Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu
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- 吉村, 寿紘
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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- 荒岡, 大輔
- Geological Survey of Japan (GSJ), National Institute of Advanced Industrial Science and Technology (AIST)
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- 奈良岡, 浩
- Department of Earth and Planetary Sciences, Kyushu University
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- 坂井, 三郎
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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- 小川, 奈々子
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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- 圦本, 尚義
- Creative Research Institution (CRIS), Hokkaido University
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- 森田, 麻由
- HORIBA Techno Service Co., Ltd.
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- 小野瀬, 森彦
- HORIBA Techno Service Co., Ltd.
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- 横山, 哲也
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology
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- ビッツァーロ, マーティン
- Centre for Star and Planet Formation, Globe Institute, University of Copenhagen
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- 田中, 悟
- HORIBA Techno Service Co., Ltd.
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- 大河内, 直彦
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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- 古賀, 俊貴
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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- ドワーキン, ジェイソン
- Solar System Exploration Division, NASA Goddard Space Flight Center
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- 中村, 智樹
- Department of Earth Science, Tohoku University
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- 野口, 高明
- Department of Earth and Planetary Sciences, Kyoto University
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- 岡崎, 隆司
- Department of Earth and Planetary Sciences, Kyushu University
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- 薮田, ひかる
- Earth and Planetary Systems Science Program, Hiroshima University
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- 坂本, 佳奈子
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 矢田, 達
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 西村, 征洋
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 中藤, 亜衣子
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 宮﨑, 明子
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 与賀田, 佳澄
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 安部, 正真
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 岡田, 達明
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 臼井, 寛裕
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 吉川, 真
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 佐伯, 孝尚
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 田中, 智
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 照井, 冬人
- Kanagawa Institute of Technology
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- 中澤, 暁
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 渡邊, 誠一郎
- Department of Earth and Planetary Sciences, Nagoya University
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- 津田, 雄一
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)
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- 橘, 省吾
- Institute of Space and Astro-nautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA); UTokyo Organization for Planetary and Space Science (UTOPS), University of Tokyo
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- 高野, 淑識
- Biogeochemistry Research Center (BGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
説明
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.
収録刊行物
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- Nature Communications
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Nature Communications 15 2024-09-05
Springer Nature
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詳細情報 詳細情報について
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- CRID
- 1050302315064391808
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- ISSN
- 20411723
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- HANDLE
- 2433/290504
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
