| Professional Committee of Rock and Mineral Testing Technology of the Geological Society of China, National Geological Experiment and Testing Center | Host |
| Citation: |
ZHANG Shouchuan, LIU Kai, WANG Luyao, ZHU Wei, DENG Yuefei, YU Chenghua. Identifying the Hydrochemical Characteristics and Genetic Mechanism of Medium-Low Temperature Fluoride-Enriched Geothermal Groundwater in the Hongjiang—Qianshan Fault of Jiangxi Province[J]. Rock and Mineral Analysis, 2024, 43(4): 568-581. doi: 10.15898/j.ykcs.202403030028
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Identifying the Hydrochemical Characteristics and Genetic Mechanism of Medium-Low Temperature Fluoride-Enriched Geothermal Groundwater in the Hongjiang—Qianshan Fault of Jiangxi Province
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Abstract
The Hongjiang—Qianshan fault has abundant medium-low temperature geothermal resources. However, the excessive fluorine concentration in geothermal groundwater restricts the development and utilization of geothermal resources. 20 samples were collected in this region for identifying the genetic mechanism of medium-low temperature of fluoride-enriched geothermal resources. The hydrochemical results indicate that the hydrochemical characteristic of high fluoride geothermal groundwater is HCO3-Na. The groundwater environment is alkaline and weakly alkaline. The fluoride concentration in geothermal groundwater is 2−12 times greater than the upper limited value, while those in the surface water and shallow groundwater are within the permittable threshold range. The isotopic results reveal that the recharge elevations and circulation depth are 797−2186m and 893−1893m, respectively. Quartz provides the most reliable estimations of reservoir temperatures, ranging from 79.4℃ to 113.1℃. The fluoride in geothermal groundwater originates from the rock weathering and mineral dissolution. Cation exchange and alkaline condition are the main influence factors for fluorine enrichment. The BRIEF REPORT is available for this paper at
http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.yk202403030028 .-
Keywords:
- fluoride /
- medium-low temperature geothermal water /
- hydrochemistry /
- isotope /
- Jiangxi Province
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References
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ZHANG Shouchuan, LIU Kai, WANG Luyao, ZHU Wei, DENG Yuefei, YU Chenghua. Identifying the Hydrochemical Characteristics and Genetic Mechanism of Medium-Low Temperature Fluoride-Enriched Geothermal Groundwater in the Hongjiang—Qianshan Fault of Jiangxi Province[J]. Rock and Mineral Analysis, 2024, 43(4): 568-581. doi: 10.15898/j.ykcs.202403030028
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Figure 1.
The distribution of sampling sites in the Hongjiang—Qianshan Fault
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Figure 2.
The Piper diagrams of different samples collected from the Hongjiang—Qianshan Fault.
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Figure 3.
(a) The relationship between δ2H and δ18O in different samples; (b) The relationship between Ca2+/Na+ and HCO3−/Na+ in geothermal groundwater samples
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Figure 4.
The ionic relationship in geothermal groundwater in the study area: (a) Na-K-Mg; (b) log(K2/Mg)-log(SiO2)
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Figure 5.
(a) The saturation index (SI) vs total dissolved solids (TDS) of geothermal groundwater; (b) The diagram of pH and F− concentration in geothermal samples.
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Figure 6.
The Gibbs diagrams of different samples: (a) Relationship between Na+/(Na++Ca2+) and TDS; (b) Relationship between Cl−/(Cl−+HCO3 − ) and TDS
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Figure 7.
(a) Relationship between hydrochemical paremeters in geothermal groundwater of Na+/Ca2+ vs F− concentration; (b) The diagram of CAI 1 vs CAI 2.
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Figure E.1.
(a) The relationship between δ2H and δ18O in different samples; (b) The Gibbs diagram of different samples; (c) The saturation index (SI) vs total dissolved solids (TDS) of geothermal groundwater; (d) The diagram of CAI 2 vs CAI 1.