Rubidium isotopes in primitive chondrites: constraints on Earth's volatile element depletion and lead isotope evolution

O. Nebel, K. Mezger, W. van Westrenen

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    The bulk silicate Earth (BSE) shows substantial deficits in volatile elements compared to CI-chondrites and solar abundances. These deficits could be caused by pre-accretionary depletion in the solar nebula during condensation of solids, or by later heat-driven evaporation during collision of small bodies that later accreted to form the Earth. The latter is considered to result in isotope fractionation for elements with low condensation temperatures that correlates with the degree of depletion. Here, we report first high-precision isotope ratio measurements of the moderately volatile and lithophile trace element Rb. Data from seventeen chondrite meteorites show that their Rb isotope abundances are nearly indistinguishable from Earth, not deviating more than 1 per mil in their
    Original languageEnglish
    Pages (from-to)309-316
    JournalEarth and Planetary Science Letters
    Volume2011
    Issue number305
    DOIs
    Publication statusPublished - 2011

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