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天山的晚新生代构造变形及其地球动力学问题
引用本文:张培震,冯先岳.天山的晚新生代构造变形及其地球动力学问题[J].中国地震,1996,12(2):127-140.
作者姓名:张培震  冯先岳
作者单位:国家地震局地质研究所,国家地震局地质研究所,国家地震局地质研究所,国家地震局地质研究所,国家地震局地质研究所,新疆维吾尔自治区地震局 100029 中国北京,100029 中国北京,100029 中国北京,100029 中国北京,100029 中国北京,830011 中国乌鲁木齐
摘    要:天山是大陆内部典型的新生代复活造山带,其新生代构造变形的方式,变形量,速度及过程等对于认识大陆内部造山带的变形机理有着重要的意义。本文在对南北天山主要活动构造地质填图和综合研究的基础上,重点探讨了天山的晚新生代构造变形特征及其动力学问题。早更新世以来,特别是早,中更新世之间,天山的构造活动由内部向南北两侧扩展,使得两侧的新生代凹陷逐渐褶皱成山,形成数排新生代褶皱带,整个天山的现代构造活动是一种扇形

关 键 词:天山  晚新生代  构造变形  地球动力学

Late Cenozoic Tectonic Deformation and Mechanism along the Tianshan Mountain, Northwestern China
Zhang Peizhen Deng Qidong Yang Xiaoping Peng Sizhen Xu Xiwei.Late Cenozoic Tectonic Deformation and Mechanism along the Tianshan Mountain, Northwestern China[J].Earthquake Research in China,1996,12(2):127-140.
Authors:Zhang Peizhen Deng Qidong Yang Xiaoping Peng Sizhen Xu Xiwei
Abstract:The Tianshan mountain is a typical Cenozoic rejuvenated mountain belt in the continental Asia. Its styles, amounts, rates, and processes of deformation provide important meaning for understanding geodynamics of other mountains in the interior of continent. On the basis of detailed field studies on major active fold and reverse fault zones in both northern and southern Tianshan, this paper discusses characteristics of late Cenozoic deformation in the Tianshan with the aim of understanding how this intracontinental mountain has been deformed. The late Cenozoic deformation in the Tainshan probably initiated between Pliocene and early Pleistocene time with the peak deformation stage in the period between early and middle Pleistocene. Deformation is characterized by crust shortening where the Tianshan thrusts both to the south and the north to form several folds and reverse fault zones along the range fronts. The newly formed fold and reverse fault zones only develop in the range-front depressions. These fold and reverse fault zones involve thin-skinned deformation of the foreland with major propagating thrust ramps near the range front. Outside the range-front depressions high-angle reverse faults merge to the surface at the base of the range with less amount of crustal shortening than that within the depression. Quantitative measurement across the range-front depressions indicate that the amount of total Quaternary crustal shortening decreases from west to east along the Tainshan mountain. It appears that compression of the Pamir Plateau to the north is probably the major driving force that caused deformation in the Tianshan.
Keywords:Rejuvenated mountain belt  Active fold-reverse fault belt  Fault-propa-gating fold Crustal shortening  Folding earthquake
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