Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (6): 1838-1852.doi: 10.13278/j.cnki.jjuese.20200064

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Chemical Characteristics and Genesis of Geothermal Fluid in Deep Metamorphic Rock Area: A Case of Hot Springs in Longchuan Basin, Western Yunnan

Zhang Qidao1,2, Liu Zhennan1, Yin Linhu1   

  1. 1. Kunming Comprehensive Natural Resources Survey Center, China Geological Survey, Kunming 650111, China;
    2. School of Earth Resources, China University of Geosciences, Wuhan 430074, China
  • Received:2020-05-06 Online:2021-11-26 Published:2021-11-24
  • Supported by:
    Supported by the Project of China Geological Survey (DD2016008120)

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Abstract: In order to study the genesis and evolution of geothermal fluids in deep metamorphic rocks, the geological, radiometric, magnetic, hydrogeological, and hydrographic geochemistry surveys were carried out, the hydrographic and isotopic characteristics of Chibachu hot spring were thoroughly analyzed, and the cause of formation and characteristics of the hot spring were studied. The results show that:The hydrochemical type of the hot spring is HCO3·SO4·CO3-Na, the content of Li+ in the hot spring is 0.220 mg/L, which reaches the naming standard of lithium mineral water; The F- content is 8.29 mg/L, which can be called fluorine water with medical value. The cold water mixing ratio in the hot spring water is 0.72, the recharge elevation of the hot water is 1 166.83 m, the temperature of the recharge area is 9.96℃, the thermal storage temperature is 191.71℃, the circulation depth is 2 082.29 m, and the natural heat release of the hot spring is 9.49×1012 J/a. The hot spring water comes from the atmospheric precipitation and is a deep-cycle rising spring. The genesis type of the groundwater hydro-chemical component is rock weathering, and its main component comes from water-rock interaction. The heat source is mainly the conduction heat of the deep uncooled magma and the tectonic heat produced by the active faults, and followed by the radiant heat produced by radionuclides in a small part of the rock mass. The pH, SO42-, Cl-, Na+, SiO2 and total alkalinity content of hot springs in the deep metamorphic rock area are higher than that of cold springs,but Ca2+ and Mg2+ contents are lower than that of cold springs. Currently, the hot spring is used only for bathing, and needs to be further developed and utilized.

Key words: hydro-geochemistry, Chibachu hot spring, Longchuan basin, western Yunnan Province, isotope, geophysics

CLC Number: 

  • P641.3
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