Tracing the 850-Ma continental flood basalts from a piece of subducted continental crust in the North Qaidam UHPM belt, NW China

doi:10.1016/j.precamres.2010.09.008

	Tracing the 850-Ma continental flood basalts from a piece of subducted continental crust in the North Qaidam UHPM belt, NW China
	Song, Shuguang 1; Su, Li 2; Li, Xian-hua 3; Zhang, Guibing 1; Niu, Yaoling 4; Zhang, Lifei 1
刊名	PRECAMBRIAN RESEARCH
	2010-12-15
卷号	183 期号:4 页码:805-816
关键词	Eclogite blocks CFB Zircon U-Pb age 850 Ma mantle plume North Qaidam UHP belt Continental subduction
ISSN号	0301-9268
DOI	10.1016/j.precamres.2010.09.008
文献子类	Article
英文摘要	A Paleozoic ultrahigh-pressure metamorphic (UHPM) belt extends along the northern margin of the Qaidam Basin, North Tibetan Plateau. Eclogites in the Yuka eclogite terrane, northwest part of this UHPM belt, occur as blocks or layers of varying size intercalated with granitic and pelitic gneisses. These eclogites have protoliths geochemically similar to enriched-type mid-ocean ridge basalts (E-MORB) and oceanic island basalts (OW). On the basis of Ti/Y ratios, they can be divided into low-Ti and high-Ti groups. The low-Ti group (LTG) eclogites exhibit relatively low TiO(2) (most <2.5 wt%) and Ti/Y (<500) but comparatively high Mg# (48-55), whereas the high-Ti group (HTG) eclogites have high TiO(2) (most >2.5 wt%) and Ti/Y (>500) but lower Mg# (46-52). Zircons from two eclogite samples gave a magmatic crystallization (protolith) age of similar to 850 Ma and a UHPM age of similar to 433 Ma. The occurrence, geochemical features and age data of the Yuka eclogites suggest that their protoliths are segments of continental flood basalts (CFBs) with a mantle plume origin, similar to most typical CFBs. Our observation, together with the tectonic history and regional geologic context, lend support for the large scale onset of mantle plume within the Rodinia supercontinent at similar to 850 Ma. The Qaidam block is probably one of the fragments of the Rodinia supercontinent with a volcanic-rifted passive margin. The latter may have been dragged to mantle depths by its subducting leading edge of the oceanic lithosphere in the Early Paleozoic. (C) 2010 Elsevier B.V. All rights reserved.
WOS关键词	PRESSURE METAMORPHIC BELT ; U-PB ZIRCON ; SOUTH CHINA ; WESTERN CHINA ; MANTLE PLUME ; BREAK-UP ; GARNET PERIDOTITE ; TIBETAN PLATEAU ; GEOCHEMICAL CONSTRAINTS ; ISOTOPIC CONSTRAINTS
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000285531100009
资助机构	Major State Basic Research Development Projects(2009CB825007) ; Major State Basic Research Development Projects(2009CB825007) ; National Natural Science Foundation of China(40825007 ; National Natural Science Foundation of China(40825007 ; 40773012 ; 40773012 ; 40821002 ; 40821002 ; 40802016) ; 40802016) ; Major State Basic Research Development Projects(2009CB825007) ; Major State Basic Research Development Projects(2009CB825007) ; National Natural Science Foundation of China(40825007 ; National Natural Science Foundation of China(40825007 ; 40773012 ; 40773012 ; 40821002 ; 40821002 ; 40802016) ; 40802016) ; Major State Basic Research Development Projects(2009CB825007) ; Major State Basic Research Development Projects(2009CB825007) ; National Natural Science Foundation of China(40825007 ; National Natural Science Foundation of China(40825007 ; 40773012 ; 40773012 ; 40821002 ; 40821002 ; 40802016) ; 40802016) ; Major State Basic Research Development Projects(2009CB825007) ; Major State Basic Research Development Projects(2009CB825007) ; National Natural Science Foundation of China(40825007 ; National Natural Science Foundation of China(40825007 ; 40773012 ; 40773012 ; 40821002 ; 40821002 ; 40802016) ; 40802016)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/72000]
专题	中国科学院地质与地球物理研究所
通讯作者	Song, Shuguang
作者单位	1.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.China Univ Geosci, Geol Lab Ctr, Beijing 100083, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
推荐引用方式 GB/T 7714	Song, Shuguang,Su, Li,Li, Xian-hua,et al. Tracing the 850-Ma continental flood basalts from a piece of subducted continental crust in the North Qaidam UHPM belt, NW China[J]. PRECAMBRIAN RESEARCH,2010,183(4):805-816.
APA	Song, Shuguang,Su, Li,Li, Xian-hua,Zhang, Guibing,Niu, Yaoling,&Zhang, Lifei.(2010).Tracing the 850-Ma continental flood basalts from a piece of subducted continental crust in the North Qaidam UHPM belt, NW China.PRECAMBRIAN RESEARCH,183(4),805-816.
MLA	Song, Shuguang,et al."Tracing the 850-Ma continental flood basalts from a piece of subducted continental crust in the North Qaidam UHPM belt, NW China".PRECAMBRIAN RESEARCH 183.4(2010):805-816.