Geochemistry and Nd isotopes of Lower Permian siliciclastic rocks from central Tibet, western China: Evidence for Early Permian initiation of the rifting between the Lhasa and Qiangtang blocks?

doi:10.1002/gj.3564

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所

	Geochemistry and Nd isotopes of Lower Permian siliciclastic rocks from central Tibet, western China: Evidence for Early Permian initiation of the rifting between the Lhasa and Qiangtang blocks?
	Yan, Li-Long 1; Zeng, Lu 1,2; Wang, Yang1 ; Tang, Xian-Chun 3
刊名	GEOLOGICAL JOURNAL
	2019-07-02
页码	15
关键词	geochemistry mantle plume Meso-Tethys Permian rifting siliciclastic rocks Tibet
ISSN号	0072-1050
DOI	10.1002/gj.3564
通讯作者	Tang, Xian-Chun(tangxianchun@cags.ac.cn)
英文摘要	Fifteen Lower Permian siliciclastic rocks from central Tibet were analysed for the major and trace elements, and ten samples among them were chosen for determination of Nd isotopic compositions. They are characterized by low concentrations of SiO2 and low ratios of SiO2/Al2O3, moderate abundances of Fe2O3 + MgO (mudstones, 7.28-9.72 wt.%; sandstones, 4.62-10.02 wt.%) and TiO2 (mudstones, 0.55-0.95 wt.%; sandstones, 0.53-0.99 wt.%), significant enrichments of light rare-earth elements (LREEs) relative to the heavy REEs (HREEs; average (La/Yb)(N) = 9.8 [mudstones] and 9.48 [sandstones]), flat HREE distribution, obvious negative Eu anomalies (average Eu/Eu* = 0.68), higher Th/Sc and La/Sc ratios, and negative initial epsilon(Nd) values (on average -7.2 and -8.5 for sandstones and mudstones, respectively). The mixing modal analysis based on some elemental pairs and Nd isotopic composition, respectively, Nd depleted mantle model age (T-DM) and initial epsilon(Nd) values, uniformly indicates that about 30-40% mafic materials could have been added into these sedimentary rocks. These siliciclastic rocks could have formed in a setting of rifting between the Lhasa and Qiangtang blocks, when a 280 Ma mantle plume upwelling event was occurring in northern Gondwana.
资助项目	China Geology Survey[DD20190132] ; National Natural Science Foundation of China[41877197] ; National Natural Science Foundation of China[41602257]
WOS关键词	NORTHERN TIBET ; TECTONIC EVOLUTION ; CRUSTAL EVOLUTION ; SEDIMENTARY-ROCKS ; PROVENANCE ; CONSTRAINTS ; GONDWANALAND ; TURBIDITES ; MAGMATISM ; TERRANE
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000475826800001
资助机构	China Geology Survey ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/26776]
专题	中国科学院水利部成都山地灾害与环境研究所
通讯作者	Tang, Xian-Chun
作者单位	1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Key Lab Computat Geodynam, Asian Tecton Res Grp, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Sichuan, Peoples R China 3.Chinese Acad Geol Sci, SinoProbe Ctr, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Yan, Li-Long,Zeng, Lu,Wang, Yang,et al. Geochemistry and Nd isotopes of Lower Permian siliciclastic rocks from central Tibet, western China: Evidence for Early Permian initiation of the rifting between the Lhasa and Qiangtang blocks?[J]. GEOLOGICAL JOURNAL,2019:15.
APA	Yan, Li-Long,Zeng, Lu,Wang, Yang,&Tang, Xian-Chun.(2019).Geochemistry and Nd isotopes of Lower Permian siliciclastic rocks from central Tibet, western China: Evidence for Early Permian initiation of the rifting between the Lhasa and Qiangtang blocks?.GEOLOGICAL JOURNAL,15.
MLA	Yan, Li-Long,et al."Geochemistry and Nd isotopes of Lower Permian siliciclastic rocks from central Tibet, western China: Evidence for Early Permian initiation of the rifting between the Lhasa and Qiangtang blocks?".GEOLOGICAL JOURNAL (2019):15.