The Evolution and Instruction of Strontium Isotope in the Geothermal Water of Basin Type

Combined with the Guanzhong basin tectonic evolution, the data of Sr content, 87Sr/86Sr ratio and hot water hydrochemistry has been used to study the supply origin and flow path of deep geothermal water in the Guanzhong central region. The Sr isotope study result shows that when accepting recharge, the geothermal water in the northwest and southeast of Xianli terrace both mainly come from northwest direction. A small amount supply source of geothermal water in the Xi 'an city is from Qinling mountain and the principal supply source comes from the west and north direction, however, geothermal water of Chang’an accepts supply from the north of Qinling mountain. Keywords: geothermal water; strontium isotope; basin type; indicating significance