A study of cerium in zircon minerals has allowed an assessment of the redox conditions that prevailed when Earth's earliest magmas formed. The results suggest that the mantle became oxidized sooner than had been thought. See Letter p.79
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Scaillet, B., Gaillard, F. Redox state of early magmas. Nature 480, 48–49 (2011). https://doi.org/10.1038/480048a
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DOI: https://doi.org/10.1038/480048a
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