Shen, W, Zhu, X, Yan, B et al. (3 more authors) (2022) Secular variation in seawater redox state during the Marinoan Snowball Earth event and implications for eukaryotic evolution. Geology, 50 (11). pp. 1239-1244. ISSN 0091-7613
Abstract
The ocean is hypothesized to have been anoxic throughout the Marinoan “Snowball Earth” event, from ca. 649 to 635 Ma, with potentially catastrophic implications for the survival of eukaryotic life. However, the precise nature of ocean redox chemistry across this critical interval, and hence the factors that governed the persistence of eukaryotes, remains unknown. We report records of pyrite iron and sulfur isotopes, combined with Fe speciation, for glaciogenic diamictites from the Nantuo Formation of South China. These data provide constraints on seawater redox state across the Marinoan glaciation, and they reveal that the redox state of the ocean fluctuated in concert with waxing and waning extents of glaciation, to include intervals of expanded oxygenation. The input of meltwater-derived oxygen provides a potential explanation for the persistence of eukaryotes through the Cryogenian “Snowball Earth” events, which ultimately paved the way for subsequent intervals of rapid biological innovation.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 Geological Society of America. This is an author produced version of an article published in Geology. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 27 Jun 2022 12:47 |
Last Modified: | 29 Mar 2023 17:51 |
Status: | Published |
Publisher: | Geological Society of America |
Identification Number: | 10.1130/G50147.1 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:188204 |