Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials

Daisuke Nakashima (), Tomoki Nakamura, Mingming Zhang, Noriko T. Kita, Takashi Mikouchi, Hideto Yoshida, Yuma Enokido, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Fuyuto Terui, Hisayoshi Yurimoto, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Sei-ichiro Watanabe, Shogo Tachibana and Yuichi Tsuda
Additional contact information
Daisuke Nakashima: Tohoku University
Tomoki Nakamura: Tohoku University
Mingming Zhang: University of Wisconsin-Madison
Noriko T. Kita: University of Wisconsin-Madison
Takashi Mikouchi: University of Tokyo
Hideto Yoshida: University of Tokyo
Yuma Enokido: Tohoku University
Tomoyo Morita: Tohoku University
Mizuha Kikuiri: Tohoku University
Kana Amano: Tohoku University
Eiichi Kagawa: Tohoku University
Toru Yada: Japan Aerospace Exploration Agency (JAXA)
Masahiro Nishimura: Japan Aerospace Exploration Agency (JAXA)
Aiko Nakato: Japan Aerospace Exploration Agency (JAXA)
Akiko Miyazaki: Japan Aerospace Exploration Agency (JAXA)
Kasumi Yogata: Japan Aerospace Exploration Agency (JAXA)
Masanao Abe: Japan Aerospace Exploration Agency (JAXA)
Tatsuaki Okada: Japan Aerospace Exploration Agency (JAXA)
Tomohiro Usui: Japan Aerospace Exploration Agency (JAXA)
Makoto Yoshikawa: Japan Aerospace Exploration Agency (JAXA)
Takanao Saiki: Japan Aerospace Exploration Agency (JAXA)
Satoshi Tanaka: Japan Aerospace Exploration Agency (JAXA)
Satoru Nakazawa: Japan Aerospace Exploration Agency (JAXA)
Fuyuto Terui: Kanagawa Institute of Technology
Hisayoshi Yurimoto: Hokkaido University
Takaaki Noguchi: Kyoto University
Hikaru Yabuta: Hiroshima University
Hiroshi Naraoka: Kyushu University
Ryuji Okazaki: Kyushu University
Kanako Sakamoto: Japan Aerospace Exploration Agency (JAXA)
Sei-ichiro Watanabe: Nagoya University
Shogo Tachibana: University of Tokyo
Yuichi Tsuda: Japan Aerospace Exploration Agency (JAXA)

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Chondrule-like objects and Ca-Al-rich inclusions (CAIs) are discovered in the retuned samples from asteroid Ryugu. Here we report results of oxygen isotope, mineralogical, and compositional analysis of the chondrule-like objects and CAIs. Three chondrule-like objects dominated by Mg-rich olivine are 16O-rich and -poor with Δ17O (=δ17O – 0.52 × δ18O) values of ~ –23‰ and ~ –3‰, resembling what has been proposed as early generations of chondrules. The 16O-rich objects are likely to be melted amoeboid olivine aggregates that escaped from incorporation into 16O-poor chondrule precursor dust. Two CAIs composed of refractory minerals are 16O-rich with Δ17O of ~ –23‰ and possibly as old as the oldest CAIs. The discovered objects (

Date: 2023
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Citations: View citations in EconPapers (2)

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DOI: 10.1038/s41467-023-36268-8

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