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

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.

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Publication Details

Journal
Science Advances
Published
2024-09-27
DOI
https://doi.org/10.1126/sciadv.adp2426
Citations
25
Primary Topic
Astro and Planetary Science
Type
article
Field-Weighted Citation Impact
8.29
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article

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

Makiko K. Haba, Laurette Piani, Shigekazu Yoneda, Nicolas Dauphas et al.
25 citations
Science Advances
Astro and Planetary Science
8.29
article

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

Makiko K. Haba, Laurette Piani, Shigekazu Yoneda, Nicolas Dauphas, M. Wadhwa, Hiroshi Naraoka, Katsuyuki Yamashita, Liping Qin, Ikshu Gautam, Ryuji Okazaki, Yuichi Tsuda, Masahiro Nishimura, Andreas Pack, Christoph Burkhardt, Qing‐Zhu Yin, Ming‐Chang Liu, Kanako Sakamoto, Tommaso Di Rocco, Shoichi Itoh, Fridolin Spitzer, Sei‐ichiro Watanabe, P. Höppe, S. Amari, Kazuhide Nagashima, Izumi Nakai, Noriyuki Kawasaki, Kouki Kitajima, A. M. Davis, Shogo Tachibana, Hiroshi Hidaka, Yoshinari Abe, Martin Bizzarro, Aiko Nakato, S. S. Russell, R. J. Walker, Frédéric Moynier, Makoto Yoshikawa, Timo Hopp, Tomoki Nakamura, Tatsuaki Okada, Masanao Abe, Tetsuya Yokoyama, J. Aléon, Tomohiro Usui, Shintaro Komatani, Alexander N. Krot, Hikaru Yabuta, Hisayoshi Yurimoto, Fuyuto Terui, Ryota Fukai, Toru Yada, Takanao Saiki, G. R. Huss, Haolan Tang, Edward Young, A. N. Nguyen, T. R. Ireland, Changkun Park, Satoru Nakazawa, Maria Schönbächler, Ken‐ichi Bajo, Byeon‐Gak Choi, Yuki Masuda, L. R. Nittler, N. T. Kita, Yuri Amelin, Audrey Bouvier, Hiroharu Yui, Wataru Fujiya, Lauren Tafla, Hisashi Homma, Kentaro Terada, T. Noguchi, Ai‐Cheng Zhang, Marc Chaussidon, Tsuyoshi Iizuka, Yuki Hibiya, Kiyohiro Ichida, C. M. O'd. Alexander, Akiko Miyazaki, Yasuko Terada, T. Kleine, Naoya Sakamoto, Kasumi Yogata, Kazuko Motomura, Richard W. Carlson, Morihiko Onose, Satoshi Tanaka, Akira Ishikawa, Sohei Wada, Mayu Morita
article en
25 citations

Abstract

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.

Science AdvancesVol. 10(39)
Hiroshima University (JP), James S. McDonnell Foundation (US), Tokyo Institute of Technology (JP), University of Hawaiʻi at Mānoa (US), University of Copenhagen (DK), University of Science and Technology of China (CN), Centre National de la Recherche Scientifique (FR), Planetary Science Institute (US), Japan Agency for Marine-Earth Science and Technology (JP), Natural History Museum (GB), University of Wisconsin–Madison (US), Kyushu University (JP), Institut de physique du globe de Paris (FR), Horiba (Japan) (JP), Seoul National University of Education (KR), Tokyo University of Science (JP), Okayama University (JP), The University of Queensland (AU), Tokyo Denki University (JP), Kanagawa Institute of Technology (JP), Carnegie Institution for Science (US), Chinese Academy of Sciences (CN), Tohoku University (JP), Université Paris Cité (FR), Hokkaido University (JP), Kyoto University (JP), Guangzhou Institute of Geochemistry (CN), ETH Zurich (CH), Sorbonne Université (FR), University of Chicago (US), Laboratoire de Minéralogie & Cosmochimie du Muséum (FR), Korea Polar Research Institute (KR), Centre de Recherches Pétrographiques et Géochimiques (FR), Japan Synchrotron Radiation Research Institute (JP), Osaka Health Science University (JP), Max Planck Institute for Chemistry (DE), Rigaku (Japan) (JP), National Sagamihara Hospital (JP), Max Planck Institute for Solar System Research (DE), Institut de minéralogie, de physique des matériaux et de cosmochimie (FR), Johnson Space Center (US), National Museum of Nature and Science (JP), Seikagaku Corporation (Japan) (JP), Institut de Recherche pour le Développement (FR), University of Bayreuth (DE), Arizona State University (US), Nagoya University (JP), Ibaraki University (JP), University of Maryland, College Park (US), University of Göttingen (DE), The University of Tokyo (JP), University of California, Davis (US), Nanjing University (CN), The University of Osaka (JP)
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