今天是2018年12月11日

东喜马拉雅构造结东、西边界断裂 对比及其构造演化过程

DOI:10.3799/dqkx.2018.701

作者:董汉文,许志琴,曹 汇,李 源,刘 钊,李化启, 易治宇,陈希节,马绪宣,吴 婵

联系地址:中国地质科学院地质研究所,北京 100037

摘要:为了查明东喜马拉雅构造结东、西边界断裂的关系,及其印度与欧亚板块碰撞以来东喜马拉雅构造结的构造演化过程.在综合野外填图、构造观察、代表性岩石的锆石LA-ICP-MS U-Pb测年分析及前人研究的基础上,对东构造结两条边界断裂的几何学、运动学特征进行对比,讨论了两条断裂的多期次、多阶段的变形特征,还探讨了在东构造结地区自印度板块-欧亚板块碰撞以来的演化历史.结果显示,东构造结两条边界断裂几何学和运动学非常相似,构造变形具有明显的同时代、同期次特点,共同经历从碰撞、持续俯冲-折返、直到后期垮塌-隆升等一系列重要的地质事件.

关键字:东喜马拉雅构造结;边界断裂;锆石LA-ICP-MS U-Pb测年;构造

Comparison of Eastern and Western Boundary Faults of Eastern Himalayan Syntaxis, and Its Tectonic Evolution

Author:Dong Hanwen, Xu Zhiqin, Cao Hui, Li Yuan, Liu Zhao, Li Huaqi, Yi Zhiyu, Chen Xijie, Ma Xuxuan, Wu Chan

Author Address:Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Abstract:It is important to clarify the relationship between the eastern and western boundary faults of the eastern Himalayan syntaxis (EHS), and tectonic evolution of the eastern Himalayan syntaxis (EHS) since the collision of the Indian and Eurasian plates. Combined with field mapping, structure observations, zircon U-Pb geochronological investigations and previous studies of the EHS, this study identifies and describes the architecture and kinematics of the two boundary faults, discusses their multi-stage of deformation, also the evolution of the study area since the collision of Indian and Eurasian plates. The results show that the two boundary shear zones are similar in architecture and kinematics, and their tectonic deformation is obviously contemporaneous and in same stage, having experienced a series of important geological events, including the collision, subduction-exhumation and collapse-uplift.

Keyword:eastern Himalayan syntaxis; boundary fault; zircon LA-ICP-MS U-Pb dating; tectonics

 

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作者简介:董汉文(1988-),男,副研究员,博士,主要从事喜马拉雅造山带构造变形及岩石大地构造方面的研究.ORCID: 0000-0002-1477-3931. E-mail: donghanwen123@126.com

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