The parent bodies of Ryugu and Ivuna formed before those of other carbonaceous chondrites

Most carbonaceous chondrite (CC) meteorites contain abundant chondrules, millimeter-scale spherical inclusions of previously molten material. Ivuna-type carbonaceous chondrites (CIs) do not contain chondrules, nor do samples of the carbonaceous asteroid Ryugu. CIs and Ryugu share isotopic properties distinct from those of other CCs, implying that their parent bodies formed at a different time or place than those of other CCs. We applied manganese-chromium dating and oxygen isotope thermometry to Ryugu and Ivuna samples. The results indicate that the parent bodies of Ryugu and Ivuna formed less than 2 million years after the beginning of Solar System formation—before the majority of chondrules in CCs and the parent bodies of other CCs formed. This implies that Ryugu and CIs are remnants of an earlier generation of carbonaceous planetesimals.

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Publication Details

Journal
Science
Published
2026-09-10
DOI
https://doi.org/10.1126/science.adw4498
Citations
1
Primary Topic
Astro and Planetary Science
Type
article
Field-Weighted Citation Impact
4.32
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The parent bodies of Ryugu and Ivuna formed before those of other carbonaceous chondrites

Makiko K. Haba, Laurette Piani, Shigekazu Yoneda, Nicolas Dauphas et al.
1 citations
Science
Astro and Planetary Science
4.32
article

The parent bodies of Ryugu and Ivuna formed before those of other 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, Qing‐Zhu Yin, Ming‐Chang Liu, Kanako Sakamoto, Tommaso Di Rocco, Shoichi Itoh, Sei‐ichiro Watanabe, S. Amari, K. 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, Tomoki Nakamura, Sota Arakawa, 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, 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, Hisashi Homma, Kentaro Terada, T. Noguchi, Ai‐Cheng Zhang, Marc Chaussidon, Tsuyoshi Iizuka, Yuki Hibiya, C. M. O'd. Alexander, Akiko Miyazaki, Yasuko Terada, T. Kleine, Naoya Sakamoto, Kasumi Yogata, Kazuko Motomura, Richard W. Carlson, Satoshi Tanaka, Akira Ishikawa, Sohei Wada
article en
1 citations

Abstract

Most carbonaceous chondrite (CC) meteorites contain abundant chondrules, millimeter-scale spherical inclusions of previously molten material. Ivuna-type carbonaceous chondrites (CIs) do not contain chondrules, nor do samples of the carbonaceous asteroid Ryugu. CIs and Ryugu share isotopic properties distinct from those of other CCs, implying that their parent bodies formed at a different time or place than those of other CCs. We applied manganese-chromium dating and oxygen isotope thermometry to Ryugu and Ivuna samples. The results indicate that the parent bodies of Ryugu and Ivuna formed less than 2 million years after the beginning of Solar System formation—before the majority of chondrules in CCs and the parent bodies of other CCs formed. This implies that Ryugu and CIs are remnants of an earlier generation of carbonaceous planetesimals.

ScienceVol. 393(6816)
Hokkaido University of Science (JP), Hiroshima University (JP), University of Hawaiʻi at Mānoa (US), University of Copenhagen (DK), University of Science and Technology of China (CN), Lawrence Livermore National Laboratory (US), 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), Board of the Swiss Federal Institutes of Technology (CH), Japan Aerospace Exploration Agency (JP), Guangzhou Institute of Geochemistry (CN), Sorbonne Université (FR), University of Chicago (US), Korea Polar Research Institute (KR), Centre de Recherches Pétrographiques et Géochimiques (FR), Planetary Systems (United States) (US), Japan Synchrotron Radiation Research Institute (JP), Osaka Health Science University (JP), Rigaku (Japan) (JP), Max Planck Institute for Solar System Research (DE), Muséum national d'Histoire naturelle (FR), Institute of Space and Astronautical Science (JP), Johnson Space Center (US), National Museum of Nature and Science (JP), 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), University of Hong Kong (HK), The University of Osaka (JP)
Openalex Percentile: Top 4%
Astro and Planetary Science
4.32
DOISourceOpenAlex
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