Abstract The Adong hot springs in the Meso-Proterozoic metamorphic rocks are located in Deqin county in northwestern Yunnan of China in the Yunnan-Tibet geothermal belt with travertine deposition. Different from many other hot springs which emerge along rivers or in valleys in Yunnan, the springs emerge on the mountain slope about 100 m above the local River. Little is known about the genesis and state of travertine deposition in the hot springs. The study of the hot springs will be helpful to enrich the understanding of research on geothermal resources and travertine deposition in northwestern Yunnan and the application of hydrogeochemical and isotopic methods to research on geothermal water and travertine. The results show that: (1) the major hydrogeochemical processes are the dissolution of Na-feldspar, carbonate rocks, oxidation of H2S, precipitation of calcite and geothermal and cold water mixing, and sodium sulfate minerals could be a source of Na and SO4. (2) The isotope data indicates that the geothermal water is meteoric in origin with a slight “18O shift” and a reservoir depth of 4525-4750 m is also estimated. (3) A reservoir temperature (190-199 ℃) is attained with the quartz geothermometers and silica-enthalpy graphic method. (4) The groundwater circulates deeply along the flow paths after receiving the recharge from infiltration of precipitation or snow melt water from the Cali and Jiawu snow mountains, and then ascends toward the land surface in the form of hot springs after heated by the heat flow and mixed by cold water with mixing ratios of about 75%-80%. (5) Comparative analyses of the hydrochemistry of the spring waters illustrate that the Adong hot springs are more easy to deposit travertine in wet season and vents YN1, YN2 and YN3 still tend to deposit travertine.

中文翻译：

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滇西北阿东温泉的赋存、成因及钙华沉积

摘要 中元古代变质岩中的阿东温泉位于云南西北部德钦县钙华沉积的滇藏地热带中。与云南其他许多沿河或山谷涌出的温泉不同，这些温泉涌出在当地河流上方约100 m的山坡上。关于温泉中钙华沉积的成因和状态知之甚少。温泉的研究将有助于丰富对滇西北地热资源和钙华沉积研究的认识，以及水文地球化学和同位素方法在地热水和钙华研究中的应用。结果表明：（1）主要的水文地球化学过程是钠长石、碳酸盐岩的溶解、H2S的氧化、方解石沉淀和地热和冷水混合，以及硫酸钠矿物可能是 Na 和 SO4 的来源。(2)同位素资料表明地热水为大气源，略有“18O位移”，估计储层深度为4525～4750m。(3) 用石英地温计和二氧化硅-焓图法获得储层温度(190-199 ℃)。(4) 地下水接受卡里雪山和甲午雪山的降水或融雪融水的入渗补给后，沿流道深度循环，被热流加热后以温泉的形式向地表上升并用冷水混合，混合比例约为75%-80%。