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	Geochemistry and dating of e-morb type mafic rocks from dalabute ophiolite in west junggar, xinjiang and geological implications
	Liu XiJun1,2; Xu JiFeng1; Wang ShuQing1; Hou QingYe1,3; Bai ZhengHua1; Lei Min3
刊名	Acta petrologica sinica
	2009-06-01
卷号	25期号:6页码:1373-1389
关键词	Junggar Dalabute Ophiolite E-morb La-icp-ms
ISSN号	1000-0569
通讯作者	Liu xijun(xijunliu@gig.ac.cn)
英文摘要	The west junggar region in northwestern china is an important part of central asian orogenic belt, which consists of successive subduction-accretion of ophiolites, island arc, oceanic ialands, seamounts, accretionary wedges in paleozoic. a number of ophiolites or ophiolitic melanges were emplaced within this orogenic belt, dalabute ophiolite, which is one of the largest ophiolite belts in west junggar, represents the remnants of paleoasian oceanic crust. geochemically, the mafic rocks of dalabute ophiolite display normal mid-ocean ridge basalt ( n-morb), enriched mid-ocean ridge basalt (e-morb) and ocean island basalt ( 0113) signatures. this paper reports that the la-icp-ms zircon u-pb dating result for e-morb type leucocratic gabbros from akebasitao terrane of dalabute ophiolite, yielding an age of 302 +/- 1. 7ma. since the more complexity petrogenesis of e-morb and oib mafic rocks in ophiolites, combining previous studies, we propose two hypotheses for explanation of gabbro age: (1) e-morb and oib type mafic rocks were formed in late stage of back arc extension, the dating represents the formation age of the ophiolite, suggesting the junggar ocean possibly closed after late carboniferous; (2) e-morb and oib type mafic rocks were forearc seamount in accretionary prism (luring the death or emplacement stage of ophiolite, which formed in response to collision of spreading center with dulabute ophiolite subduction zone. they post-dated formation of main ophiolite sequence, but have significant tectonic implications for the origin and evolution of the dalabute ophiolite. we favor the latter explanation and propose that there was an active margin during the late carboniferous-early permian in north xinjiang. the important cause of tectonic-magmatic-metallogenic-orogenic climax is the subduction of spreading center, by which the large volume of continental crust increased through transfer granitic melt, which were from partial melting of accretionary wedge, subducted slab and recycled sediments triggered by, underplating of mantle-derived basaltic magmas, to orogenic belt. this process may he caused by slab window effects following spreading center subduction.
WOS关键词	CARBONIFEROUS VOLCANIC-ROCKS ; PLASMA-MASS SPECTROMETRY ; TRACE-ELEMENT EVIDENCE ; ASIAN OROGENIC BELT ; ND ISOTOPE EVIDENCE ; EAST SCOTIA RIDGE ; BACK-ARC BASIN ; U-PB AGE ; NW CHINA ; TECTONIC EVOLUTION
WOS研究方向	Geology
WOS类目	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000267571400009
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2395102
专题	中国科学院大学
通讯作者	Liu XiJun
作者单位	1.Chinese Acad Sci, Key Lab Isotope Geochronol & Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China 3.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Liu XiJun,Xu JiFeng,Wang ShuQing,et al. Geochemistry and dating of e-morb type mafic rocks from dalabute ophiolite in west junggar, xinjiang and geological implications[J]. Acta petrologica sinica,2009,25(6):1373-1389.
APA	Liu XiJun,Xu JiFeng,Wang ShuQing,Hou QingYe,Bai ZhengHua,&Lei Min.(2009).Geochemistry and dating of e-morb type mafic rocks from dalabute ophiolite in west junggar, xinjiang and geological implications.Acta petrologica sinica,25(6),1373-1389.
MLA	Liu XiJun,et al."Geochemistry and dating of e-morb type mafic rocks from dalabute ophiolite in west junggar, xinjiang and geological implications".Acta petrologica sinica 25.6(2009):1373-1389.

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