气候变化领域集成服务门户(CCPortal): Enhanced chemical weathering triggered an expansion of euxinic seawater in the aftermath of the Sturtian glaciation

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DOI	10.1016/j.epsl.2020.116244
	Enhanced chemical weathering triggered an expansion of euxinic seawater in the aftermath of the Sturtian glaciation
	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.
发表日期	2020
ISSN	0012821X
卷号	539
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
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
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/202965
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
推荐引用方式 GB/T 7714	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],2020,539.
APA	Wei G.-Y..,Wei W..,Wang D..,Li T..,Yang X..,...&Ling H.-F..(2020).Enhanced chemical weathering triggered an expansion of euxinic seawater in the aftermath of the Sturtian glaciation.Earth and Planetary Science Letters,539.
MLA	Wei G.-Y.,et al."Enhanced chemical weathering triggered an expansion of euxinic seawater in the aftermath of the Sturtian glaciation".Earth and Planetary Science Letters 539(2020).