青藏高原新生代岩浆活动与地热关系探讨

青藏高原地热资源丰富,具有分布广、温度高、潜力大等特点。为了更好地评价该区地热资源潜力,探索符合青藏高原地热资源特点的勘查、开发方案,需要对地热资源分布规律及成因进行研究。在总结前人对青藏高原新生代岩浆活动和地热资源特征的基础上,从青藏高原地质演化的角度分析地热资源分布的控制因素,探讨新生代岩浆活动与地热资源的空间展布关系,重点讨论藏南地区地热区划和雅鲁藏布缝合带岩浆活动之间的关系。结果表明: 青藏高原地热活动受控于地质构造演化,具有南强北弱的分布特点; EW向区域性构造缝合带和SN向深大断裂的交汇部位是地热的主要活跃区域,不同的岩浆活动为地热提供热源。

Discussion on the relationship between Cenozoic magmatic activity and geotherm in Tibetan Plateau

There are abundant geothermal resources and nearly 700 geothermal display areas (points) in Tibetan Plateau with the characteristics of wide distribution, high temperature and great potentiality. It is necesssary to investigate the distribution regularity and causes of geothermal resources, in order to better evaluate the geothermal resources and explore the exploitation and development plan that conforms to the characteristics of the geothermal resources in Tibetan Plateau. On the basis of summarizing previous studies on the Cenozoic magmatic activity and the characteristics of geothermal resources in Tibetan Plateau, the authors analyzed the controlling factors of geothermal resources distribution from the perspective of geological evolution of the Tibetan Plateau, and discussed the relationship between Cenozoic magmatic activity and the geothermal resources spatial distribution. They focused on the relationship between the geothermal regionalization of Zangnan and the magmatic activity of the Yarlung Zangbo Suture Zone. The results show that the geothermal activity in Tibetan Plateau is controlled by the geological tectonic evolution. And the geothermal activity in southern region is stronger than that in the northern region. The main active area of geothermal activity is the intersection of the EW regional tectonic suture zone and the NS deep fault. The magmatic activity provides the heat source for geothermal resources in the study area.