2023 Vol. 50, No. 1
Article Contents

WEI Shibo, WANG Zhe, LI Fei, WU Xi, XU Rongzhen. 2023. Characteristics of hydrogen and oxygen stable isotopes and hydrochemistry in the groundwater of Ejina plain, Inner Mongolia and its hydrochemical evolution[J]. Geology in China, 50(1): 159-169. doi: 10.12029/gc20230112
Citation: WEI Shibo, WANG Zhe, LI Fei, WU Xi, XU Rongzhen. 2023. Characteristics of hydrogen and oxygen stable isotopes and hydrochemistry in the groundwater of Ejina plain, Inner Mongolia and its hydrochemical evolution[J]. Geology in China, 50(1): 159-169. doi: 10.12029/gc20230112

Characteristics of hydrogen and oxygen stable isotopes and hydrochemistry in the groundwater of Ejina plain, Inner Mongolia and its hydrochemical evolution

    Fund Project: Supported by the project of National Key Research and Development Program (No.2017YFC0403502)
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  • Author Bio: WEI Shibo, male, born in 1992, master, engineer, mainly engaged in hydrogeology and water resources investigation and evaluation; E-mail: 1013233143@qq.com
  • Corresponding author: WANG Zhe, male, born in 1982, master, senior engineer, mainly engaged in groundwater resources and environment research; E-mail: 972636980@qq.com 
  • This paper is the result of mineral exploration engineering.

    Objective

    In order to study the hydrochemical characteristics and evolution of groundwater in the Ejina plain, Inner Mongolia, 87 water quality samples and 69 hydrogen and oxygen isotope samples were collected in August 2020.

    Methods

    Based on the methods of mathematical statistics, ion ratio, and hydrogeochemical simulation, the hydrogeochemical characteristics and the hydrochemical evolution rule of groundwater stored in Quaternary aquifer and Cretaceous aquifer were analyzed.

    Results

    The results showed that: (1) The groundwater was mainly SO4-Na type. SO42- was the main anion, followed by Cl-. Na+ was the main cation, followed by Ca2+ and Mg2+, there was little difference between Ca2+ and Mg2+ concentrations. (2) The concentrations of SO42-, Cl-, TDS, total hardness, Na+ and Mg2+ decreased in the order of Quaternary confined water> Quaternary phreatic water> Cretaceous confined water. (3) Quaternary phreatic ions were mainly controlled by leaching and mixing process, and some areas were significantly affected by evaporation. The ions of Quaternary confined water were mainly controlled by leaching and cation exchange. The ions of the Cretaceous confined water in the northern part of the plain were controlled by leaching and cation exchange. The main ions of groundwater in the study area came from the dissolution of halite, carbonates and gypsum.

    Conclusions

    Along the direction of groundwater flow, the concentration of ion components in Quaternary phreatic showed an increasing trend. In the Quaternary phreatic and confined water in the Ejina plain, the main water- rock interaction processes were dissolution of halite, dolomite and gypsum, precipitation of calcite, and positive cation exchange. In the interlaced zone between the desert and the plain in the southeast of the study area, the dissolution of halite, dolomite and gypsum, the precipitation of calcite, and reverse cation exchange mainly occurred. Halite, dolomite and gypsum dissolution, calcite precipitation, and positive cation exchange mainly occurred in the Cretaceous confined water in the northern plain.

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