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DOI	10.1016/j.epsl.2020.116704
	Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition
	Hu Z.; Li W.; Zhang H.; Krainer K.; Zheng Q.-F.; Xia Z.; Hu W.; Shen S.-Z.
发表日期	2021
ISSN	0012821X
卷号	556
英文摘要	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 δ26Mg values around −2.1±0.1‰. However, a remarkable and consistent increase in δ26Mgdolomite across the extinction interval occurred in both eastern and western margins of the Paleotethys. The results suggest that δ26Mg of seawater in Paleotethys fluctuated by 0.4‰ within ∼750 kyr across the Permian-Triassic transition. Modeling reveals that the high rate of change in δ26Mgseawater 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). © 2020 Elsevier B.V.
关键词	dolomite Mg isotopes Paleotethys Permian–Triassic transition restriction
英文关键词	Isotopes; Seawater; Critical periods; Dolomitization; Extinction intervals; Major elements; Mass extinction; Mass extinction events; Oceanic environments; Paleogeography; Magnesium; dolomite; dolomitization; isotopic composition; magnesium; mass extinction; paleoceanography; paleoenvironment; paleogeography; Permian-Triassic boundary; seawater; Tethys
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203140
作者单位	State Key Laboratory of Marine Geology, School of Ocean and Earth Science, Tongji University, Shanghai, China; State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu, China; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, Jiangsu, China; Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, Jiangsu, China; Institute of Geology and Paleontology, University of Innsbruck, Austria; Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China
推荐引用方式 GB/T 7714	Hu Z.,Li W.,Zhang H.,et al. Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition[J],2021,556.
APA	Hu Z..,Li W..,Zhang H..,Krainer K..,Zheng Q.-F..,...&Shen S.-Z..(2021).Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition.Earth and Planetary Science Letters,556.
MLA	Hu Z.,et al."Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition".Earth and Planetary Science Letters 556(2021).