Hydrochemical and isotopic characteristics of the Hongtangsi hot spring in Fengning County of Hebei Province

The Hongtangsi hot spring in Fengning County of Hebei Province occurs in feldspar granite of the Fourth Epoch of the Yanshan Period.It is the discharge vent of thermal groundwater which receives recharge from precipitation and is heated when undergoing deep circulation.The hot water has TDS of less than 400mg / L with major cations of Na +,and anions of SO24-and HCO 3-.The hot spring is of SO4.HCO3—Na type and has high concentrations of F-,H2SiO3 and Rn of 17.5mg /L,75.7mg /L and 131.1 Bq /L,res...