论文部分内容阅读
西南三江地区(怒江、澜沧江、金沙江)是印度与欧亚两大板块之间特提斯—喜马拉雅构造域的东段挤压、褶皱最强烈的地带;形成有规模很大、数量甚多的弧形深断裂,其中三江主干深断裂都是板块俯冲带。它们既是该区的构造骨架又是最主要的岩浆—变质—成矿带。自晋宁运动开始,构造作用就极为强烈,深断裂—俯冲带的构造演化十分复杂; 特别是因受到 K_2-E_1时印度板块(尤其是东北角)的强烈冲击,严重干扰、破坏了某些重要俯冲标志,以致迄今有不少问题难予解决。
The Sanjiang area in the southwest (Nujiang, Lancang and Jinshajiang) is the area where the eastern part of Tethys-Himalayan tectonic domain between India and Eurasia is the strongest and the most intense is the folds; the formation of a large scale and a large number of Arc deep fracture, in which the three deep faults are the plate subduction zone. They are both the structural framework of the area and the most important magmatic-metamorphic-metallogenic belt. Since the beginning of the Jinning movement, the tectonic function has been extremely strong. The tectonic evolution of the deep fault-subduction zone is very complicated. In particular, due to the strong impact from the Indian plate (especially the northeast corner) upon K_2-E_1, it seriously disrupted some Important subduction signs, so that so far a lot of problems difficult to solve.