Hydrothermal He and CO2 at Wudalianchi intra-plate volcano,NE China |
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| Institution: | 1. UFZ Helmholtz Centre for Environmental Research, Halle, Germany;2. Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, Germany;3. GFZ German Research Centre for Geosciences, Helmholtz Centre Potsdam, Germany;4. Geological Survey of Slovenia, Ljubljana, Slovenia;1. UFZ-Helmholtz Centre for Environmental Research, Germany;2. GFZ German Research Centre for Geosciences, Germany;1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;3. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Chemical and isotopic compositions have been measured for CO2-rich bubbling gases discharging from cold springs in Wudalianchi intra-plate volcanic area, NE China. Observed 3He/4He ratios (2–3 RA) and δ13C values of CO2 (?5‰ to ?3‰) indicate the occurrence of a mantle component released and transferred to the surface by the Cenozoic extension-related magmatic activities. The CO2/3He ratios are in wide range of (0.4–97 × 109). Based on the apparent mixing trend in a 3He/4He and δ13C of CO2 diagram from all published data, the extracted magmatic end-member in the Wudalianchi Volcano has 3He/4He, δ13C and CO2/3He value of ～3.2 RA, ～?4.6‰ and ～6 × 1010, respectively. These values suggest that the volatiles originate from the sub-continental lithospheric mantle (SCLM) in NE China and represent ancient fluids captured by prior metasomatic events, as revealed by geothermal He and CO2 from the adjacent Changbaishan volcanic area. |
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