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

Toshihiro Yoshimura (), Daisuke Araoka, Hiroshi Naraoka, Saburo Sakai, Nanako O. Ogawa, Hisayoshi Yurimoto, Mayu Morita, Morihiko Onose, Tetsuya Yokoyama, Martin Bizzarro, Satoru Tanaka, Naohiko Ohkouchi, Toshiki Koga, Jason P. Dworkin, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana and Yoshinori Takano ()
Additional contact information
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)
Yoshinori Takano: Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-50814-y

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