Hydrogeochemical and Isotopic Characteristics of the Hot Springs in the Litang Fault Zone, Southeast Qinghai–Tibet Plateau

Based on the observation of geochemical characteristics 19 hot springs in Litang Fault Zone (LFZ) from 2010 to 2019, major elements, trace and stable isotopes were investigated, a conceptual model ground fluid circulation LFZ was established. The main hydrochemical type spring water samples is HCO3−-Na+. δ2H values range −157.6‰ −123.4‰ δ18O −24.5‰ −15.4‰. fault zone mainly recharged by infiltrating precipitation, with recharge elevation 4062~6018 m. Hydrochemical types are controlled groundwater deep system, related rock lithology thermal reservoir water–rock reaction areas. Hot attribute three different heat sources, belonging geothermal systems. flow direction roughly northwest southeast along fault. deeper depth fault, higher temperature stronger seismic activity segment, which closely increase pore pressure, weakening, upwelling. This study helpful for further regional hydrogeological environments provides scientific basis revealing movement zones.