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- ItemSTREAM SEDIMENT SURVEY OF ERUKU AND ITS ENVIRONS, CENTRAL NIGERIA: IMPLICATION FOR EXPLORATION(IJRRAS, 2011-07-17) Bamigboye, O.S. & Adekeye, J.I.D.Eruku and its environs lie within two belts of different lithologies (Osi migmatite – gneiss complex to the west and Egbe schist belt to the east) which have been well studied. This area has remained relatively uninvestigated in terms of mineralization and hence its mineralization potential is unknown. This work therefore aims at identifying the mineralization types and also to delineate the mineralized zones in this area. In order to achieve these objectives, stream sediments sampling in Eruku and its environs was carried out. The stream sediments were collected at the confluence points of two or more rivers mostly at a depth of 20 – 25cm. The stream sediment samples were analyzed for trace and rare-earth elemental concentration using ICP-MS analytical method. The result of the geochemical analysis was thereafter subjected to multivariate statistical analysis and isograde plotting. The multivariate analysis shows a total of five factor groups. Four of the five factor groups are related to mineralization. From the dendogram, a total of six cluster groups were distinct, three of these groups are related to mineralization while the other three are considered to be product of weathering and erosion of both mineralized and barren rocks in the study area. The correlation analysis of some selected elements from the result of the geochemical analysis shows Cs, Nb, Sn, Ta, Cu, Mo, Ni, V, Zn, Co among others to be strongly correlated while Ba is negatively or not correlated with most of the elements. The isograde plots show that almost all the elements have their peaks in the south-eastern part of the study area. The conclusion drawn from the integration of the geochemical analysis, multivariate analysis and isograde plotting in this study is that the study area is mineralized with tantallite-cassiterite-columbite. These mineralizations are hosted by pegmatites that intrude the country rocks in the southeastern part of the study area. Also, these mineralisations are similar to the mineralization type in Egbe that lies to the east of the study area in terms of their host rocks and mineralization type
- ItemBiostratigraphy and Palaeoecological Studies of the Late Cretaceous-Tertiary Sediments in the Dahomey Basin, Nigeria(European Journal of Environment and Earth Sciences, 2022-07-04) Mariam B. Saadu, Ayoola Y. Jimoh, Olabisi A. Adekeye, and Taofeeq A. IssaThe Maastrichtian–Eocene sediments (mainly shales and limestones) penetrated by the Itori borehole and Ilaro boreholes in the Dahomey Basin were investigated for foraminiferal biostratigraphy and palaeoecological interpretation. These boreholes penetrated Araromi, Ewekoro, and Oshosun formations at varying depths. Selected shale sediments were subjected to foraminiferal analysis and many planktonic and benthic species of foraminifera (agglutinated and calcareous) were recovered from the Cretaceous interval of the penetrated boreholes. Twelve species of planktic foraminifera (Globalomalina planocompressa, G. pseudomenardii, Globigerina inaequispira, Acarinina Chiloguembelina cretacea, cf.coalingenis, Acarinina chiloguembelina Orthokasrstenia sp., Hedbergella holmdelensis, Globigerina sp., Globigerinelloids asperus, Morozovella formosa formosa) and thirteen species of benthic i.e Bolivina sp., B. Crassicostata, , E. africana, Eponides psuedoelevatus, Gavelinella cf. guineana, Gavelinella pachysuturalis, Haplophragmiodes sp., Lenticulina cyprina, L. inornata, L. olokuni, L. psuedomamilligera, L. taylorensis, Nonionella communis, N. spissa, N. panamensis, Orthokarstenia sp., Planulina oyae) were identified. In general, benthic species of infauna deposit feeder and epifauna dominate the population. These species occupy a range of environments from dyoxic to anoxic, brackish water to marsh environment down to upper bathyal depth. Based on the abundant and stratigraphical distribution of the foraminiferal species, four biostratigraphic zones were recognized: Afrobolivina afra zone of late Maastrichtian, Globigerina zone of early Paleocene, Globalomalina pseudomenardii zone of late Paleocene and Morozovella formosa formosa zone of the early Eocene.
- ItemUpward Continuation and Reduction to Equator Filters on Aeromagnetic Data of parts of Bida Basin, Nigeria(Ilorin Journal of Science, 2024-11-03) Issa T. A, Olatunji S. and *Omolaiye G. ETo enhance the aeromagnetic maps covering six data sheets encompassing the Mokwa, Egbako, Bida, Lafiagi, Pategi, and Baro regions of the Bida Basin, Nigeria, this research employs two magnetic filtering techniques. The aim is to refine the maps for a better representation of the study area. The study intends to improve the interpretation of aeromagnetic data by better identifying depth discrepancies and differentiating between shallow and deep-seated magnetic sources within the surveyed region using upward continuation (UC) and reduction to the magnetic equator (RTE) filters. Variations in anomalies observed in both total magnetic intensity and reduction to the equator can be attributed to lithological differences, depth variations, strike angles, magnetic susceptibility variations, or the presence of basement complex rocks with varying concentrations of magnetic materials.
- ItemGeothermal parameter assessment in the Southwestern Sokoto Basin, Nigeria, using spectral analysis (centroid method)(Nigerian Society of Physical Sciences, 2024-06-12) U. Z. Magawata, N. K. Olasunkanmi, T. A. IssaThis study utilized spectral analysis (centroid method) to assess geothermal parameters in the southwestern part of the Sokoto Basin, Nigeria. The high-resolution airborne data comprised forty-nine (49) overlapping blocks, and each block was divided into 55x55 km to evaluate essential parameters such as depth to the top boundary (Zt), centroid depth (Zo), and magnetic source bottom (Zb = 2Zo-Zt). The analysis revealed variable Curie points depths (CPD), ranging from 3.89 km to 26.56 km. The lowest CPD is primarily associated with basement rocks within anomalies A, B, C, D, E, F, G, H, and I, with an average CPD of 9.16 km. Furthermore, the thermal gradients ranged from 21.84 ◦C/km to 149.10 ◦C/km, with an average thermal gradient of 73.30 ◦C/km. The heat flow exhibited variations between 54.81 mW/m²and 374.24 mW/m², with average heat flow of 180.4 mW/m², indicating significant geothermal potential zones. The high thermal gradients and heat flow regions were identified, around anomalies A, B, and C. Additionally, temperature gradients identified at shallow depths ranged from 110 ◦C/km to 150 ◦C/km. The results reveal the presence of high-temperature points and anomalous geothermal potentials, particularly within anomalies A, B, and C, thus requiring further investigation for sustainable geothermal energy generation in the study area.
- ItemGeochemistry 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 AkinpeluAnambra 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