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Stable Carbon Isotope Geochemical and Hydrochemical Features in the System of Carbonate–H 2 O–CO 2 and Their Implications—Evidence from Several Typical Karst Areas of China
Author(s) -
Zaihua Liu,
Daoxian Yuan,
Shiyi He
Publication year - 1997
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1997.tb00383.x
Subject(s) - karst , tufa , geology , geochemistry , isotopes of carbon , carbonate , calcite , ravine , carbon fibers , carbonate rock , stable isotope ratio , concretion , speleothem , deposition (geology) , earth science , geomorphology , total organic carbon , paleontology , sedimentary rock , cave , sediment , environmental chemistry , chemistry , archaeology , geography , materials science , composite material , quantum mechanics , physics , organic chemistry , composite number
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 CO 2 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 CO 2 provides the an active agent for karst processes; (2) the geothermal system, such as the Huanglong Ravine, in which metamorphic or/and juvenile CO 2 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.