Kinematics and dynamics of the Namche Barwa Syntaxis, eastern Himalaya: Constraints from deformation, fabrics and geochronology
Kinematics and dynamics of the Namche Barwa Syntaxis, eastern Himalaya: Constraints from deformation, fabrics and geochronology
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喜马拉雅东部南迦巴瓦构造的运动学和动力学：来自变形、结构和地质年代学的约束
DOI：
10.1016/j.gr.2011.06.010
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发表时间：
2012
影响因子：
6.1
通讯作者：
Cao, Hui
中科院分区：
文献类型：
--
作者：
Cai, Zhihui;Zeng, Lingsen;Geng, Quanru;Cao, Hui
野外观测、变形和组构分析以及锆石SHRIMP、LA-ICP-MS U-Pb和~（40）Ar-~（39）Ar测年等方法获得的精确年龄数据，对喜马拉雅山东角南迦巴瓦构造结（NBS）的运动学和动力学特征提供了新的制约。建立了一个两阶段模型来解释国家统计局的形成和演变。印度板块向北俯冲至拉萨盆地之下始于55- 40 Ma，该处地壳物质俯冲深度> 70 km，经历了高压（超高压？）变质作用自40 Ma以来，沿着实皆市断裂的大规模右行走滑适应了印度板块东角相对于印支地块的快速北移。这导致了印度-雅鲁藏布江缝合带（IYSZ）的显著和渐进的弯曲，使其成为西部的东九-米林左行走滑剪切带（DMSZ）和东部的阿尼桥-墨脱右行走滑剪切带（AMSZ）。这两个带都经历了强烈的糜棱石化作用。与此同时，惠普（UHP？）变质岩石在22- 18 Ma时迅速折返到地壳深部，在6- 2 Ma时迅速折返到地壳浅部，形成反形穹隆。我们的模型提供了新的见解碰撞后地壳增厚的喜马拉雅造山带的形成有关的过程。
Field observations, deformation and fabric analyses, and precise age data acquired by zircon SHRIMP, LA–ICP-MS U–Pb and40Ar–39Ar dating methods have yielded new constraints on the kinematics and dynamics of the Namche Barwa Syntaxis (NBS) which is the eastern corner of the Himalaya. A two-stage model has been established to explain the formation and evolution of the NBS. The northward indentation of the Indian plate beneath the Lhasa terrane began at 55–40Ma, and crustal materials at this corner were subducted to depths >70km where they experienced HP (UHP?) metamorphism. Since 40Ma, large-scale, right-lateral strike–slip along the Sagaing fault has accommodated the rapid northward movement of the eastern Indian plate corner with respect to the Indochina block. This caused significant and progressive bending of the Indus-Yarlung suture zone (IYSZ) such that it became the Dongjiu-Milin left-lateral, strike–slip, shear zone (DMSZ) in the west and the Aniqiao-Motuo right-lateral, strike–slip, shear zone (AMSZ) in the east. Both zones underwent strong mylonitization. Meanwhile, the HP (UHP?) metamorphic rocks were rapidly exhumed, first into the deep crust at 22–18Ma and then to the shallow crust to form an antiformal dome at 6–2Ma. Our model provides new insight into the processes of post-collisional crustal thickening related to the formation of the Himalayan orogenic belt.
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影响因子：
6.1
作者：
Zeming Zhang;Xin Dong;M. Santosh;Feng Liu;Wei Wang;Fei Yiu;Zhenyu He;K. Shen
通讯作者：
Zeming Zhang;Xin Dong;M. Santosh;Feng Liu;Wei Wang;Fei Yiu;Zhenyu He;K. Shen
影响因子：
2.9
作者：
A. Replumaz;A. Negredo;S. Guillot;A. Villaseñor
通讯作者：
A. Replumaz;A. Negredo;S. Guillot;A. Villaseñor
DOI：
10.1146/annurev.ea.23.050195.002111
发表时间：
1995
影响因子：
14.9
作者：
P. Koons
通讯作者：
P. Koons
影响因子：
2.9
作者：
P. Blumenfeld;D. Mainprice;J. Bouchez
通讯作者：
P. Blumenfeld;D. Mainprice;J. Bouchez
影响因子：
5.8
作者：
M. J. Jessup;D. Newell;J. Cottle;Aaron Berger;J. Spotila
通讯作者：
M. J. Jessup;D. Newell;J. Cottle;Aaron Berger;J. Spotila