新疆喀什噶尔河流域高硫酸盐地下水水化学特征及成因分析  

Hydrochemical characteristics of high-sulfate groundwater in Kashgar river basin,Xinjiang

作　　者：曾小仙 曾妍妍[1,2,3] 周金龙 鲁涵[1,2,3] ZENG Xiaoxian;ZENG Yanyan;ZHOU Jinlong;LU Han(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Hydrology and Water Resources Engineering Research Center,Urumqi 830052,China;Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention,Urumqi 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052 [2]新疆水文水资源研究中心,乌鲁木齐830052 [3]新疆水利工程安全与水灾害防治重点实验室,乌鲁木齐830052

出　　处：《干旱区资源与环境》2022年第3期128-135,共8页Journal of Arid Land Resources and Environment

基　　金：新疆自治区自然科学基金项目(2019D01B18);新疆农业大学水利工程重点学科项目(SLXK2019-10);国家自然科学基金项目(41662016)资助。

摘　　要：新疆喀什噶尔河流域地下水水化学指标严重超标,尤其是SO_(4)^(2-)超标率高达78.9%,是水质型缺水地区。文中采用描述性统计分析水化学特征,相关性分析、主成分分析和δ^(34)S-SO_(4)^(2-)关系探究地下水硫酸盐富集的原因。结果表明:研究区地下水呈弱碱性,主要是微咸水和咸水,阴阳离子分别以SO_(4)^(2-)和Na^(+)为主导,离子含量的空间差异较大。SO_(4)^(2-)含量整体呈现上游至下游递增的趋势。地下水中常量组分主要来源于岩盐和石膏等蒸发岩矿物、方解石和白云石等碳酸盐矿物的风化溶解,同时受水环境酸碱度的影响。地下水中SO_(4)^(2-)的富集主要受到海陆交互相沉积区和陆相沉积区蒸发岩的溶滤作用,硫化物矿物的氧化作用和人类活动的影响。The chemical indexes of groundwater in Kashgar river basin of Xinjiang had seriously exceeded the standard,especially the exceeding rate of SO_(4)^(2-) is as high as 78.9%.The study area is a water quality type of water-deficient area.Descriptive statistic was used to analyze the hydrochemical characteristics.Correlation analysis,principal component analysis and the relationship betweenδ^(34)S and SO_(4)^(2-) were used to explain the causes of high-sulfate groundwater.The results showed that the groundwater is weakly alkaline,mainly brackish water and saline water,and the anions and cations are dominated by SO_(4)^(2-) and Na^(+),and the spatial difference of ion concentration is great.The SO_(4)^(2-) concentration generally increases from upstream to downstream.The major components in groundwater are mainly originated from the weathering and dissolution of evaporative rock minerals such as halite and gypsum,and carbonate minerals such as calcite and dolomite,which are also affected by the pH of the water environment.The enrichment of SO_(4)^(2-)in groundwater is mainly affected by the leaching of evaporative rock in the sea-land interfacing sedimentation zone and terrestrial sedimentation zone,the oxidation of sulfide minerals,and the human activities.

关 键 词：高硫酸盐 水化学特征 同位素 喀什噶尔河流域 

分 类 号：P641.4[天文地球—地质矿产勘探]