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| 基于水化学与氯、锶同位素揭示矿区地下水水岩相互作用 |
| Study on the Interaction between Groundwater and Rock in Mining Areas Based on Hydrochemistry and Chlorine and Strontium Isotopes |
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| DOI： |
| 中文关键词: 氯同位素 锶同位素 水化学特征 水岩作用 矿区地下水 |
| 英文关键词: Chlorine isotopes Strontium isotopes Hydrochemical characteristics Water rock interaction Groundwater of mining area |
| 基金项目:国家自然科学基金资助项目（No.42072201）；安徽省自然科学基金资助项目（No.1608085QD79）；中煤新集科技攻关基金资助项目（ZMXJ-FY-JS-2022-17） |
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| 摘要点击次数: 20 |
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| 中文摘要: |
| 以淮南矿区口孜东矿为研究对象，系统采集25组地下水样品，通过水化学特征分析，Cl、Sr同位素示踪及piper三线图解析等方法揭示地下水水岩作用机理及盐分演化规律。结果表明：砂岩水、混合水与太灰水分别呈Cl Na型、过渡型与HCO3 Na型特征，总溶解固体（TDS）均值达1 582 mg/L，水化学环境复杂；δ37Cl值为-041‰～058‰，同位素分馏特征表明浅层地下水补给、硅酸盐矿物（如钠长石）溶解〖JP2〗及蒸发浓缩是控制盐渍化的关键过程；87Sr/86Sr值（0709 55~0712 16）〖JP〗与Sr2+ Ca2+/Na+值协同演化揭示Sr主要来源于碳酸盐岩（方解石、白云石）溶蚀及硅酸盐岩（钾长石、伊利石）风化作用。 |
| 英文摘要: |
| Taking Kouzidong Mine in Huainan mining area as the research object， 25 groups of groundwater samples were collected. The mechanism of water rock interaction and the law of salt evolution in groundwater were studied by hydrochemical characteristic analysis， Chlorine and Strontium isotope tracing and piper trigram analysis. The results indicated that sandstone water， mixed water and Taihui water were Cl Na type， transitional type and HCO3 Na type， respectively. The mean total dissolved solids（TDS） was 1 582 mg/L. The hydrochemical environment was complex. δ37Cl ranged from -041‰ to 058‰. The characteristics of isotope fractionation indicated that shallow groundwater recharge， dissolution and evaporation concentration of silicate minerals（such as albite） were the key factors to control salinization. The co evolution of 87Sr/86Sr ratio（0709 55~0712 20） and Sr2+ Ca2+/Na+ ratio showed that Sr mainly originated from the dissolution of carbonate rocks（calcite and dolomite） and the weathering of silicate rocks（K feldspar and illite）. |
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