Increasingly sophisticated techniques are being used to persuade ancient rocks to yield information about conditions on and in the early Earth — for instance, about the oxidation state of the mantle.
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McDonough, W. Deducing a reducing mantle. Nature 455, 881–883 (2008). https://doi.org/10.1038/455881a
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DOI: https://doi.org/10.1038/455881a
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