Two constrasting magmatic events in the Dulan UHP metamorphic terrane: Implication for collisional orogeny

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	Two constrasting magmatic events in the Dulan UHP metamorphic terrane: Implication for collisional orogeny
	Yu, SY (Yu ShengYao); Zhang, JX (Zhang JianXin); Hou, KJ (Hou KeJun)
刊名	ACTA PETROLOGICA SINICA
	2011
卷号	27 期号:11 特刊 SI 页码:3335-3349
关键词	Tectonothermal event Zircon U-Ph dating Hf isotope Dulan North Qaidarn Mountains
ISSN号	1000-0569
英文摘要	In this article, we report the geochemical, zircon U-Pb dating and Hf isotopic data for tonalite and granite from Dulan area, the North Qaidam Mountains. Zircon U-Pb dating result indicates that the tonalite was emplaced at 432 similar to 434Ma, which shows a geochemical resemblance to adakite; (1) high SiO(2), enriched in Na(2)O and depleted in K(2)O, and peraluminous; (2) high Sr and low Y, and thus corresponding to high Sr/Y; (3) high La/Yb amd low Yb; (4) depleted in HREE, and thus strongly partition between HREE and LREE; (5) enriched in LILE including Ba and Sr, depleted in HFSE such as Nb and Ta. In combination with the high epsilon(Hf)(t) values (3. 3 similar to 10.7) and young crustal model age of 732 similar to 1207Ma, the tonalite was suggested to derived from partial melting of thickened basaltic lower crust. Zircon U-Pb dating result indicates that the granite was emplaced at 382 similar to 391 Ma, and the granite shows geochemical character similar to S-type granite as followings; (1) high SiO(2) and K(2)O, and low MgO, with K(2)O/Na(2)O values greater than 1. 0; (2) peraluminous with A/CNK greater than 1. 0; (3) slightly partition between LREE and HREE (La/Yb)(N) = 2. 22 similar to 9. 62), with negative Eu anomalies ranging from 0. 27 to 0. 81; (4) strongly depleted in Nb, Ta, Sr and Ti, and slightly depleted in Ba. On the basis of the age interval between granite and HP/UHP metamorphic event, in combination with the geochemical characteristic, the granite was suggested to derive from the partial melting of its country rock Al-rich gneiss with input of minor mantle material in post - collisional extension stage.
学科主题	变质岩岩石学
WOS关键词	NORTHERN TIBETAN PLATEAU ; QAIDAM HP/UHP TERRANE ; NATURAL REFERENCE MATERIAL ; EARLY CONTINENTAL-CRUST ; U-PB ; NW CHINA ; WESTERN CHINA ; TRACE-ELEMENT ; GARNET PERIDOTITE ; OCEANIC-CRUST
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000297822900015
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39345]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Yu, SY ,Zhang, JX ,Hou, KJ . Two constrasting magmatic events in the Dulan UHP metamorphic terrane: Implication for collisional orogeny[J]. ACTA PETROLOGICA SINICA,2011,27(11 特刊 SI):3335-3349.
APA	Yu, SY ,Zhang, JX ,&Hou, KJ .(2011).Two constrasting magmatic events in the Dulan UHP metamorphic terrane: Implication for collisional orogeny.ACTA PETROLOGICA SINICA,27(11 特刊 SI),3335-3349.
MLA	Yu, SY ,et al."Two constrasting magmatic events in the Dulan UHP metamorphic terrane: Implication for collisional orogeny".ACTA PETROLOGICA SINICA 27.11 特刊 SI(2011):3335-3349.