Tectonic Evolution of the Amdo Terrane, Central Tibet: Petrochemistry and Zircon U-Pb Geochronology

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	Tectonic Evolution of the Amdo Terrane, Central Tibet: Petrochemistry and Zircon U-Pb Geochronology
	Zhang, ZM (Zhang, Ze-Ming)5; Dong, X (Dong, Xin); Liu, F (Liu, Feng); Lin, YH (Lin, Yan-Hao); Yan, R (Yan, Rong); Santosh, M (Santosh, M.)
刊名	JOURNAL OF GEOLOGY
	2012
卷号	120 期号:4 页码:431-451
ISSN号	0022-1376
英文摘要	The formation and evolution of the basement rocks in the Tibetan Plateau remain poorly constrained. Here we report petrology, geochemistry, and zircon U-Pb geochronology of orthogneisses, metamafic intrusions, and metasedimentary rocks from the Amdo basement in central Tibet. The oldest Neoproterozoic (similar to 820 Ma) orthogneisses show chemical affinity to a volcanic arc setting. These rocks, together with the coeval arc-magmatic rocks, belong to an Andean-type setting traced from the Seychelles, Madagascar, western India, Lhasa, and South China blocks, following the Rodinia supercontinent assembly. The later early Paleozoic (similar to 500 Ma) bimodal intrusions in Amdo also show an affinity to arc-related igneous rocks and probably formed in an active continental margin associated with the subduction of the Proto-Tethys Ocean beneath the Gondwana supercontinent. In contrast to the adjacent Lhasa and Qiangtang terranes, the Amdo block experienced complex Neoproterozoic and early Paleozoic tectono-thermal events and coherent Jurassic (similar to 190 Ma) high-pressure granulite-facies metamorphism and associated magmatism, suggesting that the Amdo block was an isolated microcontinent in the Tethyan Ocean and underwent deep subduction before its collision with the Qiangtang or Lhasa terrane.
学科主题	构造地质学
WOS关键词	EASTERN HIMALAYAN SYNTAXIS ; EARLY PALEOZOIC TECTONISM ; HIGH-PRESSURE GRANULITES ; BENEATH SOUTHERN TIBET ; CONTINENTAL COLLISION ; LHASA TERRANE ; CENTRAL NEPAL ; PAN-AFRICAN ; BREAK-UP ; METAMORPHIC EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	UNIV CHICAGO PRESS
WOS记录号	WOS:000305752500005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39746]
专题	中国地质调查局
作者单位	1.[Zhang, Ze-Ming 2.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China [Liu, Feng 3.Lin, Yan-Hao 4.Kochi Univ, Fac Sci, Div Interdisciplinary Sci, Kochi 7808520, Japan 5.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, ZM ,Dong, X ,Liu, F ,et al. Tectonic Evolution of the Amdo Terrane, Central Tibet: Petrochemistry and Zircon U-Pb Geochronology[J]. JOURNAL OF GEOLOGY,2012,120(4):431-451.
APA	Zhang, ZM ,Dong, X ,Liu, F ,Lin, YH ,Yan, R ,&Santosh, M .(2012).Tectonic Evolution of the Amdo Terrane, Central Tibet: Petrochemistry and Zircon U-Pb Geochronology.JOURNAL OF GEOLOGY,120(4),431-451.
MLA	Zhang, ZM ,et al."Tectonic Evolution of the Amdo Terrane, Central Tibet: Petrochemistry and Zircon U-Pb Geochronology".JOURNAL OF GEOLOGY 120.4(2012):431-451.