globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1909165116
论文题名:
Subglacial meltwater supported aerobic marine habitats during Snowball Earth
作者: Lechte M.A.; Wallace M.W.; van Smeerdijk Hood A.; Li W.; Jiang G.; Halverson G.P.; Asael D.; McColl S.L.; Planavsky N.J.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:51
起始页码: 25478
结束页码: 25483
语种: 英语
英文关键词: Fe isotopes ; Glaciation ; Iron formation ; Oxygenation ; Snowball Earth
Scopus关键词: aluminum ; cerium ; iron ; manganese ; manganese oxide ; oxygen ; sea water ; anoxia ; Article ; Cryogenian ; geochemistry ; glacial period ; glaciation ; glacier ; habitat ; ice sheet ; ice shelf ; marine environment ; oxidation ; oxidation reduction state ; oxygenation ; priority journal ; sedimentology ; subglacial meltwater
英文摘要: The Earth’s most severe ice ages interrupted a crucial interval in eukaryotic evolution with widespread ice coverage during the Cryogenian Period (720 to 635 Ma). Aerobic eukaryotes must have survived the “Snowball Earth” glaciations, requiring the persistence of oxygenated marine habitats, yet evidence for these environments is lacking. We examine iron formations within globally distributed Cryogenian glacial successions to reconstruct the redox state of the synglacial oceans. Iron isotope ratios and cerium anomalies from a range of glaciomarine environments reveal pervasive anoxia in the ice-covered oceans but increasing oxidation with proximity to the ice shelf grounding line. We propose that the outwash of subglacial meltwater supplied oxygen to the synglacial oceans, creating glaciomarine oxygen oases. The confluence of oxygen-rich meltwater and iron-rich seawater may have provided sufficient energy to sustain chemosynthetic communities. These processes could have supplied the requisite oxygen and organic carbon source for the survival of early animals and other eukaryotic heterotrophs through these extreme glaciations. © 2019 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162273
Appears in Collections:气候变化与战略

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作者单位: Lechte, M.A., School of Earth Sciences, University of Melbourne, Parkville, VIC 3010, Australia, Department of Earth and Planetary Science, McGill University, Montréal, QC H3A 0E8, Canada; Wallace, M.W., School of Earth Sciences, University of Melbourne, Parkville, VIC 3010, Australia; van Smeerdijk Hood, A., School of Earth Sciences, University of Melbourne, Parkville, VIC 3010, Australia; Li, W., State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, China; Jiang, G., Department of Geoscience, University of Nevada, Las Vegas, NV 89154, United States; Halverson, G.P., Department of Earth and Planetary Science, McGill University, Montréal, QC H3A 0E8, Canada; Asael, D., Department of Geology and Geophysics, Yale University, New Haven, CT 06511, United States; McColl, S.L., School of Earth Sciences, University of Melbourne, Parkville, VIC 3010, Australia; Planavsky, N.J., Department of Geology and Geophysics, Yale University, New Haven, CT 06511, United States

Recommended Citation:
Lechte M.A.,Wallace M.W.,van Smeerdijk Hood A.,et al. Subglacial meltwater supported aerobic marine habitats during Snowball Earth[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(51)
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