The origin of the 'EM-1 signature' evident in certain basalt rocks is a long-standing puzzle. Comparison of data from Pitcairn Island and Sardinia may shed some light on the enigma.
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Hanan, B. Mantle recycled in Sardinia. Nature 408, 657–659 (2000). https://doi.org/10.1038/35047205
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DOI: https://doi.org/10.1038/35047205
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