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Title:: Hydrogeochemical Characteristics of Hot Springs in South Segment of the Xianshuihe Fault Zone

Author(s):: WANG Yiling; MU Wenqing; SHI Zheming; (China University of Geoscience,Beijing,Beijing 100083,China)

Keywords:: hot springs; hydrochemical characteristics; multivariable statistics; geothermal reservoir temperatures; Xianshuihe fault zone

摘要:: 以鲜水河断裂带南段(康定—摩西断裂带)出露的26个温泉的水化学组分为研究对象,通过多元统计分析和地热温标方法,探讨了研究区断裂带不同部位温泉的水化学特征及热储温度的差异。结果表明:①研究区不同区域的温泉可被分为4组,除B组为HCO₃-Na-K型水外,A,C,D组均为HCO₃-Na型水; ②对热储温度的计算结果表明,研究区中部的热储温度高于南北两侧,地热活动性的强弱与地震活动性之间在空间上存在一定的关联性。

Abstract:: Based on the multivariate statistical analysis of the hydrochemical characteristics of the 26 hot springs exposed in the Kangding-Moxi segment of the Xianshuihe fault zone and the calculation of the thermal reservoir temperatures,this paper discusses the hydrogeochemical characteristics of hot springs in the study area and their relationship with fault zones.The results show that the hot springs in different areas could be grouped into four groups.The B group is classified into HCO₃-Cl-Na type and the A,C,D groups is classified into HCO₃-Na type.The result of geothermal reservoir temperature shows that the geothermal reservoir temperature in the middle of the study area is higher than that in the north and south,which is consist with the seismic activities in this area.