| 贵阳市岩溶地下水水化学演化机制:水化学和锶同位素证据 |
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| 引用本文： | 苏春利,张雅,马燕华,刘文波.贵阳市岩溶地下水水化学演化机制:水化学和锶同位素证据[J].地球科学,2019,44(9):2829-2838. |
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| 作者姓名： | 苏春利 张雅 马燕华 刘文波 |
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| 作者单位： | 1.中国地质大学环境学院, 湖北武汉 430074 |
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| 基金项目： | 贵州省公益性基础性地质工作项目黔国土资地环函[2014]23号 |
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| 摘 要： | 岩溶地下水的水化学特征及其水岩作用过程研究对岩溶地下水合理开发利用和污染防治具有重要意义.综合利用水化学分析、主要离子比值、锶含量和87Sr/86Sr比值分析和反向水文地球化学模拟，深入分析了贵阳市地下水和地表水不同季节的水化学特征变化和水文地球化学演化过程.水化学特征分析表明，贵阳市地下水以HCO3·SO4-Ca型和HCO3-Ca·Mg型为主，水化学组成在季节和空间分布上存在一定的规律性变化，地表水与地下水的直接混合对地下水化学组成有一定的影响.锶同位素比值和水文地球化学反向模拟表明，地下水水化学组分主要受岩石风化作用的控制，以方解石和白云石为主的碳酸盐的溶解－沉淀作用以及硫酸盐和岩盐的溶解是控制研究区地下水水化学特征的重要过程，并受上覆孔隙含水层硅酸盐矿物水解的影响.
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| 关 键 词： | 岩溶地下水 水-岩作用 锶同位素 反向水文地球化学模拟 贵阳市 水文地质 |
| 收稿时间： | 2019-06-29 |
Hydrochemical Evolution Processes of Karst Groundwater in Guiyang City: Evidences from Hydrochemistry and 87Sr/86Sr Ratios |
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| Abstract: | Study on hydrochemical characteristics and water-rock interaction is of great significance to ascertain the causes of groundwater pollution and the sustainable use of karst water. Hydrochemical components and types, ion ratios, strontium content, 87Sr/86Sr ratio and inverse hydrogeochemical modelling were employed to identify hydrochemical evolutional processes of karst groundwater in Guiyang City. The results show that the hydrochemical types of groundwater are mainly HCO3·SO4-Ca and HCO3-Ca·Mg, and the hydrochemical compositions of groundwater varied with time and space due to the dissolution/precipitation of different minerals. The mixing of surface water and groundwater has a certain influence on the hydrochemical characteristics of groundwater. Strontium isotope analysis and inverse hydrogeochemical modeling indicate that the hydrochemical characteristics of groundwater are mainly controlled by rock weathering. The dissolution-precipitation of carbonate dominated by calcite and dolomite as well as the dissolution of sulfate and halite are important processes to control the hydrochemical characteristics of groundwater in the study area, and are also affected by the hydrolysis of silicate minerals in the overlying porous aquifer. |
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