Atmospheric oxygen, supplied from the oceans, dramatically rose during the Great Oxidation Event. Our examination of the preceding evolution of seawater oxygenation revealed that the redox state in seawater oscillated between oxic and anoxic conditions before oceanic oxygenation again increased towards the dawn of the Great Oxidation Event.
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References
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This is a summary of: Liang, X. et al. A seawater oxygen oscillation recorded by iron formations prior to the Great Oxidation Event. Nat. Geosci. https://doi.org/10.1038/s41561-025-01683-7 (2025).
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Fluctuating evolution of seawater oxygen before the Great Oxidation Event. Nat. Geosci. 18, 378–379 (2025). https://doi.org/10.1038/s41561-025-01688-2
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DOI: https://doi.org/10.1038/s41561-025-01688-2
