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Volume 34 Issue 3
Jun.  2015
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Article Navigation >  CARSOLOGICA SINICA  > 2015  >  34(3): 201-208
WANG Zun-bo, SHEN Li-cheng, LIANG Zuo-bing, JIANG Ze-li, LIAO Yu. Characteristics of hydrochemical compositions and stable carbon isotope of natural water in the Daggyia geothermal field, Tibet, China[J]. CARSOLOGICA SINICA, 2015, 34(3): 201-208. doi: 10.11932/karst20150301
Citation: WANG Zun-bo, SHEN Li-cheng, LIANG Zuo-bing, JIANG Ze-li, LIAO Yu. Characteristics of hydrochemical compositions and stable carbon isotope of natural water in the Daggyia geothermal field, Tibet, China[J]. CARSOLOGICA SINICA, 2015, 34(3): 201-208. doi: 10.11932/karst20150301
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Characteristics of hydrochemical compositions and stable carbon isotope of natural water in the Daggyia geothermal field, Tibet, China

doi: 10.11932/karst20150301

  • School of Geographical Sciences, Southwest University/ Key Laboratory of Eco-Environments in Three Gorges Reservoir, Ministry of Education

  • Publish Date: 2015-06-25
    Abstract
  • The objective of this work is to investigate the hydrochemical compositions of the geothermal water, lake water, river water, and ice- and snow-melt water as well as control factors of provenance in the Daggyia geothermal field of Tibet. The field surveys and sampling were conducted in August 2014. The main cations and anions of samples were measured using the ICP-OES and UV-visible spectrophotometer. The isotopic ratios of dissolved inorganic carbon (DIC) were analyzed using a gas stable isotope ratio mass spectrometer. The results show that the concentrations of total dissolved solids (TDS) range from 977.13 mg/L to 1 279.50 mg/L for geothermal water, and K+and Na+are the main cations, and HCO3-and Cl-are the main anions. The concentrations of TDS of the lake waters range from 77.81 mg/L to 810.94 mg/L, Ca2+, Na+, HCO3-(CO32-)andSO42-occupy the majority of ions. The hydrochemical types of both geothermal water and lake water are the type of bicarbonate-sodium. The ion concentrations of river and melt water are low, and the hydrochemical type is bicarbonate-calcium. The concentrations of DIC in geothermal water range from 9.2 mmol/L to 15.4 mmol/L, and that of δ13CDIC ranges from -9.09‰ to -0.95‰. The concentrations of DIC in lake water are 1.1 mmol/L to 9.7 mmol/L, the δ13CDIC values are -8.84‰ to -0.27‰. The Gibbs boomerang envelope of water samples indicates that the hydrochemical characteristics are mainly controlled by silicate rocks weathering in the area, and the major processes are the albite and potash feldspar weathering, while the hydrochemical compositions of geothermal water are also affected by dissolution of evaporation of salt rocks. The carbon sources of silicate weathering around the lakes are mainly soil carbon dioxide. Meanwhile the deep carbon dioxide input is the main source of silicate hydrolysis in hot spring areas. 

     

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