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

Author

Listed:
  • 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))

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 (

Suggested Citation

  • 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 & Mas, 2023. "Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36268-8
    DOI: 10.1038/s41467-023-36268-8
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