东昆仑山中段布尔汗布达山地区断裂特征及昆中断裂带南界讨论

布尔汗布达山西南缘属东昆仑造山带腹地,新太古代以来区域构造作用强烈。中二叠世,随着东昆仑地区多岛洋盆依次关闭,研究区形成数条近于平行的EW向深大断裂组合,构成昆中断裂带主体格架。通过研究分析与断裂相关的地形地貌、遥感影像、地球物理、岩石地层、变形变质、断裂结构组成、显微构造等,总结出主要断裂特征,并梳理了区内构造格架,针对尚未统一认识的昆中断裂带南界问题进行探讨,最终认为温冷恩断裂属昆中断裂带南界断裂。研究成果为进一步开展相关地质问题分析提供了依据。

Characteristics of the faults in Buerhanbuda Mountain area and discussion of the southern boundary of Kunzhong fault zone

The southwest margin of Buerhanbuda Mountain belongs to the hinterland of the East Kunlun orogenic belt, and it has strong regional tectonic effects since late Archean. In the Middle Permian, several nearly parallel EW deep fractures were formed in the study area with successive closure of ocean basins in multiple islands of the East Kunlun region, which are the main framework of Kunzhong fault zone. Through the analysis of landform, remote-sensing images, geophysical exploration, lithostratigraphy, deformation and metamorphism, the structure of fault, microstructure, the authors in this research summarized the main characteristics of the faults and clarified the structural framework in the area. Besides, the southern boundary of Kunzhong fault zone which has not been recognized has been discussed, and the results show that Wenleng'en fault belongs to the southern boundary of Kunzhong fault zone. This research would provide some reference for the related geological issues.