Geochemical features of the geothermal CO2-watercarbonate rock system and analysis on its CO2 sources |
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| Authors: | Zaihua Liu Daoxian Yuan Shiyi He Meiliang Zhang and Jiagui Zhang |
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| Institution: | (1) Institute of Karst Geology, Ministry of Land and Resources, 541004 Guilin, China;(2) Institute of Environmental Geology, Ministry of Land and Resources, 100081 Beijing, China |
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| Abstract: | Taking Huanglong Ravine and Kangding, Sichuan, and Xiage, Zhongdian, Yunnan, as examples, the authors summarize the hydrogeochemical
and carbon stable isotopic features of the geothermal CO2-water-carbonate rock system and analyze the CO2 sources of the system. It was found that the hydrogeochemical and carbon stable isotopic features of such a system are different
from those of shallow CO2-water-carbonate rock system, which is strongly influenced by biosphere. The former has higher CO2 partial pressure, and is rich in heavy carbon stable isotope. In addition, such a geothermal system is also different from
that developed in igneous rock. The water in the latter system lacks Ca2+, and thus, there are few tufa deposits on ground surface, but it is rich in light carbon stable isotope. Further analysis
shows that CO2 of the geothermal CO2-water-carbonate rock system is a mixture of metamorphic CO2 and magmatic CO2. |
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| Keywords: | geothermal CO2-water-carbonate rock system hydrogeochemistry carbon stable isotope CO2 sources |
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