The Gas Hure Salt Lake(GHSL)in the northwestern Qaidam Basin,western China,is rich in boron(B)resources,but its B-resource origin is hardly known.Hydrochemical compositions and B isotope characteristics of different waters were collected around the GHSL,including the river water,stream water,spring water,salt-lake brine,intercrystalline brine,well water,drilling brine,and solar pond brine.The hydrochemical signatures suggest that silicates,carbonates and evaporates are the main B-bearing rocks during the water dynamic.The reservoir estimation of B resources shows that the Kulamulekesay River(KLMR)and the Atekan River(ATKR)contribute annually 18.3 tons and 22.84 tons of B,respectively,with a total amount of 11.72×104 tons of B during the past 5.7 ka.In comparison with the known B reservoir(32.96×104tons)in the GHSL,a significant amount of B in the GHSL was probably recharged from deep fluids and sediments around the GHSL.The B concentration and B-enrichment degree are shaped by the evaporation process,which are highly elevated at the carnallite and bischofite stages.