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Studied waters belong to warm(T=30-50℃),alkaline(pH=8.9-9.3),low mineralized(TDS<235 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.
Studied waters belong to warm (T = 30-50 ° C), alkaline (pH = 8.9-9.3), low mineralized (TDS <235 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 / l), 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 proven by stable isotope values varying from -71 ‰ to -136.1 ‰ and -10.8 ‰ to-18.8 ‰ for δ ~ 2U and δ ~ (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 ° C respectively. Presence of deep faults both with abnormal thermal gradient (~ 45-50 K / km) define unique geochemical shape of thermal waters of Si khote-Alin, area, where no present volcanic activity is registered.