Opening of the Longmu Co-Shuanghu-Lancangjiang ocean: constraints from plagiogranites

doi:10.1007/s11434-014-0434-z

	Opening of the Longmu Co-Shuanghu-Lancangjiang ocean: constraints from plagiogranites
	Hu, Peiyuan 1; Li, Cai 1; Wu, Yanwang 1; Xie, Chaoming 1; Wang, Ming 1; Li, Jiao 2
刊名	CHINESE SCIENCE BULLETIN
	2014-09-01
卷号	59 期号:25 页码:3188-3199
关键词	Tibetan Plateau Qiangtang Longmu Co-Shuanghu-Lancangjiang ocean Cambrian ophiolite Plagiogranite
ISSN号	1001-6538
DOI	10.1007/s11434-014-0434-z
文献子类	Article
英文摘要	This paper reports new zircon U-Pb ages, and Hf isotope and whole-rock major and trace element data for Cambrian plagiogranites from the Tuobeiling ophiolite in central Qiangtang, Tibetan Plateau. Zircon SIMS and LA-ICP-MS U-Pb dating of the plagiogranites yield weighted mean ages of 504.8 +/- A 4.2 and 491.6 +/- A 1.5 Ma, respectively. The zircons from plagiogranites exhibit positive epsilon (Hf)(t) values (ranging from 11.46 to 15.16), indicating that the plagiogranites are derived from depleted mantle. These plagiogranites are characterized by high SiO2 and Na2O, low K2O, low REE contents, and flat REE distribution patterns. These rocks have geochemical compositions typical of oceanic plagiogranite and, considered along with their petrography and field relationships, are interpreted to have derived from anatexis of hydrated amphibolites by ductile shearing during transports of the oceanic crust. The formation age of such type of plagiogranite is slightly younger than that of the associated section of oceanic crust. Thus the new results from these plagiogranites suggest that the Longmu Co-Shuanghu-Lancangjiang ocean had probably opened before the Middle Cambrian.
WOS关键词	U-PB GEOCHRONOLOGY ; NORTHERN TIBET ; ISOTOPIC CHARACTERISTICS ; QIANGTANG BLOCK ; OPHIOLITE ; ZIRCON ; COMPLEX ; ARC ; GEOCHEMISTRY ; SUBDUCTION
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000339400500014
资助机构	National Natural Science Foundation of China(41072166 ; National Natural Science Foundation of China(41072166 ; 41272240) ; 41272240) ; National Natural Science Foundation of China(41072166 ; National Natural Science Foundation of China(41072166 ; 41272240) ; 41272240) ; National Natural Science Foundation of China(41072166 ; National Natural Science Foundation of China(41072166 ; 41272240) ; 41272240) ; National Natural Science Foundation of China(41072166 ; National Natural Science Foundation of China(41072166 ; 41272240) ; 41272240)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84974]
专题	中国科学院地质与地球物理研究所
通讯作者	Li, Cai
作者单位	1.Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Hu, Peiyuan,Li, Cai,Wu, Yanwang,et al. Opening of the Longmu Co-Shuanghu-Lancangjiang ocean: constraints from plagiogranites[J]. CHINESE SCIENCE BULLETIN,2014,59(25):3188-3199.
APA	Hu, Peiyuan,Li, Cai,Wu, Yanwang,Xie, Chaoming,Wang, Ming,&Li, Jiao.(2014).Opening of the Longmu Co-Shuanghu-Lancangjiang ocean: constraints from plagiogranites.CHINESE SCIENCE BULLETIN,59(25),3188-3199.
MLA	Hu, Peiyuan,et al."Opening of the Longmu Co-Shuanghu-Lancangjiang ocean: constraints from plagiogranites".CHINESE SCIENCE BULLETIN 59.25(2014):3188-3199.