The available hot-spring data show that the geothermal field along the Dali-Ruili railway in western Yunnan Province has different subareas. The authors studied die distribution characteristics of igneous rocks, active faults, earthquakes in history and other related geophysical fields, such as MT and P wave velocity in the crust in this area. The results show that the distribution of the middle/ high geothermal subareas is spatially well consistent with that of the igneous rocks and the active fault system. It is also concluded that there are three types of hot springs based on the caloric origin in this area, I.e., magma type, deep circle through deep-cut fault type and magma-deep circle type. Studies also show that there is spatial correlation between the distribution of the hot springs and that of the earthquakes in history. An integrated analysis of all the data obtained has led the authors to believe that the geo-thermal field in this area can act as an index for the estimation of the geo-engineering stability.%在整理、分析云南大理至瑞丽拟建铁路沿线及其邻区现今地温场分布特征的基础上,进一步总结前人的资料,综合研究、探讨了该区地温场与岩浆活动、活动构造、地震活动、区域深部构造的关系.结果表明,该区中高温温泉(中高地温场)的空间分布与地表岩浆岩的出露、地表主要活动断裂带的分布都具有较好的对应关系.综合研究后认为,该区的中高温温泉可归结为岩浆热源型、断裂深循环型和岩浆热源叠加断裂深循环作用型3种基本成因类型.同时还发现,该区的温泉分布与区域地震活动空间上也存在密切的关系,并据此将区内划分为4个地震区带.研究结果表明,本区地表温泉分布所反映出的地温场特征对本区的工程稳定性评价具有重要的指示意义.
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