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在对吉兰泰盐湖南部地下水化学组分特征分析的基础上,利用PHREEQC软件对水文地球化学演化规律进行模拟研究。结果表明,从贺兰山西侧山前到吉兰泰盐湖,水化学类型由HCO-3型过渡到Cl-—SO24-型、最后变为Cl-型;Ca2+、Mg2+与SO24-相关分析表明发生石膏溶解出的Ca2+置换了MgCO3中Mg2+,从而产生了CaCO3沉淀的水岩反应,而白云石、石膏、岩盐、CO2(g)的溶解是常量离子增加的物质来源,同时伴有强烈的蒸发浓缩作用及阳离子交换作用。特别是深层地下水具有较高的mNa/Cl值与较低的mCa/Na值,表明发生强烈的阳离子交换作用,这对认识吉兰泰盐湖地区及干旱区沙漠地区水体发生的水岩相互作用与演化机制具有借鉴作用。
Based on the analysis of the characteristics of the groundwater chemical components in the southern part of the Jilantai Salt Lake, the hydrogeochemical evolution was simulated by using the software PHREEQC. The results show that the hydrochemical type changes from HCO - 3 to Cl - SO24 - type and finally to Cl - type from the piedmont on the west side of Mt. Helan to Jilantai Salt Lake. The correlation analysis between Ca2 +, Mg2 + and SO24 - Ca2 + dissolved in gypsum displaces Mg2 + in MgCO3, resulting in the water-rock reaction of CaCO3 precipitation. The dissolution of dolomite, gypsum, rock salt and CO2 (g) is the source of the constant ions and accompanied by strong evaporation and concentration Role and cation exchange. Especially, deep groundwater has high mNa / Cl value and low mCa / Na value, indicating strong cation exchange. This is of great significance to the understanding of water-rock interaction and water-rock interaction in the Jilantai Salt Lake and desert areas Evolutionary mechanism has reference.