气候变化领域集成服务门户(CCPortal): Subglacial meltwater supported aerobic marine habitats during Snowball Earth

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DOI	10.1073/pnas.1909165116
	Subglacial meltwater supported aerobic marine habitats during Snowball Earth
	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.
发表日期	2019
ISSN	0027-8424
起始页码	25478
结束页码	25483
卷号	116 期号:51
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.
英文关键词	Fe isotopes; Glaciation; Iron formation; Oxygenation; Snowball Earth
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159032
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 Universit...
推荐引用方式 GB/T 7714	Lechte M.A.,Wallace M.W.,van Smeerdijk Hood A.,et al. Subglacial meltwater supported aerobic marine habitats during Snowball Earth[J],2019,116(51).
APA	Lechte M.A..,Wallace M.W..,van Smeerdijk Hood A..,Li W..,Jiang G..,...&Planavsky N.J..(2019).Subglacial meltwater supported aerobic marine habitats during Snowball Earth.Proceedings of the National Academy of Sciences of the United States of America,116(51).
MLA	Lechte M.A.,et al."Subglacial meltwater supported aerobic marine habitats during Snowball Earth".Proceedings of the National Academy of Sciences of the United States of America 116.51(2019).