Hydrochemistry of Geothermal Water in Tianshui and Its Northern-southern Area

  • College of Earth and Environmental Science, Center for Hydrologic Cycle and Water Resources in Arid Region, Lanzhou University, Lanzhou, Gansu 730000, China

Received date: 2010-09-04

  Revised date: 2010-12-08

  Online published: 2011-06-20


A geochemical study of geothermal water has been carried out in the Tianshui and its northern-southern area. Geothermal water of Wushan and Tianshui is bicarbonate water of low salinity characterized by pH in 7.94-9.06 and low total dissolved solids (TDS) (226-255 mg/L), which were probably formed by water-rock interaction between meteoric rain, biotite plagioclase gneiss rock and carbonate sediment in reservior. While geothermal water of Tongwei and Qingshui is sulfate water with characteristics of pH in 7.1-8.07 and high total dissolved solids (TDS) (915-1 793 mg/L), which may arised from water-rock interaction between meteoric rain, variscan granite and sinian amphogneiss. The isotopic data show that the origin of thermal water is meteoric water and not severely affected by water-rock isotope exchange. Assessments of various chemical geothermometer applied on the geothermal waters suggested the probable existence of a deep geothermal reservoir of middle-low enthalpy (70-111癈) in the Tianshui and its northern- southern area. The sustainable utilization of the thermal water will be maintained if the total withdrawal rate is relatively small, and an alternative pumping and non-pumping pattern is used in Tianshui and its northern-southern area with mean yearly rainfall of near 500 mm.

Cite this article

WEN Yu-hua, WANG Nai-ang, ZHU Xi-fen, ZHANG Hua-an, MA Hong-wei, CHEN Li . Hydrochemistry of Geothermal Water in Tianshui and Its Northern-southern Area[J]. SCIENTIA GEOGRAPHICA SINICA, 2011 , 31(6) : 668 -673 . DOI: 10.13249/j.cnki.sgs.2011.06.668


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