A new model could explain why Earth's upper mantle is depleted of many trace elements. At a certain depth, minerals might release water, creating a molten filter that traps trace elements in the mantle beneath.
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Hofmann, A. Just add water. Nature 425, 24–25 (2003). https://doi.org/10.1038/425024a
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DOI: https://doi.org/10.1038/425024a
