Gensis of geothermal water in the Da Qaidam area,northern margin of the Qaidam Basin:Constraints from hydrochemistry and isotopes of hydrogen-oxygen-strontium
In order to explore the hydrochemical characteristics and genetic model of the geothermal field in Da Qaidam,the northern margin of the Qaidam basin,14 groups of groundwater sample of this area were analyzed for hydrochemical components and isotopes(δD,δ18O,87Sr/86Sr,3H)in this study.The results show that the outlet temperature of underground hot water in Da Qaidam is 52～74℃,and the total dissolved solids(TDS)content is 959.8～1451.3 mg/L.The hydrochemical types of the groundwater are all the Cl-Na type,and according to the ion correlation and 87Sr/86Sr value,the main solutes of groundwater in the area originate from the dissolution of evaporites and silicate minerals.Stable isotopes of hydrogen and oxygen show that atmospheric precipitation is the main source of groundwater recharge and part of the groundwater is recharged by magma water,and the estimated recharge elevation is 3591～4374 m.XSWQ-06 and XSWQ-07 have significant oxygen drift,mainly due to evaporation and enhanced water-rock reaction.Based on the SiO2 geothermal temperature scale,the multi-mineral equilibrium method and the silicon enthalpy model,the thermal storage temperature of underground hot water in the area is estimated to be 171～227℃,and the circulation depth is estimated to be 4.7～6.9 km.The geothermal resources in this area have great potential for development and utilization.
NETL
NSTL
万方数据
维普
