Accommodation of India–Asia convergence via strike-slip faulting and block rotation in the Qilian Shan fold–thrust belt, northern margin of the Tibetan Plateau
Accommodation of India–Asia convergence via strike-slip faulting and block rotation in the Qilian Shan fold–thrust belt, northern margin of the Tibetan Plateau
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DOI：
10.1144/jgs2020-207
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发表时间：
2021-01
影响因子：
2.7
通讯作者：
F. Cheng;A. Zuza;P. Haproff;Chen Wu;C. Neudorf;Hong Chang;Xiangzhong Li;Bing Li
中科院分区：
文献类型：
--
作者：
F. Cheng;A. Zuza;P. Haproff;Chen Wu;C. Neudorf;Hong Chang;Xiangzhong Li;Bing Li
现有的陆内变形模型主要集中在板块状刚体运动和粘流状分布变形上。对离散右滑断裂段、释放弯曲、马尾终止展布和离断层正断层的野外和卫星观测表明，右滑断裂在海原断裂和昆仑断裂之间具有块体旋转和西-东地壳伸展的特征。日月山断层偏移阶地隆起的发光测年结果显示第四纪滑动速率为1.1 mm a−1，与前人的估计相似。在这个模型中，断层代表了应变局部化，近似于区域顺时针岩石圈流向刚性欧亚大陆时的连续变形。补充材料：发光测年程序和方案可在https://doi.org/10.17605/OSF.IO/CR9MN上找到。专题文集：本文是褶皱冲断带和相关盆地文集的一部分，可在https://www.lyellcollection.org/cc/fold-and-thrust-belts上找到
Existing models of intracontinental deformation have focused on plate-like rigid body motion v. viscous-flow-like distributed deformation. To elucidate how plate convergence is accommodated by intracontinental strike-slip faulting and block rotation within a fold–thrust belt, we examine the Cenozoic structural framework of the central Qilian Shan of northeastern Tibet, where the NW-striking, right-slip Elashan and Riyueshan faults terminate at the WNW-striking, left-slip Haiyuan and Kunlun faults. Field- and satellite-based observations of discrete right-slip fault segments, releasing bends, horsetail termination splays and off-fault normal faulting suggest that the right-slip faults accommodate block rotation and distributed west–east crustal stretching between the Haiyuan and Kunlun faults. Luminescence dating of offset terrace risers along the Riyueshan fault yields a Quaternary slip rate of c. 1.1 mm a−1, which is similar to previous estimates. By integrating our results with regional deformation constraints, we propose that the pattern of Cenozoic deformation in northeastern Tibet is compatible with west–east crustal stretching/lateral displacement, non-rigid off-fault deformation and broad clockwise rotation and bookshelf faulting, which together accommodate NE–SW India–Asia convergence. In this model, the faults represent strain localization that approximates continuum deformation during regional clockwise lithospheric flow against the rigid Eurasian continent. Supplementary material: Luminescence dating procedures and protocols is available at https://doi.org/10.17605/OSF.IO/CR9MN Thematic collection: This article is part of the Fold-and-thrust belts and associated basins collection available at: https://www.lyellcollection.org/cc/fold-and-thrust-belts