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帕米尔构造结及邻区的晚新生代构造与现今变形
引用本文:陈杰,李涛,李文巧,袁兆德.帕米尔构造结及邻区的晚新生代构造与现今变形[J].地震地质,2011,33(2):241-259.
作者姓名:陈杰  李涛  李文巧  袁兆德
作者单位:中国地震局地质研究所地震动力学国家重点实验室;
基金项目:科技部国际科技合作计划项目(2008DFA20860); 地震动力学国家重点实验室自主研究课题(LED2010A04); 我国地震重点监视防御区活动断层地震危险性评价项目资助
摘    要:帕米尔构造结是中国大陆受板块动力作用和地震活动最强烈的地区之一.晚新生代帕米尔构造结北部向北楔入推移了约300km,但对这一变形过程至今未能很好的限定.帕米尔构造结的晚新生代构造变形在空间上是不对称的.帕米尔西缘表现为NW向的径向逆冲,伴随着塔吉克盆地东部块体绕垂直轴的逆时针旋转.在帕米尔东部,构造变形的方式、空间分布...

关 键 词:帕米尔构造结  晚新生代构造  拉张作用  径向逆冲  弧形弯曲
收稿时间:2011-06-20
修稿时间:2011-06-25

LATE CENOZOIC AND PRESENT TECTONIC DEFORMATION IN THE PAMIR SALIENT,NORTHWESTERN CHINA
CHEN Jie,LI Tao,LI Wen-qiao,YUAN Zhao-de.LATE CENOZOIC AND PRESENT TECTONIC DEFORMATION IN THE PAMIR SALIENT,NORTHWESTERN CHINA[J].Seismology and Geology,2011,33(2):241-259.
Authors:CHEN Jie  LI Tao  LI Wen-qiao  YUAN Zhao-de
Institution:CHEN Jie LI Tao LI Wen-qiao YUAN Zhao-de(State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China)
Abstract:The northern margin of the Pamir salient indented northward by ~300km during the late Cenozoic,however,the spatiotemporal evolution of this process is still poorly constrained.Regional deformation within the Pamir salient is asymmetric.Previous work has shown that deformation along the western flank of the Pamir was accommodated by northwest-directed radial thrusting and associated anticlockwise vertical axis rotation of the Pamir over the eastern margin of the Tajik Basin,along with a component of left-slip faulting along the Darvaz Fault.In contrast,subduction of the Tajik-Tarim Basin beneath the Pamir along the MPT was absorbed along the eastern margin of the salient by dextral-slip along the Kashgar-Yecheng transfer system,accompanied with Oligocene-Miocene northward underthrusting,thickening and widespread melting of the middle and lower crust beneath the Pamir,eventually led to east-west extension along the Kongur Shan extensional system at ~7~8Ma.The slip rate of the KYTS decreased substantially from 11~15mm/a to 1.7~5.3mm/a since at least 3~5Ma,termination of slip along the northern segment of the Karakorum Fault occurred almost at the same time.Late Quaternary and present active deformation in the Pamir is dominated by east-west extension along the Kongur Shan extensional system and north-south contraction along the PFT and the Atux-Kashi fold belts in the southern margin of Tianshan.
Keywords:Pamir salient  late Cenozoic deformation  east-west extension  radial thrusting  oroclinal bending  
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