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

• 成果类型: Article
• 署名作者: Kawasaki, Noriyuki; Nagashima, Kazuhide; Sakamoto, Naoya; Fujiya, Wataru; Arakawa, Sota; Bajo, Ken-ichi; Kita, Noriko T.; Kitajima, Kouki; Krot, Alexander N.; Huss, Gary R.; Abe, Yoshinari; Aleon, Jerome; Alexander, Conel M. O'D.; Amari, Sachiko; Amelin, Yuri; Bizzarro, Martin; Bouvier, Audrey; Carlson, Richard W.; Chaussidon, Marc; Choi, Byeon-Gak; Dauphas, Nicolas; Davis, Andrew M.; Di Rocco, Tommaso; Fukai, Ryota; Gautam, Ikshu; Haba, Makiko K.; Hibiya, Yuki; Hidaka, Hiroshi; Homma, Hisashi; Iizuka, Tsuyoshi; Ireland, Trevor R.; Ishikawa, Akira; Itoh, Shoichi; Kleine, Thorsten; Komatani, Shintaro; Liu, Ming-Chang; Masuda, Yuki; Motomura, Kazuko; Moynier, Frederic; Nakai, Izumi; Nguyen, Ann; Nittler, Larry; Pack, Andreas; Park, Changkun; Piani, Laurette; Qin, Liping; Russell, Sara S.; Schonbachler, Maria; Terada, Kentaro; Terada, Yasuko; Usui, Tomohiro; Wada, Sohei; Wadhwa, Meenakshi; Walker, Richard J.; Yamashita, Katsuyuki; Yin, Qing-Zhu; Yokoyama, Tetsuya; Yoneda, Shigekazu; Young, Edward D.; Yui, Hiroharu; Zhang, Ai-Cheng; Nakamura, Tomoki; Naraoka, Hiroshi; Noguchi, Takaaki; Okazaki, Ryuji; Sakamoto, Kanako; Yabuta, Hikaru; Abe, Masanao; Miyazaki, Akiko; Nakato, Aiko; Nishimura, Masahiro; Okada, Tatsuaki; Yada, Toru; Yogata, Kasumi; Nakazawa, Satoru; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Tsuda, Yuichi; Watanabe, Sei-ichiro; Yoshikawa, Makoto; Tachibana, Shogo; Yurimoto, Hisayoshi
• 署名单位: Hokkaido University; University of Hawaii System; University of Hawaii Manoa; Hokkaido University; Ibaraki University; Japan Agency for Marine-Earth Science & Technology (JAMSTEC); University of Wisconsin System; University of Wisconsin Madison; Tokyo Denki University; Museum National d'Histoire Naturelle (MNHN); Sorbonne Universite; Washington University (WUSTL); Washington University (WUSTL); Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; University of Copenhagen; University of Bayreuth; Universite Paris Cite; Seoul National University (SNU); University of Chicago; University of Hong Kong; University of Gottingen; Japan Aerospace Exploration Agency (JAXA); Institute of Space & Astronautical Science (ISAS); Institute of Science Tokyo; University of Tokyo; Japan Agency for Marine-Earth Science & Technology (JAMSTEC); Nagoya University; Rigaku Corporation; University of Tokyo; University of Queensland; Kyoto University; Max Planck Society; University of California System; University of California Los Angeles; United States Department of Energy (DOE); Lawrence Livermore National Laboratory; Rigaku Corporation; Tokyo University of Science; National Aeronautics & Space Administration (NASA); NASA Johnson Space Center; Korea Polar Research Institute (KOPRI); Universite de Lorraine; Centre National de la Recherche Scientifique (CNRS); Chinese Academy of Sciences; University of Science & Technology of China, CAS; Natural History Museum London; University of Osaka; Japan Synchrotron Radiation Research Institute; Arizona State University; Arizona State University-Tempe; University System of Maryland; University of Maryland College Park; Okayama University; University of California System; University of California Davis; National Museum of Nature and Science; Tokyo University of Science; Nanjing University; Tohoku University; Kyushu University; Hiroshima University; Kanagawa Institute Technology; University of Tokyo
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.adw4498
• 发表日期: 2026-09-10
• 页码: 1117-1121
• 关键词: oxygen-isotope fractionation; PROGRESSIVE AQUEOUS ALTERATION; CHONDRULE FORMATION; systematics; ALLENDE; water; distinct; AL-26-MG-26; meteorites; chronology

摘要

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.