Year: 2023
Type: article
Abstract: Rock fragments of the Cb-type asteroid Ryugu returned to Earth by the JAXA Hayabusa2 mission share mineralogical, chemical, and isotopic properties with the Ivuna-type (CI) carbonaceous chondrites. Similar to CI chondrites, these fragments underwent extensive aqueous alteration and consist predominantly of hydrous minerals likely formed in the presence of liquid water on the Ryugu parent asteroid. Here we present an in situ analytical survey performed by secondary ion mass spectrometry from which we have estimated the D/H ratio of Ryugu’s hydrous minerals, D/H Ryugu , to be [165 ± 19] × 10 −6 , which corresponds to δ D Ryugu = +59 ± 121‰ (2 σ ). The hydrous mineral D/H Ryugu ’s values for the two sampling sites on Ryugu are similar; they are also similar to the estimated D/H ratio of hydrous minerals in the CI chondrites Orgueil and Alais. This result reinforces a link between Ryugu and CI chondrites and an inference that Ryugu’s samples, which avoided terrestrial contamination, are our best proxy to estimate the composition of water at the origin of hydrous minerals in CI-like material. Based on this data and recent literature studies, the contribution of CI chondrites to the hydrogen of Earth’s surficial reservoirs is evaluated to be ∼3%. We conclude that the water responsible for the alteration of Ryugu’s rocks was derived from water ice precursors inherited from the interstellar medium; the ice partially re-equilibrated its hydrogen with the nebular H 2 before being accreted on the Ryugu’s parent asteroid.
Authors: Laurette Piani, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Ken-ichi Bajo, Yoshinari Abe, Jérôme Aléon, Conel M. O’D. Alexander, Sachiko Amari, Yuri Amelin, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Shoichi Itoh, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Izumi Nakai, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Liping Qin, Sara S. Russell, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Tetsuya Yokoyama, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto
Institutions: Centre National de la Recherche Scientifique, Centre de Recherches Pétrographiques et Géochimiques, Université de Lorraine, University of Hawaiʻi at Mānoa, Hokkaido University, Institute for Integrated Innovations, Hokkaido University, Tokyo Denki University, Sorbonne Université, Muséum national d'Histoire naturelle, Institut de minéralogie, de physique des matériaux et de cosmochimie, Institut de Recherche pour le Développement, Carnegie Institution for Science, Earth and Planets Laboratory, Washington University in St. Louis, The University of Tokyo, Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, University of Copenhagen, University of Bayreuth, Institut de physique du globe de Paris, Université Paris Cité, Seoul National University, University of Chicago, University of Göttingen, Ibaraki University, Japan Aerospace Exploration Agency, Tokyo Institute of Technology, Nagoya University, Rigaku (Japan), Max Planck Institute for Chemistry, Horiba (Japan), The University of Queensland, Kyoto University, University of Wisconsin–Madison, Max Planck Institute for Solar System Research, University of California, Los Angeles, Tokyo University of Science, Johnson Space Center, Korea Polar Research Institute, University of Science and Technology of China, Natural History Museum, ETH Zurich, Institute of Geochemistry and Petrology, The University of Osaka, Japan Synchrotron Radiation Research Institute, Arizona State University, University of Maryland, College Park, Okayama University, University of California, Davis, National Museum of Nature and Science, Nanjing University, Tohoku University, Kyushu University, Hiroshima University, Kanagawa Institute of Technology, UTokyo Organization for Planetary and Space Science
Language: English
Topic: Astro and Planetary Science
Subfield: Space and Planetary Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,909
Awards: 軽元素及び重元素同位体イメージングが切り拓く新しい太陽系起源物質の評価方法, Understanding of the diversity of prebiotic chemistries and emergence of molecular systems in various planetary environments in the Solar System, High dynamic range quantitative imaging of hydrogen, The birth environment of the solar system constrained by niobium-92 in the refractory inclusion CAI, Distribution of HYdrogen in the protoplanetary Disk and deliveRy to the Terrestrial planEts, Planet formation process studied by refractory inclusion CAI : using noble gas isotopes as tracers, Dating of secondary minerals formed within carbonaceous planetesimals, From Protoplanetary Disks to the Solar System: Chemical Evolution of Organic Molecules, Meteoritic and theoretical studies on the origin of isotopic dichotomy in meteorites, Determination of carbon isotopic fractionation coefficieint between core and mantle, Multi-isotopic analyses of the samples returned from Ryugu: Toward the comprehensive understanding of the origin and formation history of C-type asteroids, G6991624444, The chemical composition of the asteroid Ryugu is determined by X-ray fluorescence analyses, Solar activities from pre-main-sequence stage to present, Re-building the early solar system and cosmo chronology based on the isotope heterogeneity in the protosolar disk, Investigating the origin of large projectiles by micro-sampling in the impact ejecta, Development of an infrared spectro-microtomography using a Mid-IR supercontinuum laser, Attempt to characterize the complex mixtures of hydrocarbons in meteorites that cannot be separated by conventional gas chromatography
OpenAlex ID: W4362667516