Hydrogeochemical zoning characteristics of the strontium mineral spring in Xintian county, Hunan Province
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摘要: 以湖南新田县大型富锶矿泉为研究对象，通过采样、水化学组分分析，运用ArcGIS、AquaChem软件揭示富锶地下水水化学组分、水化学类型及水平和垂向分带特征。结果表明：下降泉中锶元素含量具有很好的分带特征，但机井中锶的分带性较差，TDS与锶元素含量变化基本一致。下降泉、机井中离子的变异系数具有较好的一致性，Ca2+、HCO3 - 含量较为稳定，而Sr2+、Mg2+、Na+、SO4 2-、Cl-质量浓度变化较大，下降泉和机井的水动力环境均有较大变化，或含水岩组的差异性较明显。下降泉、机井中主要离子毫克当量数所占百分比排次相同，但其垂向变化范围较大，机井水化学组分受含水岩组和人类活动等因素影响较大，水化学类型也由下降泉单一的HCO3-Ca型水演变为HCO3-Ca型、HCO3-Ca·Mg型、HCO3-Na·Mg·Ca型等复杂水化学类型，表现出垂向上正向的地球化学分带特征。锶元素在垂向上的分带呈现出异常，在50~80 m深度达到最大值。Abstract: Migration and transformation of the strontium element in groundwater in karst hilly regions are affected by the groundwater agent, and its enrichment and zoning characteristics have important hydrogeochemical significance. This paper addresses these issues using an example of a large strontium-rich mineral spring in Hunan Xintian county. Sampling, water chemical composition analysis, and data processing by ArcGIS and AquaChem software permit to reveal the horizontal and vertical zoning characteristics as well as chemical composition and types of this spring. Results show that the strontium element content in the gravity springs has good zoning characteristics, while such characteristics in the motor-pumped wells are not obvious. TDS is basically consistent with the strontium content. The variation coefficients of ions have good consistence in the gravity spring and well. Ca2+ and HCO3 - content are relatively stable, while Sr2+, Mg2+, Na+, SO4 2-, and Cl-concentrations change greatly. The hydrodynamic environments of the springs and motor-pumped wells vary intensively, or the water-bearing rocks are obviously different. The main ion microgram equivalent number in the gravity springs and motor-pumped wells has the same percentage rank, but the vertical variation range is larger. The hydrochemistry components in the wells are primarily influenced by water-bearing rocks and human activities. The hydrochemical type also changes from the single type in the surface karst springs to the well’s complex hydrochemical type, showing the upward geochemical zoning in the vertical direction. The vertical zoning of strontium is abnormal and reaches the maximum at 50-80 m depth.
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