| 滇西洱源盆地高温热泉水文地球化学特征及其地质意义 |
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| 关键词:high-temperature hydrothermal spring hydrogeochemistry hydrogen and oxygen isotopes self-organizing map neural network Eryuan Basin |
| 基金项目:由深地国家科技重大专项项目(编号: 2024ZD1004103)、中国地质调查局地质调查项目(编号: DD20221677-2)和中国地质科学院 基本科研业务费项目(编号: JKY202406; JKYZD202401; JKYQN202307)联合资助。 |
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| 摘要: |
| Hydrogeochemical Characteristics and Geological Implications of High-temperature Geothermal Groundwater in the Eryuan Basin, Western Yunnan |
| The Eryuan Basin is rich in high-temperature geothermal resources; however, excessive fluoride ion content has seriously restricted the development and utilization of these resources. The aim of this study was to analyze the hydrogeochemical characteristics and genetic mechanisms of high-temperature geothermal groundwater in the Eryuan Basin. A total of 25 geothermal water samples were collected. Based on hydrogeochemical testing and isotope analysis, self-organizing map neural network clustering, hydrogeochemical graphical methods, and ion ratio analysis were combined in this study. The average temperature of geothermal groundwater in the Eryuan Basin is 73.25 ℃, with a pH of 6.20–8.20, TDS of 326–1 197 mg/L, and hydrochemical type of HCO3-Na. The hydrogeochemical characteristics of geothermal water are dominated by water–rock interactions influenced by the dissolution of silicate rocks and cation exchange interactions. Based on classification results from the self-organizing mapping neural network, the genetic mechanism of fluoride-enriched geothermal groundwater was analyzed. The fluoride ions were found to mainly originate from the dissolution of fluoride-rich minerals, and the enrichment process was closely related to pH, cation exchange interactions, and competitive adsorption interactions. The geothermal water is mainly recharged by atmospheric precipitation in the eastern mountainous areas, with a recharge elevation of 2 500–4 192 m and circulation depth of 2 625–5 286 m. The quartz geothermometer method was used to estimate the geothermal reservoir temperature to be 105–166 °C. This study revealed the hydrogeochemical characteristics and mechanisms of high-temperature and high-fluoride geothermal water in the Eryuan Basin, providing a theoretical basis for the efficient development and utilization of geothermal resources in the region. |
| ZHANG Shouchuan,LIU Kai,YANG Yang,ZHENG Shuhui,ZHANG Yaoyao,LIU Xiaohuang,WANG Luyao,WANG Jialiang,LIU Shurui.2026.Hydrogeochemical Characteristics and Geological Implications of High-temperature Geothermal Groundwater in the Eryuan Basin, Western Yunnan[J].Acta Geoscientica Sinica,47(1):91-104. |
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