地球学报2026，Vol.47Issue(1)：91-104,14.DOI:10.3975/cagsb.2025.121611
滇西洱源盆地高温热泉水文地球化学特征及其地质意义
Hydrogeochemical Characteristics and Geological Implications of High-temperature Geothermal Groundwater in the Eryuan Basin,Western Yunnan
摘要
Abstract
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℃.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.关键词
高温热泉/水文地球化学/氢氧同位素/自组织映射神经网络/洱源盆地Key words
high-temperature hydrothermal spring/hydrogeochemistry/hydrogen and oxygen isotopes/self-organizing map neural network/Eryuan Basin分类
天文与地球科学引用本文复制引用
张寿川,刘凯,杨扬,郑姝卉,张垚垚,刘晓煌,王路瑶,王家梁,刘书睿..滇西洱源盆地高温热泉水文地球化学特征及其地质意义[J].地球学报,2026,47(1):91-104,14.基金项目
本文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 （编号:2024ZD1004103）
JKYZD202401 （）
JKYQN202307)联合资助. This study was supported by the Deep Earth Probe and Mineral Resources Exploration-National Science and Technology Major Project(No.2024ZD1004103),China Geological Survey(No.DD20221677-2),and the Basal Research Fund of the Chinese Academy of Geological Sciences(Nos.JKY202406,JKYZD202401,and JKYQN202307). （No.2024ZD1004103）
