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Geochemical characteristics of geothermal fluid in Tengchong Area,Yunnan Province,China

LIU Hong1,2,Zhang Guo-ping1,JIN Zhi-sheng1,Liu Cong-qiang1,HAN Gui-lin1,LI Ling1,2 ( 1. State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 55002,China; 2. Graduate School of Chinese Academy of Sciences,Beijing 100039,China)  
The geochemical characteristics of the hot spring waters in the Rehai and Ruidian geothermal fields,Teng-chong County,Yunnan Province,China,were described and their possible environmental impact was assessed. The results show that the alkaline spring waters contain high levels of K,Na,F,Cl,and SiO2,whereas the only acidic spring water in Rehai geothermal field contains high levels of SO42-,Mn and Fe. As and Sb in the spring waters are in the ranges of 43. 6-687 μg/L and 0. 38-23. 8 μg/L,respectively. As( III) occurs in most spring waters,and the fraction of As( III) is up to 91% of total As. Fractions of geothermal As and Sb are trapped in the sinter deposits while most of them enter the environment. The diffusion of As and Sb into groundwater and downstreams in crop fields constitutes a threat to the health of the local population.
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