| Stable Carbon Isotope Geochemical and Hydrochemical Features in the System of Carbonate-H_2O-CO_2 and Their Implications—Evidence from Several Typical Karst Areas of China |
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| 作者姓名： | Liu Zaihu Yuan Daoxian and He Shiyi Institute of Karst Geology Qixing Rd. Guilin Guangxi |
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| 作者单位： | Liu Zaihua，Yuan Daoxian and He Shiyi Institute of Karst Geology，40 Qixing Rd.，Guilin，Guangxi 541004 |
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| 基金项目： | This research was supproted by IGCP Project 379, National Natural Science Foundation of China (No. 49632100) and the Ministry of Geology and Mineral Resources of China (No. 9501104, Karst Dynamics Laboratory) |
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| 摘 要： | On the basis of hydrochemical observation and experimental calculation, the features of stable carbon isotope geochemistry in the karst dynamic systems of the Guilin Karst Experimental Site, Huanglong Ravine and Wujiangdu Dam Site are summarized in this study. Furthermore, an attempt has been made to solve several geochemical problems, such as the origin of CO2 in the system, kinetic fractionation of carbon isotopes during calcite deposition, hydrochemistry and formation of tufa, and carbon-14 dating of tufa of hydrothermal origin. The results show that three kinds of karst dynamic system can be distinguished: (1) the shallow system, such as the Guilin Karst Experimental Site, in which soil CO2 provides the an active agent for karst processes; (2) the geothermal system, such as the Huanglong Ravine, in which metamorphic or/ and juvenile CO, is the source of activity for karst; (3) the anthropogenic system, such as the Wujiangdu Dam Site, in which the stable carbon isotope geochemical and hydrochemical f
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Stable Carbon Isotope Geochemical and Hydrochemical Features in the System of Carbonate–H2O–CO2 and Their Implications—Evidence from Several Typical Karst Areas of China |
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| Authors: | Liu Zaihu Yuan Daoxian and He Shiyi Institute of Karst Geology Qixing Rd Guilin Guangxi |
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| Abstract: | On the basis of hydrochemical observation and experimental calculation, the features of stable carbon isotope geochemistry in the karst dynamic systems of the Guilin Karst Experimental Site, Huanglong Ravine and Wujiangdu Dam Site are summarized in this study. Furthermore, an attempt has been made to solve several geochemical problems, such as the origin of CO2 in the system, kinetic fractionation of carbon isotopes during calcite deposition, hydrochemistry and formation of tufa, and carbon-14 dating of tufa of hydrothermal origin. The results show that three kinds of karst dynamic system can be distinguished: (1) the shallow system, such as the Guilin Karst Experimental Site, in which soil CO2 provides the an active agent for karst processes; (2) the geothermal system, such as the Huanglong Ravine, in which metamorphic or/ and juvenile CO, is the source of activity for karst; (3) the anthropogenic system, such as the Wujiangdu Dam Site, in which the stable carbon isotope geochemical and hydrochemical features have been greatly affected by human activity. |
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| Keywords: | karst dynamic system stable carbon isotope geochemistry hydrochemistry tufa formation carbon source |
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