Index (DAI) values of 7.49 and 13.49 in Ankpa and Maiganga coals, respectively, indicated that Ankpa coals are enriched in authigenic minerals like quartz, pyrite, and calcite, while kaolinite and quartz were probable detrital minerals in the Maiganga coals. The agglomeration of the coals deduced by Base/Acid (B/A), Silicon ratio (G), Silica/Alumina (S/A), Iron/Calcium (I/C), Carbon/Hydrogen (C/H), and Fixed Carbon/Volatile matter (FC/V) showed weak–medium-strong for the Ankpa coals and strong for Maiganga coals
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    Groundwater Potential Evaluation in Parts of Southwestern Nigeria Using Dar-Zarouk Parameters
    (LAUTECH Journal of Civil and Environmental Studies, 2022) Saminu Olatunji; Umar Issa; Jimoh Ajadi
    Dar-Zarouk parameters namely longitudinal conductance, transverse unit resistance, longitudinal resistivity, traverse resistivity, and coefficient of anisotropy, derived from electrical resistivity soundings, were employed in the western and south western portions of Sheet 223 Ilorin NW, Southwestern Nigeria to evaluate the subsurface water prospect. This is aimed at determining the potentiality and vulnerability of groundwater in the area. The longitudinal conductance values obtained range from 0.027 S at VES 3 in the north, indicating the poorest protective capacity, to 26440.95 S at VES 157 in the south, indicating the highest protectivity. Thus, the protective capacity rating of the study area shows very poorly, weak, moderate, good, and excellent ratings at VES stations 10, 12, 9, 2, and 178 respectively. The total transverse resistance range is 8.6 – 32733.87 Ωm2, with the lowest at VES 206 in the southeastern part, indicating high prospects, and the highest at VES 47 in the northern part of the area, indicating poor prospect. The lowest longitudinal resistivity (0.1951 Ωm), indicating high potential as well, occurs at the southern part and while the highest value of 8095.63 Ωm is obtained at the northern part.Furthermore, the coefficient of anisotropy in the area ranges between 0.029 and 5349.78. The south-western boreholes have values that fall between the standard range of 1.39-1.66, indicating that those areas have boreholes with high productivity. In conclusion, most parts of the study area have excellent protective capacities and high potentiality.
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    Mineralogy, Geochemistry and Economic Potentials of Pegmatites around Egbe-Ejiba-Isanlu, Isanlu Sheet 225 Southwestern, Nigeria
    (Journal of Mining and Geology, 2022) Jimoh Ajadi; Abdulrasaq Olawale Busari; Abdulwasiu Sunday Babatunde; Fatimah Bukola Toyin; Razak Onawole Jimoh; Shakirat Oluwarantimi Mustapha; Taofeeq Ayinde Issa
    This study focused on the geochemistry and economic potentials of the rare metal mineralization within the pegmatites of the Egbe-Ejiba-Isanlu areas using geological, geophysical, and geochemical techniques. From a total of 92 fresh rock samples collected, 40 were cut into thin sections for petrographic studies, 20 cut and polished for ore microscopic studies while 30 were analysed for elemental composition of major oxides and trace elements, using XRF and ICPMS techniques respectively. Petrographic study shows that the area is underlain by Biotite Gneiss, Migmatitic Gneiss, Augen Gneiss, Banded Iron Formation (BIF), Quartzite, Quartz-mica Schist, Porphyritic Granites, Coarse-grained Granite, Quartz Diorite and Pegmatite. Structural data shows a dominant NNE-SSW trending lineaments with minor complimentary NNW-SSE trends. The Total Magnetic Intensity and Reduce to Equator images from aeromagnetic anomaly data were used to enhance existing inferred geological boundaries of adjoining lithological units. The Total Magnetic Intensity map (TMI) depicts magnetic anomaly values that ranges between 52.5- 85.2. The map also shows prominent high magnetic anomaly (71.5nT- 84.0nT) in rocks of the eastern part of the area. The molecular plot of Al₃O₂/CaO+Na₂O₃+K₂O versus SiO₂ reveals that the pegmatites have I-type characteristics. The K/Rb vs Cs discrimination diagram indicates that the pegmatites of the Egbe, Omi, Takete and Idofin areas are of the mineralized type. The geochemistry of some selected pegmatite samples shows enriched concentration values in ppm of 716.10, 19.68, 37.40, 92.00 and 481.70 for Rb, Cs, Ta, Sn and Nb respectively. These suggests that the pegmatites are rare metal type with enrichment trend of Rb>Nb>Sn>Ta>Cs, with strong negative Eu anomalies, suggesting that the pegmatites are of LCT-type. Ore microscopic studies show that the pegmatites are associated with tantalite, pyrite, chalcopyrite, tourmaline, and galena ores of economic values as evidenced in the high level of artisanal mining activities in the areas. Keywords: rare metal, pegmatite, enrichment, anomaly, artisanal mining