Confidence that banded iron formations record oxic conditions during deposition is established, as a model demonstrates that they are formed of primary iron oxides rather than secondarily altered silicate minerals.
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Stüeken, E.E. Ancient rust. Nat. Geosci. 12, 498–499 (2019). https://doi.org/10.1038/s41561-019-0396-5
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DOI: https://doi.org/10.1038/s41561-019-0396-5
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