河南省某大型水源地岩溶水水化学及同位素特征  

Chemical and isotopic characteristics of the karst groundwater in the wellfield in Henan Province

作　　者：蔡月梅 蔡五田[1] 刘金巍[1] 边超[1] 吕永高[1] 刘江涛[1] 曹月婷[1] 李敬杰[1] CAI Yuemei;CAI Wutian;LIU Jinwei;BIAN Chao;LYV Yonggao;LIU Jiangtao;CAO Yueting;LI Jingjie(Center for Hydrogeology and Environmental Geology,CGS,Baoding,Hebei 071051,China)

机构地区：[1]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《水文地质工程地质》2018年第5期41-47,共7页Hydrogeology & Engineering Geology

基　　金：国家重点研发计划科技基础资源调查专项(2017FY100401);中国地质调查局项目(DD20160310)

摘　　要：河南省某岩溶水源地是该市大型供水水源地,近年来,在水源地岩溶水周边水井中检出了微量重金属,引起有关部门和水文地质工作者的高度关注。查明水源地岩溶水的补给来源、补给途径及其与上覆第四系含水层的关系,识别重金属污染风险,成为保护该水源地的重要任务。根据水源地开采井水化学及同位素取样分析结果,对水源地地下水化学组分的水文地球化学过程及补给来源进行了初步研究。研究表明,水源地岩溶水中的宏量阳离子组分主要来自碳酸盐岩中文石、方解石、白云石的溶解;水源地岩溶水的主要补给来源是北部山区的大气降水;不同水井之间水化学及同位素存在较大差异,主要是由于水井开采深度和补给过程差异造成的;水源地某些水井中Cl-离子和NO-3离子浓度较高,表明可能受到了上部第四系含水层或地表人类活动的影响,应引起有关部门的重视。The Qingduo karst groundwater wellfield is a large-scale water-supply source in the city of Jiyuan in Henan Province.In recent years,trace amounts of heavy metals have been detected in groundwater around the wellfield to which high attention has been pain by the relevant departments and hydrogeologists.Identifying the recharge source and flow path to the karst groundwater,and the relationship between the karst groundwater and the overlying Quaternary aquifer,and recognizing the risk of heavy metal pollution are important in the protection of the water source.Based on the results of chemical and isotopes analyses of groundwater in the wellfield area in 2016,we examined the hydrogeochemical processes and the recharge sources of the groundwater.The results show that the major cation components in the karst groundwater mainly come from the incongruent dissolution of aragonite,calcite and dolomite in carbonate rocks and the main recharge resource of the karst groundwater is the precipitation in the northern mountainous areas.The significant differences in hydrochemistry and stable isotopes among different wells come from different pumping depths and recharge processes.High concentrations of Cl-and NO-3 in some of the karst groundwater indicate that they may be affected by the upper Quaternary aquifers or human activities,which should be paid more attention by relevant departments.

关 键 词：水源地 岩溶水 同位素 补给来源 水文地球化学作用 

分 类 号：P641.134[天文地球—地质矿产勘探] P641.3[天文地球—地质学]