The provenance and evolution of thermal spring waters from the Dogai Coring area of Qiangtang basin in Tibet, China

•A series of Na-Cl type modern spring waters are present in the Dogai Coring area of north Qiangtang Depression, Tibetan Plateau, which are rich in K+ and Ca2+ but deficient in Mg2+ and Br.•High Cl/Br ratios of spring waters indicate that Cl and Na are mainly derived from dissolution of evaporite in marine strata.•The solutes in spring water are derived from dissolved Jurassic evaporites (e.g., halite, gypsum, and sylvine).•The 2nd member of Xiali formation is most likely the source horizon of evaporites.•The spring recharge is derived from meteoric water.