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Earth science

Ancient mantle in a modern plume

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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Figure 1

MARC DUBIN/TRAVEL INK

Figure 2: Osmium isotope signatures in different mantle reservoirs5,10,11.

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Correspondence to Elisabeth Widom.

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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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