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Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu

Author

Listed:
  • Toshihiro Yoshimura

    (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

  • Daisuke Araoka

    (National Institute of Advanced Industrial Science and Technology (AIST))

  • Hiroshi Naraoka

    (Kyushu University)

  • Saburo Sakai

    (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

  • Nanako O. Ogawa

    (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

  • Hisayoshi Yurimoto

    (Hokkaido University)

  • Mayu Morita

    (Kisshoin)

  • Morihiko Onose

    (Kisshoin)

  • Tetsuya Yokoyama

    (Tokyo Institute of Technology, Ookayama)

  • Martin Bizzarro

    (University of Copenhagen)

  • Satoru Tanaka

    (Kisshoin)

  • Naohiko Ohkouchi

    (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

  • Toshiki Koga

    (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

  • Jason P. Dworkin

    (NASA Goddard Space Flight Center)

  • Tomoki Nakamura

    (Tohoku University)

  • Takaaki Noguchi

    (Kyoto University)

  • Ryuji Okazaki

    (Kyushu University)

  • Hikaru Yabuta

    (Hiroshima University)

  • Kanako Sakamoto

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Toru Yada

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Masahiro Nishimura

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Aiko Nakato

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Akiko Miyazaki

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Kasumi Yogata

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Masanao Abe

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Tatsuaki Okada

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Tomohiro Usui

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Makoto Yoshikawa

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Takanao Saiki

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Satoshi Tanaka

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Fuyuto Terui

    (Kanagawa Institute of Technology)

  • Satoru Nakazawa

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Sei-ichiro Watanabe

    (Nagoya University)

  • Yuichi Tsuda

    (Japan Aerospace Exploration Agency (ISAS/JAXA))

  • Shogo Tachibana

    (Japan Aerospace Exploration Agency (ISAS/JAXA)
    University of Tokyo)

  • Yoshinori Takano

    (Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

Abstract

Returned samples from the carbonaceous asteroid (162173) Ryugu provide pristine information on the original aqueous alteration history of the Solar System. Secondary precipitates, such as carbonates and phyllosilicates, reveal elemental partitioning of the major component ions linked to the primordial brine composition of the asteroid. Here, we report on the elemental partitioning and Mg isotopic composition (25Mg/24Mg) of breunnerite [(Mg, Fe, Mn)CO3] from the Ryugu C0002 sample and the A0106 and C0107 aggregates by sequential leaching extraction of salts, exchangeable ions, carbonates, and silicates. Breunnerite was the sample most enriched in light Mg isotopes, and the 25Mg/24Mg value of the fluid had shifted lower by ~0.38‰ than the initial value (set to 0‰) before dolomite precipitation. As a simple model, the Mg2+ first precipitated in phyllosilicates, followed by dolomite precipitation, at which time ~76−87% of Mg2+ had been removed from the primordial brine. A minor amount of phyllosilicate precipitation continued after dolomite precipitation. The element composition profiles of the latest solution that interacted with the cation exchange pool of Ryugu were predominantly Na-rich. Na+ acts as a bulk electrolyte and contributes to the stabilization of the negative surface charge of phyllosilicates and organic matter on Ryugu.

Suggested Citation

  • Toshihiro Yoshimura & Daisuke Araoka & Hiroshi Naraoka & Saburo Sakai & Nanako O. Ogawa & Hisayoshi Yurimoto & Mayu Morita & Morihiko Onose & Tetsuya Yokoyama & Martin Bizzarro & Satoru Tanaka & Naohi, 2024. "Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50814-y
    DOI: 10.1038/s41467-024-50814-y
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    References listed on IDEAS

    as
    1. Wataru Fujiya & Naoji Sugiura & Hideyuki Hotta & Koji Ichimura & Yuji Sano, 2012. "Evidence for the late formation of hydrous asteroids from young meteoritic carbonates," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    2. 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.
    3. Philippe Schmitt-Kopplin & Norbert Hertkorn & Mourad Harir & Franco Moritz & Marianna Lucio & Lydie Bonal & Eric Quirico & Yoshinori Takano & Jason P. Dworkin & Hiroshi Naraoka & Shogo Tachibana & Tom, 2023. "Soluble organic matter Molecular atlas of Ryugu reveals cold hydrothermalism on C-type asteroid parent body," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    4. Toshihiro Yoshimura & Yoshinori Takano & Hiroshi Naraoka & Toshiki Koga & Daisuke Araoka & Nanako O. Ogawa & Philippe Schmitt-Kopplin & Norbert Hertkorn & Yasuhiro Oba & Jason P. Dworkin & José C. Apo, 2023. "Chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 Ryugu," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
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