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Earth's redox evolution

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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Figure 1: Schematic of ocean redox conditions 1.8 billion years ago.


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Fike, D. Earth's redox evolution. Nature Geosci 3, 453–454 (2010).

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