SOME MECHANISMS FOR HYDROCHEMICAL REACTION MODEL WITHIN HYDROGEOLOGY UNIT: AN EXAMPLE OF LU'AN MINE, XIN'AN SPRINGS
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摘要: 完整的水文地质单元内, 从补给区到排泄区, 矿物溶沉的顺序通常依次为方解石、白云石、石膏.这样, 水中的方解石饱和指数一般应大于白云石饱和指数, 但在辛安泉域潞安矿区8508~8516孔一带, 出现了白云石饱和指数明显大于方解石饱和指数的异常现象.就其形成机制, 建立了一套水化学类型形成的化学反应模型, 阐述了模型的存在条件, 并用氧化还原和离子交替等理论做了进一步的检验.结果表明, 所建模型符合实际情况.该模型在其他类似水文地质单元内也可得以验证, 因此具有一定的普遍意义Abstract: In an integrated hydrogeological unit, the mineral dissoution and precipitation occur usually in the following order: calcite, dolomite, gypsum from the recharge region to the outflow zone. Thus, the calcite saturation index in the water should often be greater than that of dolomite. However, the opposite case is present in 8508-8516 bore belt of the Lu'an mine, Xin'an springs where the saturation index of dolomite is distinctively greater than that of calcite. To explain this phenomenon, a set of hydrochemical reaction models are established in this paper and the corresponding existence conditions of these models are expounded. Furthermore, the model thus established is further tested with such theories as redox and ion alternation. Consequently, this model proves effective in the field work. Finally, this model may also prove effective in other similar hydrogeological units. Therefore, this model is universal to some extent.
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Key words:
- saturation index /
- hydrochemical reaction model /
- redox /
- ion alternation
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图 2 山西辛安泉域潞安矿区矿物溶沉及水化学类型分区
1.钻孔/井; 2.方解石饱和指数βc=1.0;3.白云石饱和指数βd=1.0;4.石膏饱和指数βg=1.0;5.白云石饱和指数/方解石饱和指数为0.95;6.水化学类型分区线; 7.重碳酸钙(钙镁) 型水; 8.重碳酸硫酸钙(钙镁) 型水; 9.硫酸碳酸钙镁(钙) 型水; 10.硫酸钙镁、硫酸氯化物钙镁型水; 11.正断层; 12.向斜轴
Fig. 2. Mineral dissolution, precipitation and hydrochemistry di-vision of Lu'an diggings, Xin'an springs, Shanxi Province
表 1 各代表点硫组分浓度氧化还原计算结果及实测pH值
Table 1. Calculated results of sulfides redox and analyzed pHin typical samples
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[1] 胡宽瑢, 曹玉清. 碳酸盐岩地区水质和化学动力学模型研究[J]. 水文地质工程地质, 1993, (3): 8~9. https://www.cnki.com.cn/Article/CJFDTOTAL-SWDG199303002.htm [2] 沈照理. 水文地球化学基础[M]. 北京: 地质出版社, 1986. 63~64. -
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