A 'late veneer' of meteoritic material, added after Earth's core had formed, may be the source of our noble metals. Its absence from some parts of Earth's mantle will now force a rethink about this late accretion. See Letter p.195
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Kleine, T. Earth's patchy late veneer. Nature 477, 168–169 (2011). https://doi.org/10.1038/477168a
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DOI: https://doi.org/10.1038/477168a
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