Centers and Institutes
Published November 8, 2023 | Version v1
Journal article Open

Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample

Creators

  • 1. Tokyo Institute of Technology
  • 2. Arizona State University
  • 3. The University of Tokyo
  • 4. ISAS/JSEC
  • 5. Tokyo Denki University
  • 6. Sorbonne Université
  • 7. Carnegie Institution for Science
  • 8. Washington University in St. Louis
  • 9. Chinese Academy of Sciences
  • 10. Hokkaido University
  • 11. University of Copenhagen
  • 12. Universität Bayreuth
  • 13. Université Paris Cité
  • 14. Seoul National University
  • 15. University of Chicago

Description

Studies of material returned from Cb asteroid Ryugu have revealed considerable mineralogical and chemical heterogeneity, stemming primarily from brecciation and aqueous alteration. Isotopic anomalies could have also been affected by delivery of exogenous clasts and aqueous mobilization of soluble elements. Here, we show that isotopic anomalies for mildly soluble Cr are highly variable in Ryugu and CI chondrites, whereas those of Ti are relatively uniform. This variation in Cr isotope ratios is most likely due to physicochemical fractionation between 54Cr-rich presolar nanoparticles and Cr-bearing secondary minerals at the millimeter-scale in the bulk samples, likely due to extensive aqueous alteration in their parent bodies that occurred 5:2þ11::84 Ma after Solar System birth. In contrast, Ti isotopes were marginally affected by this process. Our results show that isotopic heterogeneities in asteroids are not all nebular or accretionary in nature but can also reflect element redistribution by water.

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

All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Data of Hayabusa2 sample 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.adi7048.pdf

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Additional details

Identifiers

DOI
10.1126/sciadv.adi7048
Other
oai:uchicago.tind.io:11037

Funding

Japan Society for the Promotion of Science
18H01258
Japan Society for the Promotion of Science
19H00715
Japan Society for the Promotion of Science
21KK0057
Japan Society for the Promotion of Science
22H00170
Japan Society for the Promotion of Science
21KK0058

UChicago Information

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