Physical Sciences Division
Published December 16, 2022 | Version v1
Journal article Open

Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2

Creators

  • 1. Hokkaido University
  • 2. University of Hawai'i at Mānoa
  • 3. Kyoto University
  • 4. Tokyo Institute of Technology
  • 5. Natural History Museum
  • 6. Tokyo Denki University
  • 7. Sorbonne Université
  • 8. Carnegie Institution for Science
  • 9. Washington University in St. Louis
  • 10. Chinese Academy of Sciences
  • 11. University of Copenhagen
  • 12. Universität Bayreuth
  • 13. Centre National de la Recherche Scientifique
  • 14. University of Chicago

Description

The extraterrestrial materials returned from asteroid (162173) Ryugu consist predominantly of low-temperature aqueously formed secondary minerals and are chemically and mineralogically similar to CI (Ivuna-type) carbonaceous chondrites. Here, we show that high-temperature anhydrous primary minerals in Ryugu and CI chondrites exhibit a bimodal distribution of oxygen isotopic compositions: 16O-rich (associated with refractory inclusions) and 16O-poor (associated with chondrules). Both the 16O-rich and 16O-poor minerals probably formed in the inner solar protoplanetary disk and were subsequently transported outward. The abundance ratios of the 16O-rich to 16O-poor minerals in Ryugu and CI chondrites are higher than in other carbonaceous chondrite groups but are similar to that of comet 81P/Wild2, suggesting that Ryugu and CI chondrites accreted in the outer Solar System closer to the accretion region of comets.

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.

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Additional details

Identifiers

DOI
10.1126/sciadv.ade2067
Other
oai:uchicago.tind.io:11055

Funding

Japan Society for the Promotion of Science

UChicago Information

Division(s)
Physical Sciences Division
Department(s)
Geophysical Sciences