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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DOI: https://doi.org/10.1038/365221a0
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