| Geochemistry of Thermal Waters of Continental Margin of Far East of Russia |
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| 作者姓名： | Ivan V. BRAGIN Georgy A. CHELNOKOV Oleg V. CHUDAEV Natalia A. KHARITONOVA Sergey V. VYSOTSKIY |
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| 作者单位： | 1 Far East Geological Institute, Russian Academy of Sciences, Vladivostok, 690022 Russia;2 Moscow State University, Moscow, 119991 Russia;3 Far East Federal University, Vladivostok, 690922 Russia |
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| 基金项目： | We would like to thank analytical center of FEB RAS for providing analyses, especially Elovskiy E.V. andEkimova N.I. This study was supported by RSCF project 14–17–00415. |
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| 摘 要： | Studied waters belong to warm(T=30-50℃),alkaline(pH=8.9-9.3),low mineralized(TDS235 mg/1)Na-HCO_3 or Na-SO_4-HCO_3 thermal waters with high content of SiO_2(up to 81 mg/l)and F(up to 3.9 mg/1),occur on modern volcano-tectonic rejuvenated areas of Eastern Sikhote-Alin orogenic belt.Low~3He concentration as well as N_2/O_2 and N_2/Ar ratios exclude influence of deep mantle fluid.New rare earth element data constrain our understandmg of water-rock interaction occurring in the water source region.Meteoric origin of waters is proved by stable isotope values varying from-71‰to-136.1‰and from-10.8‰to-18.8‰forδ~2U andδ~(18)O respectively.REE patterns reflect high pH,resultfing from water-rock interaction and oxidative conditions.Calculations of deep aquifer temperature using Na-K and quartz geothermometers show 116.8-131.1°C and 82.2-125.8℃respectively.Presence of deep faults both with abnormal thermal gradient(~45-50 K/km)define unique geochemical shape of thermal waters of Sikhote-Alin,area,where no present volcanic activity is registered.
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| 关 键 词： | thermal waters water–rock interaction stable water isotopes rare earth elements in thermal waters |
| 收稿时间： | 2014/12/22 0:00:00 |
| 修稿时间： | 2015/5/20 0:00:00 |
Geochemistry of Thermal Waters of Continental Margin of Far East of Russia |
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| Authors: | Ivan V BRAGIN Georgy A CHELNOKOV Oleg V CHUDAEV Natalia A KHARITONOVA and Sergey V VYSOTSKIY |
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| Institution: | 1 Far East Geological Institute, Russian Academy of Sciences, Vladivostok, 690022 Russia;,2 Far East Geological Institute, Russian Academy of Sciences, Vladivostok, 690022 Russia;,3 Far East Geological Institute, Russian Academy of Sciences, Vladivostok, 690022 Russia;,1 Far East Geological Institute, Russian Academy of Sciences, Vladivostok, 690022 Russia; 2 Moscow State University, Moscow, 119991 Russia and 1 Far East Geological Institute, Russian Academy of Sciences, Vladivostok, 690022 Russia; 3 Far East Federal University, Vladivostok, 690922 Russia |
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| Abstract: | Studied waters belong to warm (T=30–50°C), alkaline (pH=8.9–9.3), low mineralized (TDS<235 mg/l) Na–HCO3 or Na–SO4–HCO3 thermal waters with high content of SiO2 (up to 81 mg/l) and F (up to 3.9 mg/l), occur on modern volcano–tectonic rejuvenated areas of Eastern Sikhote–Alin orogenic belt. Low 3He concentration as well as N2/O2 and N2/Ar ratios exclude influence of deep mantle fluid. New rare earth element data constrain our understanding of water–rock interaction occurring in the water source region. Meteoric origin of waters is proved by stable isotope values varying from ?71‰ to ?136.1‰ and from ?10.8‰ to ?18.8‰ for δ2H and δ18O respectively. REE patterns reflect high pH, resultfing from water–rock interaction and oxidative conditions. Calculations of deep aquifer temperature using Na–K and quartz geothermometers show 116.8–131.1° C and 82.2–125.8°C respectively. Presence of deep faults both with abnormal thermal gradient (～45–50 K/km) define unique geochemical shape of thermal waters of Sikhote–Alin, area, where no present volcanic activity is registered. |
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| Keywords: | thermal waters water–rock interaction stable water isotopes rare earth elements in thermal waters |
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