Ocean island lavas have complex geochemical signatures. Numerical simulations suggest that these signatures may reflect the entrainment and transport to Earth's surface of both primordial material and recycled oceanic crust by deeply rooted mantle plumes.
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Deschamps, F. Mantle plume chemical diversity. Nature Geosci 7, 330–331 (2014). https://doi.org/10.1038/ngeo2117
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DOI: https://doi.org/10.1038/ngeo2117