globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116704
论文题名:
Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition
作者: Hu Z.; Li W.; Zhang H.; Krainer K.; Zheng Q.-F.; Xia Z.; Hu W.; Shen S.-Z.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 556
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165518
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Hu Z.,Li W.,Zhang H.,et al. Mg isotope evidence for restriction events within the Paleotethys ocean around the Permian-Triassic transition[J]. Earth and Planetary Science Letters,2021-01-01,556
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