为查明新疆巴里坤-伊吾盆地地下水水化学特征及其成因,采用数理统计、Piper三线图、Gibbs图、离子比例系数等方法对研究区2011年9月的75组地下水水样测试结果进行分析.研究结果表明,潜水以HCO3和SO4型水为主,承压水以SO4型水为主,两者都是矿化度中等、硬度中等的弱碱性水;Gibbs图表明,研究区潜水水化学成分主要受蒸发浓缩和岩石风化双重作用的影响,承压水补给水源的水化学成分主要受蒸发浓缩作用影响;离子比例系数法及饱和指数表明潜水和承压水中离子主要来自岩盐、硫酸盐、硅酸盐的风化溶解.此外,(Na+-Cl-)与(Ca2+ +Mg2+)-(SO42-+HCO3-)之间的比值关系表明阳离子交换作用也是地下水中化学组分形成的重要作用之一.
To investigate the chemical characteristics and formation mechanism of groundwater in plain areas of Barkol-Yiwu Basin,Xinjiang,the test data of 75 groundwater samples were analyzed by mathematical statistics,Piper diagram,Gibbs diagram,iron rationanalysis,etc.The results showed that the main hydrochemistry types of unconfined groundwater were HCO3 water and SO4 water,the main hydrochemistry types of confined groundwater were SO4 water,and both types were weak alkaline,which belonged to medium hardness of water.Gibbs diagram showed that the hydrochemical compositions of unconfined groundwater in the study area were mainly controlled by evaporation and rock weathering,the hydrochemical composition of the recharge source of the confined groundwater were mainly controlled by evaporation.Ion ratio analysisand mineral saturation indices showed that the major sources of ions in the study area were mainly the dissolution of halite,sulfate and silicate.The ratio relationship between (Na+-Cl-) and (Ca2++Mg2+)-(SO42-+HCO3-)demonstrates that cation exchange is a major mechanism controlling the composition of groundwater.
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