| 内蒙古土默川平原地下水水文地球化学特征及其成因 |
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| 关键词:groundwater hydrogeochemistry high-fluorine water high-arsenic water Tumochuan plain |
| 基金项目:国家自然科学基金项目(编号: 41562020) |
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| 摘要: |
| Hydrogeoehemical Characteristics and Genesis of Groundwater in the Tumochuan Plain of Inner Mongolia |
| Based on the hydrogeological investigation and sample collection and combined with the groundwater flow system, statistical analysis, Gibbs analysis, Piper diagram and correlation analysis, the authors investigated the hydrogeochemical characteristics of groundwater in the Tumochuan plain. The results show that the groundwater in this area is of weak alkalinity, and the groundwater chemistry is mainly of HCO3-Ca and Cl-Na type. The chemical composition of the unconfined water is mainly influenced by the water-rock interaction and the evaporation concentration. The chemical composition of the confined water is mainly controlled by the water-rock interaction. In 79 unconfined water samples, the saturation index of calcite and that of dolomite less than 0 are 1 and 5, respectively. In 56 confined water samples, the saturation index of calcite and that of dolomite less than 0 are both 20. The weakly alkaline environment of regional groundwater, high Na+ and low Ca2+ provide the conditions for the formation of high-fluorine water. Influenced by the evaporation and concentration, the high-fluorine unconfined water is mainly distributed in discharge area of groundwater in the east of Tuoketuo County. Influenced by the aquifer media, the high-fluorine confined water is mainly distributed in the lacustrine platform. The strongly reducing environment of local groundwater together with Fe, Mn oxides and hydroxides of the reductive dissolution as well as competitive adsorption of HCO– 3 is an important reason for the enrichment of arsenic in this area. Influenced by sediments in Hasu Lake, the high-arsenic unconfined water is mainly distributed in Hasu Lake and Gaoquanying. Under the control of Fe oxides and hydroxides of the reductive dissolution and groundwater flow conditions, the high-arsenic confined water is mainly distributed along the bank of Dahei River in the middle of the plain. |
| LIU Xiao-bo,DONG Shao-gang,LIU Bai-wei,FENG Hai-bo,LI Zheng-kui,LIU Li-wei.2017.Hydrogeoehemical Characteristics and Genesis of Groundwater in the Tumochuan Plain of Inner Mongolia[J].Acta Geoscientica Sinica,38(6):919-929. |
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