Late Paleozoic to Early Mesozoic tectonic evolution of northeast Tibet:;Evidence from the Triassic composite western Jinsha-Garze-Litang suture

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	Late Paleozoic to Early Mesozoic tectonic evolution of northeast Tibet:;Evidence from the Triassic composite western Jinsha-Garze-Litang suture
	Yang, T. -N.4; Hou, Z-Q.; Wang, Y.; Zhang, H. -R.; Wang, Z. -L.
刊名	TECTONICS
	2012
卷号	31;AR TC4004 页码:-
ISSN号	971TP
英文摘要	The Paleotethyan tectonic history of northeast Tibet remains hotly debated, particularly regarding the nature of the Jinsha suture. Different interpretations of the Jinsha suture lead to different tectonic reconstructions of northeast Tibet, southern Eurasian continent. We identified three tectonic units along the western segment of the Jinsha suture in the Yushu-Zhiduo region: the Bayan Har-Songpan-Garze fold belt (BSB), the Yushu melange, and the eastern portion of the Qiangtang block (EQ). New geochemical and geochronological studies help to identify a Triassic continental magmatic arc (the Yushu arc) that developed upon the EQ and that is geochemically similar to magmatism in the Yidun arc. Structural studies, combined with Ar-40/Ar-39 analyses, reveal a complex deformational history of the Yushu-Zhiduo region: earlier-stage top-to-the-north asymmetrical fabrics are preserved exclusively in the Yushu melange, which yields a phengite Ar-40/Ar-39 age of 230.5 +/- 0.8 Ma; later-stage orthogonal fabrics developed in the BSB and EQ (superposed upon the earlier fabrics in the Yushu melange), likely resulted from a collision between the BSB and the Yushu arc that continued until similar to 195 Ma. The structural patterns and deformation history of Yushu arc region are comparable with those recorded in the Yidun arc region. Thus, the previously defined Jinsha suture should be subdivided into western and southern segments. The western Jinsha suture is continuous with the Garze-Litang suture, while the southern Jinsha-Ailaoshan suture marks the site of the closure of several intracontinental rift basins that have likely been overprinted by intra or back-arc extension.
学科主题	构造地质学
WOS关键词	ARC/BACK-ARC ASSEMBLAGES ; PLATE IGNEOUS ROCKS ; U-PB GEOCHRONOLOGY ; SOUTHWEST CHINA ; SW CHINA ; GEOLOGICAL SIGNIFICANCES ; CRUSTAL STRUCTURE ; BASIN DEVELOPMENT ; VOLCANIC-ROCKS ; TETHYS OROGEN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	This study was financially supported by State Key Research Development;Programs of China (973; 2009CB421001 and 2011CB808901) and a program of;the Geological Survey of China (1212010818096). Frank Mattern, A. Reid,;Paul Kapp, and two anonymous reviewers provided thoughtful comments and;suggestions on versions of this paper. We owe special thanks to the;Editor, Onno Oncken, and acknowledge his tremendous patience.
WOS记录号	WOS:000306227100002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39769]
专题	中国地质调查局
作者单位	1.CAGS, Inst Geol, Beijing 100037, Peoples R China. 2.China Univ Geosci, Geol Labs Ctr, Beijing, Peoples R China. 3.China Univ Geosci, Dept Geol, Beijing, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Yang, T. -N.,Hou, Z-Q.,Wang, Y.,et al. Late Paleozoic to Early Mesozoic tectonic evolution of northeast Tibet:;Evidence from the Triassic composite western Jinsha-Garze-Litang suture[J]. TECTONICS,2012,31;AR TC4004:-.
APA	Yang, T. -N.,Hou, Z-Q.,Wang, Y.,Zhang, H. -R.,&Wang, Z. -L..(2012).Late Paleozoic to Early Mesozoic tectonic evolution of northeast Tibet:;Evidence from the Triassic composite western Jinsha-Garze-Litang suture.TECTONICS,31;AR TC4004,-.
MLA	Yang, T. -N.,et al."Late Paleozoic to Early Mesozoic tectonic evolution of northeast Tibet:;Evidence from the Triassic composite western Jinsha-Garze-Litang suture".TECTONICS 31;AR TC4004(2012):-.