Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1909165116 |
Subglacial meltwater supported aerobic marine habitats during Snowball Earth | |
Maxwell A. Lechte; Malcolm W. Wallace; Ashleigh van Smeerdijk Hood; Weiqiang Li; Ganqing Jiang; Galen P. Halverson; Dan Asael; Stephanie L. McColl; Noah J. Planavsky | |
2019-12-17 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8456 |
出版年 | 2019 |
卷号 | 116期号:51页码:25478-25483 |
英文摘要 | AbstractThe 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. |
英文关键词 | oxygenation glaciation Snowball Earth iron formation Fe isotopes |
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引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/226632 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | Maxwell A. Lechte,Malcolm W. Wallace,Ashleigh van Smeerdijk Hood,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,2019,116(51):25478-25483. |
APA | Maxwell A. Lechte.,Malcolm W. Wallace.,Ashleigh van Smeerdijk Hood.,Weiqiang Li.,Ganqing Jiang.,...&Noah J. Planavsky.(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),25478-25483. |
MLA | Maxwell A. Lechte,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):25478-25483. |
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