The cocktail of noble-gas isotopes in an Icelandic rock suggests that the upper mantle does not, and never did, receive gas from a deeper mantle reservoir. This challenges ideas of deep Earth's behaviour and formation. See Letter p.101
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Ballentine, C. A dash of deep nebula on the rocks. Nature 486, 40–41 (2012). https://doi.org/10.1038/486040a
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DOI: https://doi.org/10.1038/486040a