The lead isotopic age of the Earth can be explained by core formation alone

Bernard J. Wood, Alex N. Halliday

    Research output: Contribution to journalArticle

    68 Citations (Scopus)

    Abstract

    The meaning of the age of the Earth defined by lead isotopes has long been unclear. Recently it has been proposed that the age of the Earth deduced from lead isotopes reflects volatile loss to space at the time of the Moon-forming giant impact rather than partitioning into metallic liquids during protracted core formation. Here we show that lead partitioning into liquid iron depends strongly on carbon content and that, given a content of ∼0.2% carbon, experimental and isotopic data both provide evidence of strong partitioning of lead into the core throughout the Earths accretion. Earlier conclusions that lead is weakly partitioned into iron arose from the use of carbon-saturated (about 5% C) iron alloys. The lead isotopic age of the Earth is therefore consistent with partitioning into the core and with no significant late losses of moderately volatile elements to space during the giant impact.

    Original languageEnglish
    Pages (from-to)767-770
    Number of pages4
    JournalNature
    Volume465
    Issue number7299
    DOIs
    Publication statusPublished - 10 Jun 2010

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