Groundwater geochemical evolution,origin and quality in the Lower Pra Basin,Ghana:Insights from hydrogeochemistry,multivariate statistical analysis,mineral saturation indices,stable isotopes(δ^(2)H and δ^(18)O)and geostatistical analysis  

作　　者：Samuel Y.Ganyaglo Joel Y.Binyiako Emmanuel M.Teye Abass Gibrilla Dickson Abdul-Wahab Samuel Edusei Paulina Amponsah Courage D.Egbi Samuel B.Dampare Ebenezer Aquisman Asare 

机构地区：[1]Graduate School of Nuclear and Allied Sciences,University of Ghana,Legon-Accra,Ghana [2]Water Resources Research Centre,National Nuclear Research Institute,GAEC,Box LG 80,Kwabenya-Accra,Ghana [3]National Data Centre,National Nuclear Research Institute,Ghana Atomic Energy Commission,Accra,Ghana [4]Ward West Africa,P.O Box DBE 92,Daboase,Wass East,Western Region,Ghana

出　　处：《Acta Geochimica》2025年第2期348-372,共25页地球化学学报(英文)

摘　　要：In many places across the globe,including the Wassa District of Ghana,groundwater provides a significant supply of water for various purposes.Understanding the groundwater origin and hydrogeochemical processes controlling the groundwater chemistry is a major step in the sustainable management of the aquifers.A total of 29groundwater samples were collected and analysed.Ionic ratio graphs,multivariate statistical analysis,mineral saturation indices,stable isotopes,and geostatistics methods were used to examine the sources and the quality of the groundwater.The findings describe the water types in the district as Ca-Mg-HCO_(3)-Cl,Ca-Na-HCO_(3),Na-Ca-HCO_(3),Ca-Na-HCO_(3)-Cl,Na-Ca-HCO_(3)-Cl,mix water type,NaHCO_(3)-Cl,with possible evolution to Ca-Na-Cl-HCO_(3),and Na-Ca-Cl-HCO_(3).According to the IEWQI for drinking water,around 53.6% of the samples have good quality,whereas 10.7% have very low-quality groundwater.Only 3.45% of the samples are suitable to use for irrigation without treatment,whereas 41.4% are somewhat safe with minimal treatment.Water-rock interactions,including the dissolution and weathering of silicate minerals,cation exchange processes,and human activities like mining andquarrying,are some of the main factors influencing groundwater chemistry.Principal component analysis revealed that groundwater chemistry is influenced by a combination of natural and anthropogenic sources.The APCs-MLR receptor model quantifies the factors that play important roles in groundwater salinization,including mineral dissolution and weathering(19.4%),localised Cd(16%),Ni(14.6%),Pb(12.8%),and Fe(11.4%)contamination from urbanisation while unidentified sources of pollution account for about 26.0%.The stable isotopes revealed groundwater is of meteoric origin and water-rock interaction the major mechanism for groundwater mineralization.The results of this research highlight the need of implementing an integrated strategy for managing and accessing groundwater quality.

关 键 词：GROUNDWATER Integrated approaches Stable isotopes Hydrochemical facies Water-rock interaction Quality assessment Empirical Bayesian kriging 

分 类 号：P64[天文地球—地质矿产勘探]