摘要
云南芒市遮放盆地位于三江造山带中南段,该区断裂发育,岩浆活动强烈,地热资源丰富,但当前研究程度较低。文章针对龙陵瑞丽大断裂东侧沉积岩区开展了地质、物探、水文地质及水文地球化学调查等工作,对采取的水样进行了水化学分析、稳定同位素分析及定量计算。利用硅-焓方程法和硅-焓图解法定量评估了温泉热水中冷水混合比,并估算了热水补给高程、补给区温度、热储温度、循环深度和温泉天然放热量。计算得出CO_(2)的^(δ13)CCO_(2)值为-16.56‰,参与水—岩反应的CO_(2)为幔源和土壤混合成因,且水—岩反应主要为CO_(2)进入储水层与围岩发生水化学作用生成HCO_(3)-,地下水水化学组分的成因类型主要为岩石风化型。进一步查明了瑶池地热流体化学特征、地热资源赋存状态、热循环机理及热源来源,分析了研究区地下热水的形成演化过程。研究成果为遮放地区地热研究提供了数据支撑及理论支持,同时也为瑶池旅游资源的可持续开发和保护提供重要的指导意义。
The Zhefang Basin in Mang City of Yunnan Province is located in the middle-south section of the Sanjiang orogenic belt.There are many faults,strong magmatism and abundant geothermal resources in this area,but research on these different aspects of this area is low at present.In this study,a geological,geophysical,hydrogeological and hydrogeochemical investigation was carried out in the sedimentary rock area on the eastern side of the Longling-Ruili Fault.Water samples were collected and subjected to hydrochemical analysis,stable isotope measurements,and quantitative calculations.The silicon-enthalpy equation method and the silicon-enthalpy diagram method were used to quantitatively evaluate the cold-water mixing ratio in hot spring water,and to estimate hot water recharge elevation,recharge zone temperature,thermal storage temperature,cycle depth,and natural heat release of the hot spring.The calculated ^(δ13)CCO_(2) value of CO_(2) is-16.56‰.The sources of CO_(2) involved in water-rock reaction are a mixture of both mantle and soil.Moreover,the water-rock reaction is mainly reflected as CO_(2) entering the reservoir and the surrounding rock to produce HCO_(3)-.The genetic type of groundwater hydrochemical components is mainly constrained by rock weathering type.The chemical characteristics of geothermal fluid,the state of occurrence of geothermal resources,the mechanism of thermal cycle and the source of heat source in Zhefang jade pool were further identified.The formation and evolution of geothermal water in the study area were analyzed.The research results provide new support for geothermal research in Zhefang area and important guidance for the sustainable development and protection of tourism resources in the jade pool.
作者
张七道
ZHANG Qidao(Kunming Comprehensive Natural Resources Survey Center,China Geological Survey,Kunming 650111,China)
出处
《高校地质学报》
CAS
CSCD
北大核心
2021年第4期489-500,共12页
Geological Journal of China Universities
基金
中国地质调查局项目(DD2016008120)资助。
关键词
遮放盆地
温泉
水文地球化学特征
稳定同位素
水岩相互作用
Zhefang basin
hotspring
hydrogeochemical characteristics
stable isotopes
water-rock interaction
