Hydrochemistry and noble gas geochemistry of geothermal waters in Chungcheong Province, South Korea

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  • Park Jisun
    Geochemical Research Center, Graduate School of Science, The University of Tokyo
  • Jeong Chan Ho
    Department of Geotechnical Disaster and Prevention Engineering, Daejeon University
  • Nagao Keisuke
    Geochemical Research Center, Graduate School of Science, The University of Tokyo Korea Polar Research Institute
  • Yang Jae Ha
    Soil and Groundwater Research Division, National Institute of Environmental Research
  • Sumino Hirochika
    Geochemical Research Center, Graduate School of Science, The University of Tokyo
  • Kim Kyu Han
    Korea Institute of Geoscience and Mineral Resources (KIGAM)
  • Kim Moon Su
    Soil and Groundwater Research Division, National Institute of Environmental Research
  • Lee Jong Ik
    Korea Polar Research Institute
  • Park Chung Hwa
    Department of Geotechnical Disaster and Prevention Engineering, Daejeon University
  • Koh Young Kwon
    Korea Atomic Energy Research Institute
  • Hur Soon Do
    Korea Polar Research Institute

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Fifteen water and gas samples from hot spring sites in Chungcheong Province, South Korea, were analyzed to determine their chemical compositions and noble gas isotopic ratios. These hot spring water samples were grouped into three chemical types: Ca-HCO3, Ca(Na)-HCO3, and Na-HCO3. The wide range of 3He/4He ratios in the hot spring waters (0.036–1.76 × 10–6; R/Ra = 0.026–1.26) indicates that the He originates from both mantle and crustal sources in the forms of 3He and 4He, respectively, with 4He dominating. The 4He/20Ne isotopic ratios and the concentrations of mantle-derived 3He suggest that geothermal waters originate from a common, deep-seated source containing mantle-derived and crustal He that mixes with shallow groundwater containing atmospheric noble gases as it rises to the surface.

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