云南大理地区温泉成因分析

Analysis on the Origin of Hot Springs in Dali,Yunnan

云南大理地区处于构造体系复合部位,各构造体系主干断裂活动较为强烈,给地下热水的形成和运移提供了有利的条件。根据地下热水的空间展布情况与地质构造的关系,将研究区分为西部隆起区、中部沉降区和东部隆起区三大热水带。西部隆起区共出露9个温泉,呈带状分布,展布方向与构造带基本一致,多以泉群出露,其中片岩水量较小,灰岩水量较大。中部沉降区共出露9温泉,展布方向受北北西向构造控制明显,多以单泉形式出露地表,流量大小与含水层岩性密切相关。东部隆起区面积较小,共出露2个温泉,均分布在北北西向构造带上,以单泉形式出露。研究表明,隆起区温泉分布与北北西向构造带一致,沉降区构造复合带多出露温泉,并且热储层多以变质岩为主,其热源可能为循环增温、断裂带挤压摩擦以及岩脉余热。研究成果对地热资源开发利用以及科学研究有重要意义。

The Dali area in Yunnan is located in the composite part of the tectonic system, and the main faults of each tectonic system are relatively active, which provides favorable conditions for the formation and migration of underground hot water. According to the relationship between the spatial distribution of underground hot water and the geological structure, the study area is divided into three hot water belts: the western uplift area, the central subsidence area and the eastern uplift area. A total of 9 hot springs are exposed in the western uplift area, which are distributed in a belt shape, and the distribution direction is basically the same as that of the tectonic belt. A total of 10 hot springs are exposed in the central subsidence area. The distribution direction is obviously controlled by the north-north-west structure. Most of them are exposed to the surface in the form of single springs. The flow rate is closely related to the lithology of the aquifer. The area of the eastern uplift area is relatively small, and two hot springs are exposed, both of which are distributed in the NW-trending structural belt and exposed in the form of a single spring.Studies have shown that the distribution of hot springs in the uplift area is consistent with the NW trending structural belt, the structural composite belt in the subsidence area is mostly exposed to hot springs, and the thermal reservoirs are mostly metamorphic rocks. Rock dike waste heat. The research results are of great significance to the development and utilization of geothermal resources and scientific research.