Stable isotope and aquatic geochemistry of a typical subtropical karst subterranean stream in southwest China
- Permanent Link:
- Stable isotope and aquatic geochemistry of a typical subtropical karst subterranean stream in southwest China
- Series Title:
- Carbonates and Evaporites
- Zhang, Tao
- Publication Date:
- Subjects / Keywords:
- Hydrogeochemistry ( local )
Stable Isotopes ( local )
Carbonate Dissolution ( local )
Dic ( local )
Subterranean Karst Stream ( local )
- serial ( sobekcm )
- A hydrogeochemical and isotopic study was conducted on the subterranean karst stream, namely the Guancun subterranean stream (GSS). The hydrogeochemical processes of the GSS were controlled through calcite dissolution and precipitation and were driven by the concentration of CO2, which controlled changes in the pH and of PCO2 in the water. The Î´18O and Î´D values of the GSS were within the global meteoric water line and the local meteoric water line, thereby indicating that the water of the GSS comes from precipitation. Certain abnormal Î´18O and Î´D values suggest the effect of evaporation on the GSS given its use in a particular irrigation system, wherein the GSS in transformed into a surface stream and flows for a relatively long time on the surface during the wet season. The Î´13CDIC values of the GSS range from âˆ’13.5 to âˆ’11.3â€° in the dry season and from âˆ’13.9 to âˆ’9.5â€° in the wet season, thereby indicating that the GSS belongs to a semi-open system. The Î´13CDIC values in the GSS were formed by the Î´13CDIC values of the soil CO2 and carbonate dissolution at different proportions. According to the simplified mass balance formula, the contributions of carbonate dissolution to the dissolved inorganic carbon (DIC) of the GSS were calculated to be 50.2â€“58.3% and 48.7â€“64.7% in the dry and wet seasons, respectively, thereby indicating a less than 50% carbonate dissolution contribution during the formation of DIC in karst groundwater. Moreover, sulfuric acid and nitric acid were observed to participate in karst processes.
- Original Version:
- Carbonates and Evaporites, Vol. 33, no. 3 (2017-05-16).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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