Skip to Main content Skip to Navigation
Journal articles

Iron isotope evidence for very rapid accretion and differentiation of the proto-Earth

Abstract : Nucleosynthetic isotope variability among solar system objects provides insights into the accretion history of terrestrial planets. We report on the nucleosynthetic Fe isotope composition (μ54Fe) of various meteorites and show that the only material matching the terrestrial composition is CI (Ivuna-type) carbonaceous chondrites, which represent the bulk solar system composition. All other meteorites, including carbonaceous, ordinary, and enstatite chondrites, record excesses in μ54Fe. This observation is inconsistent with protracted growth of Earth by stochastic collisional accretion, which predicts a μ54Fe value reflecting a mixture of the various meteorite parent bodies. Instead, our results suggest a rapid accretion and differentiation of Earth during the ~5–million year disk lifetime, when the volatile-rich CI-like material is accreted to the proto-Sun via the inner disk.
Complete list of metadata

Cited literature [60 references]  Display  Hide  Download
Contributor : Eva Fareau Connect in order to contact the contributor
Submitted on : Monday, April 27, 2020 - 3:34:44 PM
Last modification on : Friday, August 5, 2022 - 12:31:27 PM


Publisher files allowed on an open archive




Martin Schiller, Martin Bizzarro, Julien Siebert. Iron isotope evidence for very rapid accretion and differentiation of the proto-Earth. Science Advances , American Association for the Advancement of Science (AAAS), 2020, 6, pp.eaay7604. ⟨10.1126/sciadv.aay7604⟩. ⟨insu-02555742⟩



Record views


Files downloads