Chronology and Geochemistry of the Nadingcuo Volcanic Rocks in the Southern Qiangtang Region of the Tibetan Plateau Partial Melting of Remnant Ocean Crust along the Bangong-Nujiang Suture

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	Chronology and Geochemistry of the Nadingcuo Volcanic Rocks in the Southern Qiangtang Region of the Tibetan Plateau Partial Melting of Remnant Ocean Crust along the Bangong-Nujiang Suture
	Wang, BD (Wang Baodi); Chen, JL (Chen Jianlin); Xu, JF (Xu Jifeng); Wang, LQ (Wang Liquan); Zeng, QG (Zeng Qinggao); Dong, YH (Dong Yanhui)
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2010
卷号	84 期号:6 页码:1461-1473
关键词	intracontinental subduction adakitic rocks remnant oceanic crust Nadingcuo Qiangtang Tibetan plateau
ISSN号	1000-9515
英文摘要	The Nadingcuo high-K calc-alkaline rocks mainly composed of trachyte and trachyandesite are the largest outcrop area of volcanic rocks in southern Qiangtang terrane in the Tibetan plateau. However, their exact source and peterogenesis are still debated. 40Ar-39Ar and LAM-ICPMS zircon U-Pb isotopic dating confirm that these rocks erupted in Eocene. In addition, the Nadingcuo volcanic rocks are characterized by high Sr/Y content ratios, similar with the adakite derived from partial melting of oceanic crust. They can be further classified as high Mg# (Mg# = 48-57) and low Mg# (Mg# = 33-42) subtypes. The Nadingcuo adakitic rocks have relatively low (87Sr/86Sr)(i) and high epsilon(Nd)(t), showing a trend of similarity to the Dongcuo ophiolite present in the Bangong-Nujiang oceanic crust. Simple modeling indicates that the Nadingcuo adakitic rocks are a mix resulting from the basalt of Bangong-Nujiang Ocean with 10%-20% crustal material of Lhasa terrane. On these bases we suggest that the low Mg# Nadingcuo adakitic rocks are the product of partial melting of remnant oceanic crust with small sediment, and the high Mg# rocks are the result of reaction between rising melt of remnant oceanic crust with subducted sediment and mantle wedge. Therefore, the origin of Nadingcuo adakitic rocks may be related to intracontinental subduction triggered by collision of India-Asia during Cenozoic.
学科主题	火成岩岩石学
WOS关键词	MANTLE SOURCE CHARACTERISTICS ; LOWER CONTINENTAL-CRUST ; EAST-WEST EXTENSION ; HIGH MG-NUMBER ; SE CHINA ; THERMAL EVOLUTION ; TRACE-ELEMENTS ; SUBDUCTED SLAB ; COPPER BELT ; COLLISION
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL PUBLISHING, INC
WOS记录号	WOS:000285753000013
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39111]
专题	中国地质调查局
作者单位	SOA, Inst Oceang 2, Hangzhou 310012, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Wang, BD ,Chen, JL ,Xu, JF ,et al. Chronology and Geochemistry of the Nadingcuo Volcanic Rocks in the Southern Qiangtang Region of the Tibetan Plateau Partial Melting of Remnant Ocean Crust along the Bangong-Nujiang Suture[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2010,84(6):1461-1473.
APA	Wang, BD ,Chen, JL ,Xu, JF ,Wang, LQ ,Zeng, QG ,&Dong, YH .(2010).Chronology and Geochemistry of the Nadingcuo Volcanic Rocks in the Southern Qiangtang Region of the Tibetan Plateau Partial Melting of Remnant Ocean Crust along the Bangong-Nujiang Suture.ACTA GEOLOGICA SINICA-ENGLISH EDITION,84(6),1461-1473.
MLA	Wang, BD ,et al."Chronology and Geochemistry of the Nadingcuo Volcanic Rocks in the Southern Qiangtang Region of the Tibetan Plateau Partial Melting of Remnant Ocean Crust along the Bangong-Nujiang Suture".ACTA GEOLOGICA SINICA-ENGLISH EDITION 84.6(2010):1461-1473.