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Evidence for hotspot-related carbonatite metasomatism in the oceanic upper mantle

Abstract

Four peridotite xenoliths from the islands of Savai'i (Western Samoa) and Tubuai (Austral Islands) contain primary olivine of lithospheric origin, and secondary assemblages of clinopyroxene + spinel ± apatite. The trace-element contents of the secondary minerals show that they formed in equilibrium with carbonate-rich melts. Moreover, isotopic results indicate that these melts were derived from recycled crustal components in the convecting mantle, and place constraints on the origins of these components.

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Hauri, E., Shimizu, N., Dieu, J. et al. Evidence for hotspot-related carbonatite metasomatism in the oceanic upper mantle. Nature 365, 221–227 (1993). https://doi.org/10.1038/365221a0

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