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Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition
Hu, Zhongya1,2; Li, Weiqiang2; Zhang, Hua(张华)3,4; Krainer, Karl5; Zheng, Quan-feng(郑全峰)3,4; Xia, Zhiguang2; Hu, Wenxuan2; Shen, Shu-zhong2,4,6,7
2021-02-15
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
Volume556Pages:11
Abstract

The Permian-Triassic transition witnessed the largest mass extinction event in Earth's history, multiple mechanisms have been proposed to explain the cause of this catastrophe, however, relatively less attention has been paid to the paleogeography and major element chemistry of seawater and its possible link to mass extinction during this interval. Syndepositional massive marine dolostones could record the Mg isotope signature of contemporaneous seawater that hold clues of ancient Mg cycling. In this study, we investigated Mg isotopes of dolomite from three widely spaced carbonate sections in the Paleotethys to trace oceanic Mg cycling during this critical period. The latest Permian dolostones from all studied sections have similar delta Mg-26 values around -2.1 +/- 0.1 parts per thousand. However, a remarkable and consistent increase in delta Mg-26(dolomite) across the extinction interval occurred in both eastern and western margins of the Paleotethys. The results suggest that delta Mg-26 of seawater in Paleotethys fluctuated by 0.4 parts per thousand within similar to 750 kyr across the Permian-Triassic transition. Modeling reveals that the high rate of change in delta 26Mg(seawater)required an extremely short residence time for seawater Mg. This is attributed to dramatically intensified dolomitization in a restricted oceanic environment, with Mg isotope evidence revealing that the Paleotethys Ocean experienced transient restriction events, in association with radical changes in the major cation composition of seawater, around the end-Permian mass extinction event (EPME). (C) 2020 Elsevier B.V. All rights reserved.

Keyworddolomite Mg isotopes Permian-Triassic transition Paleotethys restriction
DOI10.1016/j.epsl.2020.116704
Indexed BySCI
Language英语
WOS KeywordDISORDERED DOLOMITE ; CARBON-CYCLE ; SOUTH CHINA ; FRACTIONATION ; DOLOMITIZATION ; CALCITE ; PRECIPITATION ; CHEMISTRY ; RECOVERY ; OUTLOOK
Funding ProjectStrategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB26000000] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-DQC023] ; National Science Foundation of China[41473002] ; National Science Foundation of China[41561144002] ; National Science Foundation of China[41622301] ; National Science Foundation of China[U1702242] ; National Science Foundation of China[41273081]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000605759500001
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences ; Key Research Program of Frontier Sciences, CAS ; National Science Foundation of China
PublisherELSEVIER
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/37749
Collection中国科学院南京地质古生物研究所
Corresponding AuthorLi, Weiqiang; Zhang, Hua(张华)
Affiliation1.Tongji Univ, Sch Ocean & Earth Sci, State Key Lab Marine Geol, Shanghai, Peoples R China
2.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing, Jiangsu, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Jiangsu, Peoples R China
4.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing, Jiangsu, Peoples R China
5.Univ Innsbruck, Inst Geol & Paleontol, Innsbruck, Austria
6.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
7.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Hu, Zhongya,Li, Weiqiang,Zhang, Hua,et al. Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition[J]. EARTH AND PLANETARY SCIENCE LETTERS,2021,556:11.
APA Hu, Zhongya.,Li, Weiqiang.,Zhang, Hua.,Krainer, Karl.,Zheng, Quan-feng.,...&Shen, Shu-zhong.(2021).Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition.EARTH AND PLANETARY SCIENCE LETTERS,556,11.
MLA Hu, Zhongya,et al."Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition".EARTH AND PLANETARY SCIENCE LETTERS 556(2021):11.
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