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Geochronology and geochemistry of the fossil-flora-bearing Wuda Tuff in North China Craton and its tectonic implications
Wang, Man1,2; Zhong, Yu-ting1; He, Bin1; Denyszyn, Steven W.3; Wang, Jun (王军)2,4; Xu, Yi-gang1,2,5
2020-07-01
Source PublicationLITHOS
ISSN0024-4937
Volume364Pages:10
Abstract

The Wuda Tuff Flora in the North China Craton (NCC) is a "vegetational Pompeii" and one of the most completely preserved marsh ecosystems of the late Paleozoic Northern Hemisphere. However, the precise age, geochemistry, and petrogenesis of the thick tuff containing this peat-forming flora have not been established. We conducted a comprehensive petrographic, mineralogical, whole-rock geochemical, and zircon U-Pb and Hf-O isotopic investigation of five samples from a vertical section through the tuff bed. Our results confirm that the material that buried the flora is a volcanic tuff bed that has undergone intensive post-deposition alteration. Whole-rock Al2O3/TiO2 ratios (65.8-103.5) and negative Eu/Eu* values (0.27-038) further suggest a felsic volcanic origin. Secondary ion mass spectrometry zircon U-Pb dating of the altered tuff bed yielded a weighted mean Pb-206/U-238 age of 295.9 +/- 1.4 Ma (1 sigma MSWD = 0.94, n = 39), constraining the age of the Wuda Tuff Flora to the earliest Permian. Depletions of Nb and Ta in both the whole-rock and zircon compositions indicate an arc-related setting for the volcanism.The positive epsilon Hf(t) values (0.0 to +5.0) and delta O-18 values (5.05 parts per thousand-6.17 parts per thousand) of zircon grains from the Wuda Tuff suggest a juvenile crust origin of the volcanic magma. Geochemical comparisons with contemporaneous igneous rocks suggest that the volcanic eruption that led to the formation of the Wuda Tuff and associated vegetational Pompeii was most probably caused by arc volcanism along the western margin of the NCC related to subduction of Paleo-Asian Ocean oceanic crust, implying that the Alm Terrane had not yet amalgamated with the NCC during the early Permian. (C) 2020 Published by Elsevier B.V.

KeywordWuda vegetational Pompeii Altered tuff North China Craton Zircon U-Pb geochronology Geochemistry Alxa Terrane
DOI10.1016/j.lithos.2020.105485
Indexed BySCI
Language英语
WOS KeywordPERMIAN VEGETATIONAL POMPEII ; HF ISOTOPE ANALYSES ; U-PB GEOCHRONOLOGY ; INNER-MONGOLIA ; ZIRCON MEGACRYSTS ; WORKING REFERENCE ; THRUST BELT ; ALXA BLOCK ; O ISOTOPES ; COAL
Funding ProjectStrategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] ; National Natural Science Foundation of China[41573028]
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000536183500002
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China
PublisherELSEVIER
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/31922
Collection中国科学院南京地质古生物研究所
Corresponding AuthorHe, Bin
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Univ Western Australia, Sch Earth Sci, Perth, WA 6009, Australia
4.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
5.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Wang, Man,Zhong, Yu-ting,He, Bin,et al. Geochronology and geochemistry of the fossil-flora-bearing Wuda Tuff in North China Craton and its tectonic implications[J]. LITHOS,2020,364:10.
APA Wang, Man,Zhong, Yu-ting,He, Bin,Denyszyn, Steven W.,Wang, Jun ,&Xu, Yi-gang.(2020).Geochronology and geochemistry of the fossil-flora-bearing Wuda Tuff in North China Craton and its tectonic implications.LITHOS,364,10.
MLA Wang, Man,et al."Geochronology and geochemistry of the fossil-flora-bearing Wuda Tuff in North China Craton and its tectonic implications".LITHOS 364(2020):10.
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