Protoliths and tectonic implications of the newly discovered Triassic Baqing eclogites, central Tibet: Evidence from geochemistry, Sr-Nd isotopes and geochronology

doi:10.1016/j.gr.2018.12.011

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	Protoliths and tectonic implications of the newly discovered Triassic Baqing eclogites, central Tibet: Evidence from geochemistry, Sr-Nd isotopes and geochronology
	Jin, Xin 6; Zhang, Yu-Xiu 5,6; Zhou, Xiao-Yao 6; Zhang, Kai Jun 5,6; Li, Zhi-Wu 4; Bin Khalid, Shahbaz 6; Hu, Jun-Cheng 6; Lu, Lu 3; Sun, Wei-Dong1,2
刊名	GONDWANA RESEARCH
	2019-05-01
卷号	69 页码:144-162
关键词	Eclogite Protolith Backarc basin Geochemistry Qiangtang Paleo-Tethys
ISSN号	1342-937X
DOI	10.1016/j.gr.2018.12.011
通讯作者	Zhang, Yu-Xiu(zhangyuxiou@ucas.ac.cn)
英文摘要	Geochemical, Sr-Nd isotopic and geochronological methods were used to reveal the protoliths and geodynamic implications of the newly discovered Triassic Baqing eclogites, eastern Qiangtang terrane, central Tibet. We assessed the mobility of trace elements, and it turned out that high field strength elements (HFSEs) and rare earth elements (REEs) were immobile in the high-pressure (HP) metamorphic process and reliably employed to discriminate the protoliths of the Baqing eclogites. Whole-rock geochemical data (especially immobile elements) suggested both arc-related (negative Nb-Ta anomalies, high light (L) REEs/heavy (H) REEs ratios) and mid-oceanic ridge basalt (MORB)-related (without negative Nb-Ta anomalies, relatively low REEs contents) characteristics, indicating the contribution of different proportions of subduction material with a backarc basin origin. According to the Sr-Nd isotopic ratios (initial Sr-87/Sr-86 ratios: 0.7078-0.7086; epsilon(Nd)(t) values: -0.58 to +1.96), the protoliths of the Baqing eclogites originated from mantle which experienced continental crustal contamination in the subduction zone. Compared with nearby subduction-related magmatic rocks from eastern Qiangtang terrane, backarc basin was the most likely tectonic environment for the Baqing eclogite protoliths. The Jinsha Paleo-Tethyan Ocean southward subduction underneath East Qiangtang block (EQB) and rollback led to the formation of this backarc basin between the Late Permian and Early Triassic, and subsequent northward subduction of the backarc basin formed the Baqing eclogites in early Late Triassic (227-221 Ma). (C) 2019 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China, China[41472209] ; National Natural Science Foundation of China, China[40802048] ; National Natural Science Foundation of China, China[41877197] ; National Natural Science Foundation of China, China[41602257] ; President Fund for Science and Education Fusion of University of Chinese Academy of Sciences, China[Y552011Y00] ; China Geological Survey, China[DD2016008003] ; China Geological Survey, China[DD20160015] ; China Geological Survey, China[12120113033004] ; China Geological Survey, China[1212011086065]
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000486979400009
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/162947]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Zhang, Yu-Xiu
作者单位	1.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China 3.China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Jiangsu, Peoples R China 4.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu, Sichuan, Peoples R China 5.Chinese Acad Sci, Key Lab Computat Geodynam, 19A Yuquan Rd, Beijing 100049, Peoples R China 6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Jin, Xin,Zhang, Yu-Xiu,Zhou, Xiao-Yao,et al. Protoliths and tectonic implications of the newly discovered Triassic Baqing eclogites, central Tibet: Evidence from geochemistry, Sr-Nd isotopes and geochronology[J]. GONDWANA RESEARCH,2019,69:144-162.
APA	Jin, Xin.,Zhang, Yu-Xiu.,Zhou, Xiao-Yao.,Zhang, Kai Jun.,Li, Zhi-Wu.,...&Sun, Wei-Dong.(2019).Protoliths and tectonic implications of the newly discovered Triassic Baqing eclogites, central Tibet: Evidence from geochemistry, Sr-Nd isotopes and geochronology.GONDWANA RESEARCH,69,144-162.
MLA	Jin, Xin,et al."Protoliths and tectonic implications of the newly discovered Triassic Baqing eclogites, central Tibet: Evidence from geochemistry, Sr-Nd isotopes and geochronology".GONDWANA RESEARCH 69(2019):144-162.