Mercury concentration and isotope data of fumarole gas and hot spring water in Rehai and Dagejia geothermal foelds

This dataset presents mercury concentrations and isotopic compositions in fumarole gases and hot spring water samples from two geothermal fields in China (Rehai and Dagejia), and the temperature and pH value of hot spring water were also measured.Device photographs show mercury isotope enrichment processes in water and vent gases, and precipitation collection processes.