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本文以重庆市温塘峡背斜和滇东小江断裂带出露温泉为例,探讨了其水文地球化学特征的差异。研究发现,由于地质背景条件基本相同,温塘峡背斜出露的温泉水文地球化学特征比较接近,水化学类型为SO4-Ca(Mg)型,而小江断裂带温泉水文地球化学特征差异较大,泉水水化学类型主要有HCO3-Na型(YN1)、HCO3-Ca型(YN2)、SO4-Ca(Mg)型(YN3和YN5)和SO4-HCO3-Ca-Na型(YN4),这与各泉点所处地质背景条件不同有很大关系。此外,通过对Na-K-Mg和Na-K-Mg-Ca图解模型的解读得出,所有样品均未达到水-岩平衡,仅有YN1泉点样品接近完全平衡线,表明YN1接近水-岩作用平衡状态,并由上述图解模型估算得到YN1点热储温度大概为100~120℃,与运用SiO2温标计算的热储温度(133~139℃)相差不大。此外,水化学特征和Na-K-Mg-Ca图解分析也表明,YN2与温塘峡背斜温泉水-岩作用过程比较相似。
Taking the Wentangxia anticline in Chongqing and the outcropping of Xiaojiang fault zone in eastern Yunnan as an example, the differences of hydrogeochemical characteristics are discussed. The study found that, due to the same geological background conditions, the hydrogeochemical characteristics of the hot springs exposed by the anticline of the Wentangxia gorge are close to each other, the hydrochemical type is SO4-Ca (Mg), and the hydrogeochemical characteristics of the hot springs in the Xiaojiang fault zone are quite different (YN1), HCO3-Ca type (YN2), SO4-Ca (Mg) type (YN3 and YN5) and SO4-HCO3-Ca-Na type (YN4) Each spring point where the geological background of different conditions have a great relationship. In addition, all the samples did not reach the water-rock balance through the interpretation of the Na-K-Mg and Na-K-Mg-Ca graphical models, and only the YN1 spring point sample was close to the complete equilibrium line, indicating that YN1 approached the water- Rock equilibrium state is estimated. The YN1 point thermal storage temperature is about 100 ~ 120 ℃, which is similar to the thermal storage temperature (133 ~ 139 ℃) calculated by using SiO2 temperature scale. In addition, hydrochemical characteristics and Na-K-Mg-Ca graphical analysis also show that YN2 is similar to the Wentangxia anticline spring water-rock interaction.