globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12182
Scopus记录号: 2-s2.0-85027944588
论文题名:
Oceanic oxygenation events in the anoxic Ediacaran ocean
作者: Sahoo S.K.; Planavsky N.J.; Jiang G.; Kendall B.; Owens J.D.; Wang X.; Shi X.; Anbar A.D.; Lyons T.W.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期:5
起始页码: 457
结束页码: 468
语种: 英语
Scopus关键词: sea water ; anoxic conditions ; atmosphere-ocean system ; Ediacaran ; fossil record ; geomorphology ; mass extinction ; metazoan ; oxygen ; oxygenation ; paleogeography ; Phanerozoic ; sulfur isotope ; animal ; aquatic species ; chemistry ; China ; fossil ; metabolism ; oxidation reduction reaction ; sea ; sediment ; Animals ; Aquatic Organisms ; China ; Fossils ; Geologic Sediments ; Oceans and Seas ; Oxidation-Reduction ; Seawater ; China ; Animalia ; Metazoa
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The ocean-atmosphere system is typically envisioned to have gone through a unidirectional oxygenation with significant oxygen increases in the earliest (ca. 635 Ma), middle (ca. 580 Ma), or late (ca. 560 Ma) Ediacaran Period. However, temporally discontinuous geochemical data and the patchy metazoan fossil record have been inadequate to chart the details of Ediacaran ocean oxygenation, raising fundamental debates about the timing of ocean oxygenation, its purported unidirectional rise, and its causal relationship, if any, with the evolution of early animal life. To better understand the Ediacaran ocean redox evolution, we have conducted a multi-proxy paleoredox study of a relatively continuous, deep-water section in South China that was paleogeographically connected with the open ocean. Iron speciation and pyrite morphology indicate locally euxinic (anoxic and sulfidic) environments throughout the Ediacaran in this section. In the same rocks, redox sensitive element enrichments and sulfur isotope data provide evidence for multiple oceanic oxygenation events (OOEs) in a predominantly anoxic global Ediacaran-early Cambrian ocean. This dynamic redox landscape contrasts with a recent view of a redox-static Ediacaran ocean without significant change in oxygen content. The duration of the Ediacaran OOEs may be comparable to those of the oceanic anoxic events (OAEs) in otherwise well-oxygenated Phanerozoic oceans. Anoxic events caused mass extinctions followed by fast recovery in biologically diversified Phanerozoic oceans. In contrast, oxygenation events in otherwise ecologically monotonous anoxic Ediacaran-early Cambrian oceans may have stimulated biotic innovations followed by prolonged evolutionary stasis. © 2016 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85092
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Geoscience, University of Nevada, Las Vegas, NV, USA; Department of Geology and Geophysics, Yale University, New Haven, CT, USA; Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, USA; School of Earth Science and Resources, China University of Geosciences, Beijing, China; Department of Chemistry and Biochemistry, School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA; Department of Earth Sciences, University of California, Riverside, CA, USA

Recommended Citation:
Sahoo S.K.,Planavsky N.J.,Jiang G.,et al. Oceanic oxygenation events in the anoxic Ediacaran ocean[J]. Geobiology,2016-01-01,14(5)
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