| 漆海龙,陈建一,张安福,魏世博,鲁得方.甘肃省董志塬黄土潜水锶富集特征及其形成机制[J].甘肃地质,2025,34(4):46-55 |
| 甘肃省董志塬黄土潜水锶富集特征及其形成机制 |
| STRONTIUM ENRICHMENT CHARACTERISTICS AND FORMATION MECHANISM OF LOESS GROUNDWATER IN DONGZHIYUAN, GANSU PROVINCE |
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| DOI： |
| 中文关键词: 锶 水化学 离子相关性 反向水文地球化学模拟 董志塬 |
| 英文关键词:strontium hydrogeochemistry of mineral water reverse hydrogeochemical Dongzhiyuan Gansu Province |
| 基金项目:甘肃省基础地质调查项目“甘肃省董志塬天然矿泉水成因及循环机理研究项目”（甘资勘函［2023］53 号）。 |
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| 中文摘要: |
| 董志塬地处甘肃省庆阳市中南部，是我国最大的黄土塬，也是我国重要的能源化工基地，其中赋存有较为丰富的黄土潜水，黄土潜水是董志塬区工农业生产、农村人畜用水的主要水源。 本文综合利用水化学图解、相关性分析、水文地球化学反向模拟等方法，分析了董志塬地区黄土潜水中锶含量分布特征，查明了水化学类型及成因，探讨了富锶地下水的形成机制，定量解析了黄土潜水自塬中心径流至塬边过程中发生的水—岩相互作用。 研究结果表明黄土潜水水化学类型简单，以HCO3-Ca·Mg型水为主，水中锶的含量介于0. 2 ~ 0. 905 mg ／ L，平均值0. 616 mg ／ L。 黄土潜水水化学的演化主要是受到岩石风化溶滤作用的控制和人类活动影响，通过溶滤作用获得的化学组分主要是来源于碳酸盐岩和硅酸盐岩的淋滤溶解。黄土塬区中心地带潜水中锶含量低，塬边地带潜水中锶含量普遍高。黄土潜水自塬中心地带至塬边径流路径发生了方解石、菱锶矿、石膏、钾长石溶解，白云石沉淀和Na+被解吸Ca2+被吸附。黄土潜水锶浓度表现出沿地下水径流方向富集的规律，水—岩相互作用时间越久，地下水中锶含量越高。菱锶矿的溶解是黄土潜水中锶离子的主要来源。 |
| 英文摘要: |
| Abstract：Dongzhiyuan is located in the central and southern part of Qingyang City, Gansu Province. It is the largest loess plateau in China and an important energy and chemical base. It is rich in loess groundwater, which is the main water source for industrial and agricultural production, rural human and animal water use in Dongzhiyuan area. This article comprehensively uses methods such as hydrochemical diagrams, correlation analysis, and hydrogeochemical reverse simulation to analyze the distribution characteristics of strontium content in loess groundwater in Dongzhiyuan area, identify hydrochemical types and causes, explore the formation mechanism of strontium rich groundwater, and quantitatively analyze the water rock interaction that occurs during the runoff of loess groundwater from the center of the plateau to the edge of the plateau. The hydrochemical types of loess groundwater are simple, mainly HCO3-Ca·Mg type water, with strontium content ranging from 0. 2 mg ／ L to 0. 905 mg ／ L, with an average of 0. 616 mg ／ L. The evolution of groundwater chemistry in loess is mainly controlled by rock weathering and leaching, and influenced by human activities. The chemical components obtained through leaching mainly come from the leaching and dissolution of carbonate and silicate rocks. The strontium content in the groundwater in the central area of the Loess Plateau is low, while the strontium content in the groundwater in the edge area is generally high. The runoff path of loess groundwater from the central area of the plateau to the edge of the plateau has undergone dissolution of calcite, strontium minerals, gypsum, and potassium feldspar, precipitation of dolomite, and desorption of Na + and adsorption of Ca2 + . The strontium concentration in loess groundwater exhibits a pattern of enrichment along the groundwater flow path. The longer the water-rock interaction time, the higher the strontium content in groundwater. The dissolution of strontianite is the main source of strontium ions in loess groundwater. |
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