Kinematics and dynamics of the Namche Barwa Syntaxis, eastern Himalaya Constraints from deformation, fabrics and geochronology

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	Kinematics and dynamics of the Namche Barwa Syntaxis, eastern Himalaya Constraints from deformation, fabrics and geochronology
	Xu, ZQ (Xu, Zhiqin); Ji, SC (Ji, Shaocheng); Cai, ZH (Cai, Zhihui); Zeng, LS (Zeng, Lingsen); Geng, QR (Geng, Quanru); Cao, H (Cao, Hui)
刊名	GONDWANA RESEARCH
	2012
卷号	21 期号:1 页码:19-36
关键词	Namche Barwa Syntaxis Eastern Himalaya Tectonic deformation Geochronology Geodynamics
ISSN号	1342-937X
英文摘要	Field observations, deformation and fabric analyses, and precise age data acquired by zircon SHRIMP, LA-ICP-MS U-Pb and Ar-40-Ar-39 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 55-40 Ma, and crustal materials at this corner were subducted to depths >70 km where they experienced HP (UHP?) metamorphism. Since 40 Ma, 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 22-18 Ma and then to the shallow crust to form an antiformal dome at 6-2 Ma. Our model provides new insight into the processes of post-collisional crustal thickening related to the formation of the Himalayan orogenic belt. (C) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
学科主题	构造地质学
WOS关键词	HIGH-PRESSURE GRANULITES ; SOUTHERN TIBET ; SOUTHEASTERN TIBET ; NANGA-PARBAT ; PREFERRED ORIENTATIONS ; METAMORPHIC EVOLUTION ; TETHYAN HIMALAYA ; HIGH-TEMPERATURE ; C-SLIP ; ZIRCON
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000300204400003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39739]
专题	中国地质调查局
作者单位	Minist Land & Resources, Chengdu Inst Geol & Mineral Resources, Chengdu 610082, Peoples R China
推荐引用方式 GB/T 7714	Xu, ZQ ,Ji, SC ,Cai, ZH ,et al. Kinematics and dynamics of the Namche Barwa Syntaxis, eastern Himalaya Constraints from deformation, fabrics and geochronology[J]. GONDWANA RESEARCH,2012,21(1):19-36.
APA	Xu, ZQ ,Ji, SC ,Cai, ZH ,Zeng, LS ,Geng, QR ,&Cao, H .(2012).Kinematics and dynamics of the Namche Barwa Syntaxis, eastern Himalaya Constraints from deformation, fabrics and geochronology.GONDWANA RESEARCH,21(1),19-36.
MLA	Xu, ZQ ,et al."Kinematics and dynamics of the Namche Barwa Syntaxis, eastern Himalaya Constraints from deformation, fabrics and geochronology".GONDWANA RESEARCH 21.1(2012):19-36.