摘要：Major ion concentrations were measured in 22 groundwater samples collected from a coal bearingaquifer in Zhuxianzhuang coal mine, northern Anhui Province, and the ion source and geochemicalcharacteristics were discussed by the methods such as traditional graphic and multivariate statisticanalysis. The results showed the presence of three water types, i.e., HCO3-Na, Cl-Na and SO4-Na.The surrounding rock weathering and evaporation, both controlled the chemical characteristics ofgroundwater, evidenced by the Gibb’s diagrams. In detail, the features of ion ratios such as Ca/Na,HCO3/Na and Mg/Na show that the evaporate dissolution and silicate weathering were the dominantwater-rock interactions. Multivariate analysis, such as correlation analysis, cluster analysis and FAanalysis were also conducted to reveal the ion source in groundwater, and the Ca2+ and Mg2+ weremainly released from the dissolution of gypsum and/or magnesium and/or anorthite; while the Na+ isinfluenced by the weathering of feldspar and halite, with the cation exchange in a certain extent. Incontrast, the Cl-, HCO3- and SO42- are also controlled by the halite dissolution, silicate mineral weatheringand sulphate mineral dissolution, respectively. In addition, the SO42- in groundwater could be influencedby the oxidation of pyrite, which is abundant in the coal bearing aquifers.
