Geochronology, geochemistry, and Nd isotopes of early Mesozoic bimodal volcanism in northern Tibet, western China: Constraints on the exhumation of the central Qiangtang metamorphic belt

doi:10.1016/j.lithos.2010.10.015

	Geochronology, geochemistry, and Nd isotopes of early Mesozoic bimodal volcanism in northern Tibet, western China: Constraints on the exhumation of the central Qiangtang metamorphic belt
	Zhang, Kai-Jun 1,2; Tang, Xian-Chun 2,3; Wang, Yang 3,4; Zhang, Yu-Xiu 3,5,6
刊名	LITHOS
	2011
卷号	121 期号:1-4 页码:167-175
关键词	Bimodal volcanism Qiangtang Tibetan plateau Exhumation Geochronology Geochemistry Nd isotopes
ISSN号	0024-4937
DOI	10.1016/j.lithos.2010.10.015
文献子类	Article
英文摘要	Geochronological (sensitive high-resolution ion microprobe, SHRIMP II, and Ar-40/Ar-39), major and trace element, and Nd isotopic data are presented for newly discovered early Mesozoic volcanic rocks in and around the central Qiangtang metamorphic belt on the northern Tibetan Plateau. The data indicate that volcanism/magmatism was active during the Triassic and Jurassic and show a bimodal composition. Mafic lavas are generally similar to oceanic island basalt, characterized by enrichments in Nb and Ta relative to similarly incompatible elements, high rare earth element (REE) concentrations, enrichment in light REEs, absence of Eu anomalies, and positive epsilon(Nd) values. Felsic lavas are characterized by enrichment in large ion lithophile elements and light REEs, depletion in high field strength elements (especially for Nb and P), and very low epsilon(Nd) values (<-10). The trace element and isotopic data suggest that the felsic lavas were derived from partial melting of the continental crust. The volcanism was caused by post-orogenic collapse of the central Qiangtang metamorphic belt due to break-off of the subducting western Qiangtang slab, which may have induced decompressional melting that resulted in the eruption of small volumes of basaltic rocks and the relatively rapid exhumation of high-pressure to ultrahigh-pressure rocks. (C) 2010 Elsevier B.V. All rights reserved.
WOS关键词	DEEP-CRUSTAL STRUCTURE ; CONTINENTAL SUBDUCTION ; TECTONIC IMPLICATIONS ; CORE COMPLEXES ; FLOOD BASALTS ; EVOLUTION ; ROCKS ; BLOCK ; DISCRIMINATION ; PROVENANCE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000286541300012
资助机构	CAS ; CAS ; CAS ; CAS ; CAS ; CAS ; CAS ; CAS
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/74402]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Kai-Jun
作者单位	1.Nanjing Univ, Dept Earth Sci, Asian Tecton Res Grp, Nanjing 210093, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100008, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100008, Peoples R China 5.China Univ Geosci, Res Ctr Tibetan Plateau Geol, Beijing 100083, Peoples R China 6.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Kai-Jun,Tang, Xian-Chun,Wang, Yang,et al. Geochronology, geochemistry, and Nd isotopes of early Mesozoic bimodal volcanism in northern Tibet, western China: Constraints on the exhumation of the central Qiangtang metamorphic belt[J]. LITHOS,2011,121(1-4):167-175.
APA	Zhang, Kai-Jun,Tang, Xian-Chun,Wang, Yang,&Zhang, Yu-Xiu.(2011).Geochronology, geochemistry, and Nd isotopes of early Mesozoic bimodal volcanism in northern Tibet, western China: Constraints on the exhumation of the central Qiangtang metamorphic belt.LITHOS,121(1-4),167-175.
MLA	Zhang, Kai-Jun,et al."Geochronology, geochemistry, and Nd isotopes of early Mesozoic bimodal volcanism in northern Tibet, western China: Constraints on the exhumation of the central Qiangtang metamorphic belt".LITHOS 121.1-4(2011):167-175.