论文部分内容阅读
通过对东南亚和哀牢山红河构造带演化已有模式的分析,在近年来本区海上研究资料的基础上,结合滇西地质情况,认为东南亚的构造格局是由印度洋、太平洋和欧亚三大构造体系共同作用形成的。60～15 Ma BP,欧亚构造体系分别与太平洋和印度洋构造体系作用,在东南亚东、西部形成两个弧后盆地扩张体系,两体系扩张强度和方向的不同,形成转换调节构造带——哀牢山红河构造带。东部较强的扩张作用使扬子板块向北运动,形成哀牢山以东的逆冲构造。并导致哀牢山红河构造带的左行走滑。大约15 Ma BP之后,印度洋构造体系作用的加强引发印支板块向东南逃逸,形成挤出模式。构造机制的改变使印支板块以南及以西从张扭变为压扭体制,同时使哀牢山红河构造带经受了两期不同变形机制的左行走滑。
Based on the analysis of the existing models of evolution of the Honghe tectonic belt in Southeast Asia and Ailaoshan Mountains, based on the sea research data of this area in recent years and the geological conditions in western Yunnan, it is concluded that the structural pattern of Southeast Asia consists of the three major Indian Ocean, Pacific and Eurasian Tectonic system formed by the joint action. 60 ~ 15 Ma BP. The Eurasian tectonic system interacts with the tectonic system of the Pacific Ocean and the Indian Ocean, respectively, and forms two post-arc basin expansion systems in the east and west of Southeast Asia. The strength and direction of the expansion of the two systems are different, forming a conversion regulation zone Rishan Honghe tectonic belt. The strong expansion in the east moved the Yangtze plate northwards, forming a thrust structure to the east of Ailao Mountain. And led to the Ailao Mountain Honghe tectonic belt on the left slipping. After about 15 Ma BP, the intensification of the Indian Ocean tectonic system led the Indo-China Plate to southeast to form an extrusion mode. The change of tectonic mechanism made the southwest and west of the Indo-China Plate transform from tension to torsion system, meanwhile, the Honghe tectonic belt of Ailao Mountain endured two stages of left-lateral slip with different deformation mechanisms.