Two-phase intracontinental deformation mode in the context of India–Eurasia collision: insights from a structural analysis of the West Kunlun–Southern Junggar transect along the NW margin of the Tibetan Plateau
Two-phase intracontinental deformation mode in the context of India–Eurasia collision: insights from a structural analysis of the West Kunlun–Southern Junggar transect along the NW margin of the Tibetan Plateau
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DOI：
10.1144/jgs2021-029
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发表时间：
2021-08
影响因子：
2.7
通讯作者：
Hanlin Chen;Xiubin Lin;Xiaogan Cheng;J. Gong;Shuang Bian;Lei Wu;C. Jia;Shufeng Yang;
中科院分区：
文献类型：
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作者：
Hanlin Chen;Xiubin Lin;Xiaogan Cheng;J. Gong;Shuang Bian;Lei Wu;C. Jia;Shufeng Yang;
新生代早期开始的印度板块与欧亚板块的汇聚作用，形成了青藏高原和环青藏高原盆地造山系。会聚驱动应变何时以及如何传播到该系统中对于解释青藏高原的生长过程具有重要意义。通过对青藏高原西北缘西昆仑-南准噶尔断面沿着的构造分析，建立了变形的传播过程，并由此确定了高原的生长过程。我们的研究结果表明，两相变形模式。第一阶段的变形主要发生在早第三纪的西昆仑造山带、布楚隆起和天山造山带等先存软弱带内，陆内应变主要由这些软弱带的缩短所消耗。第二阶段的特征是早中新世以来变形向前陆地区传播，前陆褶皱冲断带沿着缩短数十公里，盆地向内减小，对吸收陆内应变起关键作用。我们认为，这两个阶段的变形模式可能反映了青藏高原的扩张从一个刚性块体的关键楔锥式的控制机制的转变。专题集：本文是褶皱-冲断带专题集的一部分，可在https://www.lyellcollection.org/cc/fold-and-thrust-belts上找到。
The convergence of India and Eurasia, which began in the early Cenozoic, established the Tibetan Plateau and the Circum-Tibetan Plateau Basin and Orogen System. When and how the convergence-driving strain propagated into this system is important in deciphering the growth processes of the Tibetan Plateau. We conducted a structural analysis of the West Kunlun–southern Junggar transect along the NW margin of the Tibetan Plateau to establish the propagation of deformation and, through this, to determine the plateau growth processes. Our results suggest a two-phase deformation mode. The first-stage features deformation confined to pre-existing weak zones (e.g. the West Kunlun orogen, the Buchu Uplift and the Tian Shan orogen) during the Paleogene, when the intracontinental strain is speculated to be mainly consumed by shortening of these weak zones. The second stage is characterized by deformation propagating into the foreland regions since the early Miocene, where shortening along the foreland fold–thrust belts on a scale of tens of kilometres and decreasing basinwards had a key role in absorbing intracontinental strain. We suggest that this two-phase deformation mode may reflect a shift in the governing mechanism of the expansion of the Tibetan Plateau from a rigid block to a critical wedge taper style. Thematic collection: This article is part of the Fold-and-thrust belts collection available at: https://www.lyellcollection.org/cc/fold-and-thrust-belts