The timing and nature of changes in the chemistry of the early oceans are intensely debated. Geochemical analyses show that a prominent transition to sulphidic marine conditions 1.8 billion years ago may have been restricted to near-shore environments.
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Fike, D. Earth's redox evolution. Nature Geosci 3, 453–454 (2010). https://doi.org/10.1038/ngeo903
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DOI: https://doi.org/10.1038/ngeo903
