| 帕米尔北缘木什背斜第四纪滑脱褶皱作用与北翼逆断裂的生长 |
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| 引用本文： | 肖伟鹏,陈杰,李涛,李文巧,Thompson J.帕米尔北缘木什背斜第四纪滑脱褶皱作用与北翼逆断裂的生长[J].地震地质,2011,33(2):289-307. |
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| 作者姓名： | 肖伟鹏 陈杰 李涛 李文巧 Thompson J |
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| 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;中国矿业大学(北京)地球科学与测绘工程学院;Department of Earth Science;University of California; |
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| 基金项目： | 科技部国际科技合作计划项目(2008DFA20860); 我国地震重点监视防御区活动断层地震危险性评价项目; 地震动力学国家重点实验室自主研究课题(LED2010A04)共同资助 |
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| 摘 要： | 发育在帕米尔弧形推覆构造带最前缘的木什活动背斜是一南缓北陡的第四纪滑脱褶皱,背斜的最小地壳缩短量为0.7km,构造隆升幅度可达1.5km.木什背斜北翼逆断层由一系列坡向北的反向断层陡坎组成,不同断坎间垂直位移分布呈现此消彼长的特征,不论是整个北翼逆断层西段还是单条断坎,其垂直位移均呈东高西低的不对称分布,位移梯度东高西...
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| 关 键 词： | 帕米尔 木什背斜 褶皱相关逆断层 断层陡坎 断层位移-长度标度律 |
| 收稿时间： | 2011-04-09 |
| 修稿时间： | 2011-05-17 |
QUATERNARY DETACHMENT FOLDING AND PROPAGATION OF NORTH LIMB FAULT OF MUSHI ANTICLINE,NORTHERN MARGIN OF THE PAMIR |
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| XIAO Wei-peng,CHEN Jie,LI Tao,LI Wen-qiao,Thompson J.QUATERNARY DETACHMENT FOLDING AND PROPAGATION OF NORTH LIMB FAULT OF MUSHI ANTICLINE,NORTHERN MARGIN OF THE PAMIR[J].Seismology and Geology,2011,33(2):289-307. |
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| Authors: | XIAO Wei-peng CHEN Jie LI Tao LI Wen-qiao Thompson J |
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| Institution: | XIAO Wei-peng1,2) CHEN Jie1) LI Tao1) LI Wen-qiao1) Thompson J3)1)State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China2)College of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing 100083,China3)Department of Geological Sciences,University of California,Santa Barbara,CA 93106,USA |
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| Abstract: | The Mushi anticline locates at the frontier Pamir arcuate nappe tectonics belt(PFT),which is a detachment fold with a gentle south limb and steep north limb,and its earth crust minimum shortening is ～0.7km with uplift up to 1.5km.The north limb fault of Mushi anticline is composed of a series of obsequent slope fault scarps,and the distribution of vertical displacements among different fault scarps presents a pattern of one increasing and the other decreasing.No matter of the entire western segment of the northern limb faults or a single fault,the displacement distribution is asymmetric,that is,high in the east and low in the west,and the same to displacement gradient.This may reflect the late Quaternary folding of Mushi anticline as being intensive in the east and feeble in the west.The fault may be a shallow,rootless secondary fault formed during the growth process of the anticline in order to accommodate the constantly decreased space of anticline nucleus as the fold tightened gradually.The late Quaternary shortening rate of the fault is 0.8mm/a,absorbing only one fifth of the nowadays crustal shortening rate of the region.The growth of Mushi anticline and the north limb fault of Mushi anticline both are in accordance with global fault dataset scaling relationship,that is,fault length is over 100m.The power-law regression scaling exponent of west segment of the northern limb fault of Mushi anticline is n=1.37(R2=0.88),and its specific value(k)of maximum fault displacement and fault length is far less than that of the Mushi anticline,which is ～4.3％,but 1～2 orders of magnitude larger than that of global fault dataset(10-4～10-5). This may show that the northern limb fault of Mushi anticline is the offshoot of several moderate strong earthquakes,and it is still in initial stages. |
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| Keywords: | Pamir Mushi anticline fold-related thrust fault fault scarp displacement-length scaling relationship |
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