Browsing by Author "Alkali, Y. B."

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Biostratigraphy and Depositional Environments of Wells BB-3, D-01 and BL-1X Deep Offshore, Niger Delta Basin, Nigeria: Insights from Palynological Studies
(Journal of Natural and Applied Sciences, 2022-06) Usman, H.O.; Unuevho, C. I.; Chukwuma-Orji, J. N.; Alkali, Y. B.
Biostratigraphic studies was carried out on BB-33, D-01 and BL-1X wells deep offshore Niger Delta Basin Nigeria. Palynological analysis was carried out on 295 ditch cuttings samples (BB-3 =82, D-01 =109, and BL-1X = 104). Open hole geophysical log data was also provided for the studied intervals 10700-15600 ft, 8060-16800 ft and 7900-13000 ft in BB-3, D-01 and BL-1X wells respectively belonging to the Agbada Formation. Lithologically, the section varies from alternation of sand and shale units with carbonaceous debris, mica flakes, ferruginised materials and glauconites at some intervals as accessory minerals. Palynomorphs recovered from the analyzed intervals were mainly Zonocotites ramonae, Monoporites annulatus, fungal spores/hypae, species of Sapotaceoidaepollenites and Laevigatosporites and were found to dominate the microfloral assemblage of the analyzed intervals. Sphaeromorph, acritarch, species of Leoisphaeridia coupled with Pediastrium, Botryococuss, Operculodinium centrocarpum, Lingulodinium machaerophorum, Achomosphaera ramulifera, Spiniferites ramosus and indeterminate dinoflagellate cysts were the marine indicators present. Samples from the section are dated early Miocene to early Pliocene age based on the independent paleontological evidences. The deduced depositional environments of the strata penetrated by the wells range from outer neritic through bathyal to deep marine.
Environmental Impact of Artisanal Gold Mining on Soils in Saigbe and Environs, Part of Minna Sheet 164, North-Central Nigeria
(Minna Journal of Geosciences (MJG), 2017) Omanayin, Y. A.; Abdurrahman, R.; Akande, W. G.; Mamodu, A.; Alkali, Y. B.; Alabi, A. A.
The environmental geochemistry of soils from Saigbe and environs, Minna, North-central Nigeria was studied in an attempt to assess the impacts of artisanal gold mining activity in Saigbe and environ. Geological fieldwork carried out in the area revealed that the underlying lithologies include schist, granite and amphibolite. A geochemical soil survey was also carried out and a total number of twenty (20) soil samples were systematically collected from both mined and unmined sites within the study area, of which eight (8) representative samples were geochemically analyzed. Elemental concentrations (major and trace elements) in the soil samples were determined using X-Ray fluorescence (XRF) technique. The physical impacts observed during fieldwork in the area include loss of vegetation, land degradation, water pollution and abandoned pits. The average concentrations of the elements determined were compared with the published upper crustal abundance of the individual elements and subsequently their enrichment ratios were computed. Elements such as Ag, Au and Hg show high enrichment with 1.81 ppm, 0.03 ppm and 0.11 ppm concentrations respectively. The result from accumulation index (Igeo) also shows possible Hg contamination. This potentially toxic element can cause serious damage to the skin, nervous and digestive systems in man through direct or indirect consumption.
FORAMINIFERAL BIOSTRATIGRAPHY AND PALEOENVIRONMENT OF WELL BL-1X, DEEP OFFSHORE, NIGER DELTA BASIN, NIGERIA
(Journal of Natural and Applied Sciences, 2022-06) Usman, H. O.; Unuevho, C .I.; Chukwuma-Orji, J. N.; Alkali, Y. B.
Foraminiferal biostratigraphic analysis was carried out using one hundred and sixty (160) ditch cutting samples from BL-1X well, deep off-shore Niger Delta basin Nigeria. The interval studied is 7710 – 13020 ft belonging to the Agbada Formation. Lithologically, the section varies from shaly-sand to sandy-shale to shale. Biozonation included four planktonic zones, the proposed planktonic zones are: Globgerinoides extremus - G. humerosa zone – interval zone, Globorotalia acostaensis zone – taxon range zone, Globorotalia foshi peripherronda – Globigerinatella insueta – interval zone, Catapsydrax stainforthi zone – taxon range zone which are correlatable with the zones of previous workers. Samples from the section was dated early to late Miocene based on paleontological evidences. Sediments of well BL-1X were deposited in the lower-upper bathyal environment based on environmentally restricted benthic species.
Physico-Chemical and Mineralogical Characteristics of Obajana Marble Deposit, Central Nigeria: Implication for Economic Appraisal
(Nigeria Journal of Engineering and Applied Sciences (NJEAS), 2018) Alkali, Y. B.; Lawal, O. H.; Omanayin, Y. A.
Marble is one of such minerals occurring in Obajana area that can be exploited for various uses other than cement production that the area is well known for. Hence, the continuous investigation into its economic viability can never be over emphasized. The physical, geochemical and mineralogical attributes of Obajana marble was investigated for the purpose of its economic potential. Obajana marble is closely associated with meta-sedimentary and granitoid rock assemblages of the Precambrian Lokoja - Jakura Schist Belt of central Nigeria. Thirty (30) representative samples were collected from the bench crest and bench trough from the 3 pits investigated based on variation of colour, texture and structure during field investigations .Physical properties were determined for while optical microscope and X-ray fluorescence techniques were used to discern mineralogical and chemical composition of the samples. The colour ranges from whitish to dark colour minerals, with traces of brownish colour and are very attractive based on physical look. Physical parameters for the marble indicated varied compressive strength (13.84 – 93.60 MPa), hardness (3.05), specific gravity (2.72), colour brightness (83) and pH (8.3). Chemical data showed pit 1, CaO (50.30 - 53.99%); MgO (0.00 -0.38 %); pit 2, CaO (48.31 - 51.87 %); MgO, (0.41 - 1.63%) and pit 3, CaO (49.39 - 52.93%); MgO (0.06 - 1.19 %) and in general reveal calcitic marble by virtue of the CaO : MgO ratios of the marble bodies. Also, mineralogy reveals that samples are composed mainly of calcite, with minor amounts of dolomite, quartz, magnesium oxide and iron. Appraisals of the functional potential of the marble based on physical, geochemical and mineralogical characteristics indicate that Obajana marble is suitable for cement feedstock, iron and steel fluxes, fillers in paints and paper making and as extenders in the manufacture of glass as well as useful in water treatment.