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Potassium isotope heterogeneity in the early Solar System controlled by extensive evaporation and partial recondensation

Author

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  • Yan Hu

    (Université Paris Cité, Institut de Physique du Globe de Paris, CNRS)

  • Frédéric Moynier

    (Université Paris Cité, Institut de Physique du Globe de Paris, CNRS)

  • Martin Bizzarro

    (Université Paris Cité, Institut de Physique du Globe de Paris, CNRS
    University of Copenhagen)

Abstract

Volatiles are vital ingredients for a habitable planet. Angrite meteorites sample the most volatile-depleted planetesimal in the Solar System, particularly for the alkali elements. They are prime targets for investigating the formation of volatile-poor rocky planets, yet their exceptionally low volatile content presents a major analytical challenge. Here, we leverage improved sensitivity and precision of K isotopic analysis to constrain the mechanism of extreme K depletion (>99.8%) in angrites. In contrast with the isotopically heavy Moon and Vesta, we find that angrites are strikingly depleted in the heavier K isotopes, which is best explained by partial recondensation of vaporized K following extensive evaporation on the angrite parent body (APB) during magma-ocean stage. Therefore, the APB may provide a rare example of isotope fractionation controlled by condensation, rather than evaporation, at a planetary scale. Furthermore, nebula-wide K isotopic variations primarily reflect volatility-driven fractionations instead of presolar nucleosynthetic heterogeneity proposed previously.

Suggested Citation

  • Yan Hu & Frédéric Moynier & Martin Bizzarro, 2022. "Potassium isotope heterogeneity in the early Solar System controlled by extensive evaporation and partial recondensation," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35362-7
    DOI: 10.1038/s41467-022-35362-7
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    References listed on IDEAS

    as
    1. Martin Schiller & Martin Bizzarro & Vera Assis Fernandes, 2018. "Isotopic evolution of the protoplanetary disk and the building blocks of Earth and the Moon," Nature, Nature, vol. 555(7697), pages 507-510, March.
    2. Remco C. Hin & Christopher D. Coath & Philip J. Carter & Francis Nimmo & Yi-Jen Lai & Philip A. E. Pogge von Strandmann & Matthias Willbold & Zoë M. Leinhardt & Michael J. Walter & Tim Elliott, 2017. "Magnesium isotope evidence that accretional vapour loss shapes planetary compositions," Nature, Nature, vol. 549(7673), pages 511-515, September.
    3. Richard C. Greenwood & Ian A. Franchi & Albert Jambon & Paul C. Buchanan, 2005. "Widespread magma oceans on asteroidal bodies in the early Solar System," Nature, Nature, vol. 435(7044), pages 916-918, June.
    4. Joel Baker & Martin Bizzarro & Nadine Wittig & James Connelly & Henning Haack, 2005. "Early planetesimal melting from an age of 4.5662 Gyr for differentiated meteorites," Nature, Nature, vol. 436(7054), pages 1127-1131, August.
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