煤田地质与勘探2024，Vol.52Issue(1)：56-69,14.DOI:10.12363/issn.1001-1986.23.10.0689
云南落漏河流域温泉水化学特征及成因模式
Hydrochemistry characteristics and genesis mode of hot springs in the Luolou River basin,Yunnan,China
摘要
Abstract
The hydrochemistry and genesis mechanism of thermal springs hold great significance for the exploitation and utilization of low to intermediate temperature geothermal resources.Under the influence of a concealed fault zone,thermal springs in the Luolou River basin,Yunnan Province,are distributed along both sides of valleys and exposed in Quaternary loose deposits and Permian basalt strata.It belongs to low to intermediate temperature thermal spring water,with temperatures ranging between 34.5 and 50.0℃ ,pH is between 7.62-9.73,TDS is between 262-702 mg/L.Based on the hydrochemical and isotopic tests of thermal spring samples and nearby cold water samples from the Luolou River basin,this study explored the hydrological cycle,hydrochemical evolution,and genesis mode of the thermal springs and groundwater using the hydrogeochemical method.The results show that the thermal spring water has a hydrochemical type of HCO3-Na due to the mixing of HCO3-Ca type shallow cold groundwater.Furthermore,the chemical composi-tions of the thermal springs and cold groundwater are influenced by the leaching of silicate and carbonate minerals.Hy-drogen and oxygen isotope analysis indicates that the thermal springs and cold groundwater are primarily recharged by meteoric precipitation,with recharge elevation ranging from 2 007 to 2 307 m.The recharge area is the mountain range of the valley,such as the northwest Maer Mountain,the north Guogai Mountain and the central Zuojia Mountain.The thermal springs exhibit reservoir temperatures ranging from 68.4 to 150.0℃ ,as estimated using silica geothermometers,silica-enthalpy mixing model,and multi-mineral equilibrium simulations.The mixing ratio of cold water is estimated to be 77.9% -90.5% by silica-enthalpy mixing model.Regarding the genesis mode of thermal springs in the Luolou River basin,the atmospheric precipitation infiltrates along the fissure or karst channel,and is then heated by terrestrial heat flow during deep underground circulation with a depth of 2 872-3 724 m.Afterward,driven by the high temperature and the density difference between cold and hot water,the water upwells along the concealed Bailiancun fault zone,exposed as low to intermediate temperature thermal springs in the Quaternary strata.The results of this study will provide a basis for the exploitation and utilization of hot springs in the Luolou River basin and exploring the exploitation potential of the same type of low to intermediate temperature geothermal resources.关键词
落漏河流域/温泉/水化学特征/热储温度/多矿物平衡模拟/成因模式Key words
Luolou River basin/thermal spring/hydrochemistry characteristics/reservoir temperature/multiple mineral equilibrium simulation/genesis mode分类
天文与地球科学引用本文复制引用
罗欢,刘振南,马一奇,张云辉,陶兰初,陈庆松,符敦凯,吴湘川..云南落漏河流域温泉水化学特征及成因模式[J].煤田地质与勘探,2024,52(1):56-69,14.基金项目
国家自然科学基金项目(42072313,42102334) （42072313,42102334）
中国地质调查局项目(DD20230483,DD20230098) （DD20230483,DD20230098）
四川省科技厅项目(2022NSFSC0413,2023YFS0356) （2022NSFSC0413,2023YFS0356）
