Osmium isotopes record evidence for 2.5-billion-year-old mantle beneath the Azores. The origin of this ancient mantle has implications for the nature and timescale of mantle convection.
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Widom, E. Ancient mantle in a modern plume. Nature 420, 281–282 (2002). https://doi.org/10.1038/420281a
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DOI: https://doi.org/10.1038/420281a
