Browsing by Author "Bakare, Ussein Taiwo"

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    Stable Isotopic Signatures (18O and 2H) and Hydrochemistry in Assessing Basement Aquifer Recharge and Driving Forces of Groundwater Quality in Parts of Ilorin, Northcentral Nigeria
    (University of Technology Sarawak, 2025-01-14) Yusuf, Mumeen Adebayo; Abiye, Tamiru Alemayehu; Alao, Joseph Omeiza; Ibrahim, Kehinde Olojoku; Oyeleke, Tolulope Ayobi; Awujo, Emmanuel Daberechukwu; Omotoso, Oladele Ajiboro; Iheme, Kenneth Obinna,; Bakare, Ussein Taiwo; Omorinoye, Omolayo Ajoke
    Groundwater resources in parts of Asa Local Government Area in Kwara State, Nigeria are threatened by increasing pressure due to growing population, and agricultural and industrial activities, which necessitates a comprehensive assessment of the groundwater resources to ensure their sustainability and safety for human consumption. Evaluation of groundwater resources in parts of Asa Local Government Area in Kwara State, Nigeria was undertaken using the integration of stable isotope of δ18O and δ2H and hydrogeochemical tools including Water Quality Indexes, Gibbs diagrams, and Chadha diagram towards deciphering the source of groundwater recharge as well as factors controlling its chemistry in the study area. The collected groundwater samples from shallow wells and deep boreholes were subjected to major ions, trace elements, and isotope analyses. Hydrochemical models revealed Ca-Mg-HCO3, mixed Ca-Na-HCO3, and Na-HCO3 water facies suggesting the early transformation stage of the groundwater. The WQI indexes ratings revealed essentially fair to good to excellent water quality for human consumption. The isotope values in groundwater samples vary between - 4.12±0.1 ‰ and -2.60±0.1 ‰ and between -15.0±0.2 ‰ and -24.0±0.2 ‰ for δ18O and δ2H, respectively, indicating isotopically relatively enriched groundwater. The plot of δ18O and δ2H in groundwater samples along meteoric lines indicate meteoric origin with little effect of evaporation. Residence time evaluation using Ec and δ18O relationship identified recent recharge and recent recharge but polluted groundwater. In addition, the relation between salinity and δ18O revealed water-rock interaction as the main geochemical process controlling groundwater chemistry.