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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-Long1; Zeng, Lu1,2; Wang, Yang1; Tang, Xian-Chun3
Corresponding AuthorTang, Xian-Chun(tangxianchun@cags.ac.cn)
2019-07-02
Source PublicationGEOLOGICAL JOURNAL
ISSN0072-1050
Pages15
AbstractFifteen 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.
Keywordgeochemistry mantle plume Meso-Tethys Permian rifting siliciclastic rocks Tibet
DOI10.1002/gj.3564
Indexed BySCI
WOS KeywordNORTHERN TIBET ; TECTONIC EVOLUTION ; CRUSTAL EVOLUTION ; SEDIMENTARY-ROCKS ; PROVENANCE ; CONSTRAINTS ; GONDWANALAND ; TURBIDITES ; MAGMATISM ; TERRANE
Language英语
Funding ProjectChina Geology Survey[DD20190132] ; National Natural Science Foundation of China[41877197] ; National Natural Science Foundation of China[41602257]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000475826800001
Funding OrganizationChina Geology Survey ; National Natural Science Foundation of China
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/26776
Collection中国科学院水利部成都山地灾害与环境研究所
Corresponding AuthorTang, Xian-Chun
Affiliation1.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
Recommended Citation
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.
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