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Major and Trace Element Geochemistry of the Permian-Triassic Boundary Section at Meishan, South China
Dudas, Francis O.1; Zhang, Hua(张华)2,3; Shen, Shu-Zhong4,5; Bowring, Samuel A.1
2021-07-20
Source PublicationFRONTIERS IN EARTH SCIENCE
Volume9Pages:21
Abstract

We report extensive major and trace element data for the Permian-Triassic boundary (PTB) at Meishan, China. Analyses of 64 samples from a 2.5 m section span the last 75 kyr of the Permian and the first 335 kyr of the Triassic, from beds 24 to 34. We also report data for 20 acetic acid extracts that characterize the carbonate fraction. Whole rock major element data reflect the change of lithology from carbonate in the Permian to mudstone and marl in the Triassic, indicate an increase of siliciclastic input and MgO in and above the extinction interval (beds 24f-28), and silica diagenesis in carbonates below the extinction horizon. Above bed 27, enrichment factors calculated with respect to Al and Post-Archean Australian Shale (PAAS) are similar to 1 for most trace elements, confirming that siliciclastic input dominates trace element distributions in the Triassic. Within the extinction interval, beds 24f and 26 show increases in As, Mo, U and some transition metals. V, Cr, Co, Ni, Cu, Zn, Pb, and Ba are variably enriched, particularly in bed 26. Below the extinction interval, the top of bed 24d shows enrichment of V, Cr, Co, Ni, Cu, Zn, Pb, and Ba in a zone of diagenetic silicification. Trace elements thus reflect siliciclastic input, diagenetic redistribution, and responses to redox conditions. Trace element patterns suggest either a change in provenance of the detrital component, or a change in the proportion of mechanical to chemical weathering that is coincident with the beginning of the extinction in bed 24f. Ba, Zr, and Zn behave anomalously. Ba shows little variation, despite changes in biological activity and redox conditions. The enrichment factor for Zr is variable in the carbonates below bed 24f, suggesting diagenetic Zr mobility. Zn shows a sharp drop in the extinction horizon, suggesting that its distribution was related to phytoplankton productivity. Rare earth element content is controlled by the siliciclastic fraction, and carbonate extracts show middle rare earth enrichment due to diagenesis. Ce and Eu anomalies are not reliable indicators of the redox environment at Meishan.

KeywordMeishan Permian-Triassic boundary rare earth elements diagenesis major and trace elements
DOI10.3389/feart.2021.637102
Indexed BySCI
Language英语
WOS KeywordRARE-EARTH-ELEMENTS ; MASS EXTINCTION ; SIBERIAN TRAPS ; OCEAN ACIDIFICATION ; GSSP SECTION ; VOLCANIC ASH ; 2 EPISODES ; END ; SEAWATER ; SULFUR
Funding ProjectStrategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB26000000] ; NSFC[41290260] ; NSFC[41420104003] ; NASA (United States) Astrobiology grant[NNA08CN84A]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000680400200001
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences ; NSFC ; NASA (United States) Astrobiology grant
PublisherFRONTIERS MEDIA SA
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/38445
Collection中国科学院南京地质古生物研究所
Corresponding AuthorDudas, Francis O.
Affiliation1.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing, Peoples R China
4.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing, Peoples R China
5.Nanjing Univ, Frontiers Sci Ctr Crit Earth Mat Cycling, Nanjing, Peoples R China
Recommended Citation
GB/T 7714
Dudas, Francis O.,Zhang, Hua,Shen, Shu-Zhong,et al. Major and Trace Element Geochemistry of the Permian-Triassic Boundary Section at Meishan, South China[J]. FRONTIERS IN EARTH SCIENCE,2021,9:21.
APA Dudas, Francis O.,Zhang, Hua,Shen, Shu-Zhong,&Bowring, Samuel A..(2021).Major and Trace Element Geochemistry of the Permian-Triassic Boundary Section at Meishan, South China.FRONTIERS IN EARTH SCIENCE,9,21.
MLA Dudas, Francis O.,et al."Major and Trace Element Geochemistry of the Permian-Triassic Boundary Section at Meishan, South China".FRONTIERS IN EARTH SCIENCE 9(2021):21.
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