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阿尔金断裂东段的构造转换模式
投稿时间:2019-09-11  修订日期:2020-01-06  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020135
摘要点击次数: 23
全文下载次数: 30
作者单位E-mail
罗浩 中国地震灾害防御中心 hy-luo@163.com 
徐锡伟 中国地震局地壳应力研究所  
刘小利 中国地震局地震研究所  
白鸾羲 中国地震局地质研究所  
王启欣 中国地震局地质研究所  
李梦妮 中国地震局地质研究所  
刘绍卓 中国地震局地质研究所  
基金项目:地震科研行业专项“中国地震活断层探察—南北地震带北段”(编号20140802306)、中国科学院战略性先导科技专项(A类)课题(编号 XDA20070300)和国家自然科学基金项目(编号U1839204、41372217)
中文摘要:大型走滑断裂控制着青藏高原的变形,众多学者通过阿尔金断裂来探索青藏高原北部的构造变形过程。基于野外调查和前人的研究结果可知阿尔金断裂的滑动速率在肃北—疏勒河口段表现为三联点两侧的突降,祁连山西段的逆冲和走滑断裂吸收了阿尔金断裂的左旋位移。由于祁连山内部次级断裂活动性的增强,现存阿尔金断裂连续地表破裂终止于酒泉盆地西侧,但位于其东侧的断裂系仍属于阿尔金断裂。在Kohistan岛弧与欧亚板块碰撞之后,青藏高原沿阿尔金断裂曾发生滑动速率近一致的侧向挤出,断裂两侧此时并未发生明显的隆起。随后东昆仑造山带和祁连山造山带的先后大规模隆升,高原的北东向挤出迅速减弱。阿尔金断裂北东向挤出能力与东昆仑造山带和祁连山造山带的隆起存在明显的耦合作用。
中文关键词:走滑活动, 变形模式, 阿尔金断裂, 祁连山, 青藏高原
 
Structural deformation pattern in the east segment of the Altyn Tagh fault
Author NameAffiliationE-mail
luo Hao China earthquake disaster prevention center, China Earthquake Administration hy-luo@163.com 
Xu Xiwei Institute of crustal dynamics, China Earthquake Administration  
Liu Xiaoli Institute of seismology, China Earthquake Administration  
Bai Luanxi Institute of Geology, China Earthquake Administration  
Wang Qixin Institute of Geology, China Earthquake Administration  
Li Mengni Institute of Geology, China Earthquake Administration  
Liu Shaozuo Institute of Geology, China Earthquake Administration  
Abstract:The large left lateral strike-slip faults are responsible for continental deformation of Qinghai-Tibet Plateau. Recent researches on Altyn Tagh fault have called attention to view of how northern edge of the Plateau has grown. Field survey and previous results suggest that the slip rate of Altyn Tagh fault reduced abruptly at two sides of triple junction from Subei County to Shule River and the thrust faults, strike faults in western segment of the Qilian Mountain absorbed the sinistral displacement of Altyn Tagh fault, and thus the present trace disappeared in west of Jiuquan basin. But the Altyn Tagh fault had ever extended into Alxa block before mid-Miocene. The Plateau began to extend laterally along the Altyn Tagh fault at the almost same slip rate after collision between the kohistan and Eurasian plates, and there is no obvious uplift on both sides of the fault. Then, the East Kunlun and Qilian orogenic belts prominently uplifted successively, and the lateral extension of the Altyn Tagh fault decreased rapidly. Therefore, a coupling interaction exists between the extrusion of the Altyn Tagh fault and the uplift of the East Kunlun and Qilian orogenic belts.
keywords:Strike-slip fault, Transform model, Altyn Tagh fault, Qilian Mountain, Qinghai-Tibet Plateau
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