Nature Communications (Sep 2024)
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,
- Yoshinori Takano
Affiliations
- Toshihiro Yoshimura
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
- Daisuke Araoka
- Geological Survey of Japan (GSJ), National Institute of Advanced Industrial Science and Technology (AIST)
- Hiroshi Naraoka
- Department of Earth and Planetary Sciences, Kyushu University
- Saburo Sakai
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
- Nanako O. Ogawa
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
- Hisayoshi Yurimoto
- Creative Research Institution (CRIS), Hokkaido University
- Mayu Morita
- HORIBA Techno Service Co., Ltd., Kisshoin
- Morihiko Onose
- HORIBA Techno Service Co., Ltd., Kisshoin
- Tetsuya Yokoyama
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Ookayama
- Martin Bizzarro
- Centre for Star and Planet Formation, Globe Institute, University of Copenhagen
- Satoru Tanaka
- HORIBA Techno Service Co., Ltd., Kisshoin
- Naohiko Ohkouchi
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
- Toshiki Koga
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
- Jason P. Dworkin
- Solar System Exploration Division, NASA Goddard Space Flight Center
- Tomoki Nakamura
- Department of Earth Science, Tohoku University
- Takaaki Noguchi
- Department of Earth and Planetary Sciences, Kyoto University
- Ryuji Okazaki
- Department of Earth and Planetary Sciences, Kyushu University
- Hikaru Yabuta
- Earth and Planetary Systems Science Program, Hiroshima University
- Kanako Sakamoto
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Toru Yada
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Masahiro Nishimura
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Aiko Nakato
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Akiko Miyazaki
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Kasumi Yogata
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Masanao Abe
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Tatsuaki Okada
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Tomohiro Usui
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Makoto Yoshikawa
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Takanao Saiki
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Satoshi Tanaka
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Fuyuto Terui
- Kanagawa Institute of Technology
- Satoru Nakazawa
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Sei-ichiro Watanabe
- Department of Earth and Planetary Sciences, Nagoya University
- Yuichi Tsuda
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Shogo Tachibana
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
- Yoshinori Takano
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
- DOI
- https://doi.org/10.1038/s41467-024-50814-y
- Journal volume & issue
-
Vol. 15,
no. 1
pp. 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.
