托克逊两河流域地下水化学组分来源及同位素指示作用分析

Analysis of Chemical Components Source and Isotopic Indices of Groundwater in Toksun River Basin

通过对托克逊两河流域32组水样中的化学成分及环境同位素进行测定,运用聚类、Piper三线图、Gibbs图、离子比例系数法对化学组分来源进行分析,并对研究区水环境同位素特征进行分析,确定该区域地下水的水化学作用及组分来源。结果表明:沿阿拉沟渠从出山口山前砾质洪积平原→细土平原→盐沼平原过渡区地下水由HCO_3型→HCO_3·SO_4型、SO_4·HCO_3型→SO_4·CL型;地下水化学作用同时受蒸发浓缩作用、溶滤作用和阳离子交替吸附作用的影响,地下水化学组分来自盐类矿物的溶解;地下水δ^(18)O平均值为-0.889%,δD平均值为-5.668%,浅表层水δ^(18)O平均值为-0.938%,δD平均值为-6.005%,山区降水经二次转化对地下水补给产生一定的影响,远离当地大气降水线的水样受补给源和人工开采的影响。

The chemical composition and environmental isotopes in 32 groups of water samples in the Toksun river basin were determined,and the chemical components sources were analyzed by using clustering,Piper three-line maps,Gibbs diagrams and ion-proportionality coefficients method,and the isotopic characteristics of water environment in the study area were also analyzed to determine the hydrochemistry and composition of groundwater in the area.The results showed that the groundwater along the Aragou river system from the gravel diluvial plain in front of the mountain mouth to the fine soil plain to the salt marsh plain is from HCO3 type to HCO3·SO4 type,SO4·HCO3 type and SO4·CL type;the groundwater chemistry is also influenced by evaporation and concentration,leaching and cation exchange adsorption;the chemical composition of groundwater comes from the dissolution of salt minerals;the average value of groundwaterδ18O is-0.889%,the average value ofδD is-5.668%,the average value of shallow surface waterδ18O is-0.938%,and the average value ofδD is-6.005%;the precipitation in mountainous areas has a certain influence on the groundwater recharge through the secondary transformation.The water samples far away from the local atmospheric precipitation line are affected by the supply source and artificial mining.