新集矿区深层地下水水文地球化学特征与成因分析

以淮南新集矿区深层地下水充水含水层为研究对象，采集新集矿区不同层位的水样，测试水样的阴阳离子浓度，采用统计分析及离子比例系数分析法对砂岩水、推覆体片麻岩、推覆体寒灰水、奥灰水、太灰水5个含水层的74个水样数据进行了分析。结果显示:研究区深层地下水属弱碱性水，阳离子以Na⁺+K⁺为主，阴离子以Cl^-为主，奥灰水中Ca²⁺和SO^2-₄的浓度较大，水化学类型主要以Cl-Na和Cl（HCO₃）-Na型为主；水化学特征主要由浓缩作用和碳酸盐、硫酸盐溶解共同作用，其中大部分水样主要由岩盐溶解控制，新集矿区深层地下水的水化学特征主要由浓缩作用和硫酸盐溶解作用共同控制，砂岩水主要发生的是阳离子交换以及碳酸盐、硫酸盐溶解作用，推覆体片麻岩和推覆体寒灰水可能发生溶滤作用和阳离子交换作用。

Hydrogeochemical characteristics and formation analysis of deep groundwater in Xinji Mining Area

Taking the deep groundwater aquifer of Xinji Mining Area in Huainan as the research object，the water samples of different layers in Xinji Mining Area were collected，and the concentration of anion and cation in water samples was tested.The data of 74 water samples from 5 aquifers，namely sandstone water，nappe gneiss，nappe Cambrian limestone water，Ordovician limestone water and Taiyuan limestone water，were analyzed by statistical analysis and ion proportion coefficient analysis.The results show that the deep groundwater in the study area belongs to weakly alkaline water，the cations are mainly Na⁺+K⁺，and the anions are mainly Cl^-，and the concentrations of Ca²⁺ and SO^2-₄ in Ordovician limestone water are relatively high，and the hydrochemical types are mainly Cl-Na and Cl（HCO₃）-Na.The hydrochemical characteristics are mainly controlled by concentration，carbonate and sulfate dissolution.Most of the water samples are mainly controlled by rock salt dissolution.The hydrochemical characteristics of deep groundwater in Xinji Mining Area are mainly controlled by concentration and sulfate dissolution.The sandstone water mainly occurs in cation exchange，carbonate and sulfate dissolution，and the nappe gneiss and nappe Cambrian water may have leaching and cation exchange.