globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116244
论文题名:
Enhanced chemical weathering triggered an expansion of euxinic seawater in the aftermath of the Sturtian glaciation
作者: Wei G.-Y.; Wei W.; Wang D.; Li T.; Yang X.; Shields G.A.; Zhang F.; Li G.; Chen T.; Yang T.; Ling H.-F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 539
语种: 英语
中文关键词: Cryogenian ocean ; lithium isotopes ; marine redox states ; silicate weathering ; south China
英文关键词: Chemical speciation ; Expansion ; Geochemistry ; Glacial geology ; Iron ; Isotopes ; Sedimentary rocks ; Silicates ; Sulfur compounds ; Trace elements ; Cryogenian ; Lithium isotopes ; Redox state ; Silicate weathering ; South China ; Weathering ; chemical weathering ; cryogenic fluid ; euxinic environment ; glaciation ; isotopic analysis ; lithium ; redox conditions ; seawater ; silicate ; trigger mechanism ; China ; algae ; Eukaryota ; Metazoa
英文摘要: The Cryogenian Period comprised two episodes of global glaciation (Sturtian and Marinoan glaciations) separated by a non-glacial interval, which was characterized by early radiations of eukaryotic algae and putative metazoans. Geochemical data indicate that the non-glacial interval might be marked by a transient marine oxygenation, nevertheless oceanic redox conditions varied both in time and space. Further, the links between non-glacial climate and marine redox variations are not well constrained. Here we present high-resolution lithium isotope (δ7Li), Fe speciation and trace element (Mo and U) data for clastic sedimentary rocks from the Cryogenian interglacial Datangpo Formation, South China, in order to track the evolution of continental chemical silicate weathering and driving factors behind marine redox variability during the Cryogenian non-glacial interval. A significantly negative δ7Li excursion of ∼−5‰ is observed in the basal Datangpo Formation, suggesting a dramatic increase in chemical silicate weathering intensity in the aftermath of the Sturtian glaciation. Expansion and contraction of anoxic-sulfidic conditions, as demonstrated by Fe speciation and trace element (Mo and U) data, mirror changes in silicate weathering intensity. Our study provides evidence that greater nutrient and sulfate availability, due to high silicate weathering intensity associated with increased exposure of fresh rocks and a warm climate, facilitated the spread of euxinic waters over the continental margins of the otherwise ferruginous Cryogenian ocean. © 2020
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165343
Appears in Collections:气候变化与战略

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作者单位: School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China; Department of Geology and Geophysics, Yale University, New Haven, CT 06520, United States; CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; School of Geographic Science, Nantong University, Nantong, 226019, China; MOE Key Laboratory of Surficial Geochemistry, Department of Earth and Planetary Sciences, Nanjing University, Nanjing, 210023, China; Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom

Recommended Citation:
Wei G.-Y.,Wei W.,Wang D.,et al. Enhanced chemical weathering triggered an expansion of euxinic seawater in the aftermath of the Sturtian glaciation[J]. Earth and Planetary Science Letters,2020-01-01,539
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