Centers and Institutes
Published September 27, 2024 | Version v1
Journal article Open

The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites

Creators

  • 1. Max Planck Institute for Solar System Research
  • 2. Tokyo Institute of Technology
  • 3. Tokyo Denki University
  • 4. Sorbonne Université
  • 5. Carnegie Institution for Science
  • 6. Washington University in St. Louis
  • 7. Chinese Academy of Sciences
  • 8. Hokkaido University
  • 9. University of Copenhagen
  • 10. Universität Bayreuth
  • 11. Université Paris Cité
  • 12. Seoul National University
  • 13. University of Chicago
  • 14. University of Göttingen
  • 15. Ibaraki University
  • 16. JAXA

Description

The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct from other carbonaceous chondrites, which has led to the suggestion that Ryugu/CI chondrites formed in a different region of the accretion disk, possibly around the orbits of Uranus and Neptune. We show that, like for Fe, Ryugu and CI chondrites also have indistinguishable Ni isotope anomalies, which differ from those of other carbonaceous chondrites. We propose that this unique Fe and Ni isotopic composition reflects different accretion efficiencies of small FeNi metal grains among the carbonaceous chondrite parent bodies. The CI chondrites incorporated these grains more efficiently, possibly because they formed at the end of the disk's lifetime, when planetesimal formation was also triggered by photoevaporation of the disk. Isotopic variations among carbonaceous chondrites may thus reflect fractionation of distinct dust components from a common reservoir, implying CI chondrites/Ryugu may have formed in the same region of the accretion disk as other carbonaceous chondrites.

Notes

Due to the large number of authors, only the first 20 and the University of Chicago authors are included on the above author list. Please download the article for the complete list of authors.

Data availability

Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Data from the Hayabusa2 samples and other data from the mission are available at the DARTS archive at www.darts.isas.jaxa.jp/curation/hayabusa2 and www.darts.isas.jaxa.jp/planet/project/hayabusa2/.

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sciadv.adp2426.pdf

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Additional details

Identifiers

DOI
10.1126/sciadv.adp2426
Other
oai:uchicago.tind.io:13605

Funding

Deutsche Forschungsgemeinschaft
263649064

UChicago Information

Division(s)
Physical Sciences Division
Department(s)
Enrico Fermi Institute, Geophysical Sciences