Geochemistry of the Rehai and Ruidian geothermal waters, Yunnan Province, China

The geochemical characteristics of the hot spring waters in the Rehai and Ruidian geothermal fields, Tengchong County, Yunnan Province, China, are described and their possible environmental impact assessed. The results show that the alkaline spring waters contain high levels of K, Na, F, Cl, SiO sub...

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Bibliographic Details
Published in:Geothermics 2008-02, Vol.37 (1), p.73-83
Main Authors: GUOPING ZHANG, LIU, Cong-Qiang, HONG LIU, ZHISHENG JIN, GUILIN HAN, LING LI
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Geochemistry
Geothermics
Mineralogy
Silicates
Water geochemistry
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Summary:The geochemical characteristics of the hot spring waters in the Rehai and Ruidian geothermal fields, Tengchong County, Yunnan Province, China, are described and their possible environmental impact assessed. The results show that the alkaline spring waters contain high levels of K, Na, F, Cl, SiO sub(2), whereas the only acidic spring water in Rehai geothermal field contains high levels of SO sub(4) super(2-), Mn and Fe. As and Sb in the spring waters are in the range 43.6-687 mu g/L and 0.38-23.8 mu g/L, respectively. As(III) occurs in most spring waters, and constitutes up to 91% of the total As. A fraction of the geothermal As and Sb is trapped in the sinter deposits while most enters the environment. The diffusion of As and Sb into groundwater and downstream crop fields constitutes a threat to the health of the local population.
ISSN:0375-6505
1879-3576
DOI:10.1016/j.geothermics.2007.09.002