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Identifying the origin and geochemical evolution of groundwater using hydrochemistry and stable isotopes in the Subei Lake basin, Ordos energy base, Northwestern China

机译:Identifying the origin and geochemical evolution of groundwater using hydrochemistry and stable isotopes in the subei Lake basin, Ordos energy base, Northwestern China

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摘要

A series of changes in groundwater systems caused by groundwater exploitation in energy base have been of great concern to hydrogeologists. The research aims to identify the origin and geochemical evolution of groundwater in the Subei Lake basin under the influence of human activities. Water samples were collected, and major ions and stable isotopes (delta O-18, delta D) were analyzed. In terms of hydrogeological conditions and the analytical results of hydrochemical data, groundwater can be classified into three types: the Quaternary groundwater, the shallow Cretaceous groundwater and the deep Cretaceous groundwater. Piper diagram and correlation analysis were used to reveal the hydrochemical characteristics of water resources. The dominant water type of the lake water was Cl-Na type, which was in accordance with hydrochemical characteristics of inland salt lakes; the predominant hydrochemical types for groundwater were HCO3-Ca, HCO3-Na and mixed HCO3-Ca-Na-Mg types. The groundwater chemistry is mainly controlled by dissolution/precipitation of anhydrite, gypsum, halite and calcite. The dedolomitization and cation exchange are also important factors. Rock weathering is confirmed to play a leading role in the mechanisms responsible for the chemical composition of groundwater. The stable isotopic values of oxygen and hydrogen in groundwater are close to the local meteoric water line, indicating that groundwater is of modern local meteoric origin. Unlike significant differences in isotopic values between shallow groundwater and deep groundwater in the Habor Lake basin, shallow Cretaceous groundwater and deep Cretaceous groundwater have similar isotopic characteristics in the Subei Lake basin. Due to the evaporation effect and dry climatic conditions, heavy isotopes are more enriched in lake water than in groundwater. The low slope of the regression line of delta O-18 and delta D in lake water could be ascribed to a combination of mixing and evaporation under conditions of low humidity. Comparison of the regression line for delta O-18 and delta D showed that lake water in the Subei Lake basin contains more heavily isotopic composition than that in the Habor Lake basin, indicating that lake water in the discharge area has undergone stronger evaporation than lake water in the recharge area. Hydrochemical and isotopic information of utmost importance has been provided to decision makers by the present study so that a sustainable groundwater management strategy can be designed for the Ordos energy base.
机译:水文地质学家非常关注由能源基地中的地下水开采引起的一系列地下水系统变化。该研究旨在确定在人类活动影响下苏北湖盆地地下水的起源和地球化学演化。收集水样品,并分析主要离子和稳定同位素(δO-18,δD)。从水文地质条件和水化学数据的分析结果来看,地下水可分为三类:第四纪地下水,白垩纪浅层地下水和白垩纪深层地下水。利用吹笛图和相关分析揭示了水资源的水化学特征。湖泊水的优势水类型为Cl-Na型,符合内陆盐湖的水化学特征。地下水的主要水化学类型是HCO3-Ca,HCO3-Na和混合HCO3-Ca-Na-Mg。地下水化学主要受硬石膏,石膏,盐石和方解石的溶解/沉淀控制。去离子化和阳离子交换也是重要的因素。岩石风化被证实在负责地下水化学成分的机理中起着主导作用。地下水中氧气和氢气的稳定同位素值接近当地的大气水线,表明地下水具有现代的本地气象起源。与哈伯湖流域浅层地下水和深层地下水的同位素值差异显着不同,苏北湖盆地浅层白垩纪地下水和深层白垩纪地下水具有相似的同位素特征。由于蒸发作用和干燥的气候条件,湖水中的重同位素比地下水中的重同位素更富集。湖泊水中三角洲O-18和三角洲D回归线的低斜率可归因于低湿度条件下混合和蒸发的结合。通过比较O-18和D值的回归线可以看出,苏北湖流域的湖水同位素含量高于哈伯湖流域的同位素组成,这表明流域的湖水蒸发量比湖水强。在充电区。本研究已向决策者提供了最重要的水化学和同位素信息,以便可以为鄂尔多斯能源基地设计可持续的地下水管理策略。

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