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

被引：1

作者：

Yoshimura, Toshihiro ^{[1
]}

Araoka, Daisuke ^{[2
]}

Naraoka, Hiroshi ^{[3
]}

Sakai, Saburo ^{[1
]}

Ogawa, Nanako O. ^{[1
]}

Yurimoto, Hisayoshi ^{[4
]}

Morita, Mayu ^{[5
]}

Onose, Morihiko ^{[5
]}

Yokoyama, Tetsuya ^{[6
]}

Bizzarro, Martin ^{[7
]}

Tanaka, Satoru ^{[5
]}

Ohkouchi, Naohiko ^{[1
]}

Koga, Toshiki ^{[1
]}

Dworkin, Jason P. ^{[8
]}

Nakamura, Tomoki ^{[9
]}

Noguchi, Takaaki ^{[10
]}

Okazaki, Ryuji ^{[3
]}

Yabuta, Hikaru ^{[11
]}

Sakamoto, Kanako ^{[12
]}

Yada, Toru ^{[12
]}

Nishimura, Masahiro ^{[12
]}

Nakato, Aiko ^{[12
]}

Miyazaki, Akiko ^{[12
]}

Yogata, Kasumi ^{[12
]}

Abe, Masanao ^{[12
]}

Okada, Tatsuaki ^{[12
]}

Usui, Tomohiro ^{[12
]}

Yoshikawa, Makoto ^{[12
]}

Saiki, Takanao ^{[12
]}

Tanaka, Satoshi ^{[12
]}

Terui, Fuyuto ^{[13
]}

Nakazawa, Satoru ^{[12
]}

Watanabe, Sei-ichiro ^{[14
]}

Tsuda, Yuichi ^{[12
]}

Tachibana, Shogo ^{[12
,15
]}

Takano, Yoshinori ^{[1
]}

机构：

[1] Japan Agcy Marine Earth Sci & Technol JAMSTEC, Biogeochem Res Ctr BGC, Natsushima 2-15, Yokosuka, Kanagawa 2370061, Japan

[2] Natl Inst Adv Ind Sci & Technol, Geol Survey Japan GSJ, 1-1-1 Higashi, Tsukuba, Ibaraki 3058567, Japan

[3] Kyushu Univ, Dept Earth & Planetary Sci, 744 Motooka,Nishi Ku, Fukuoka 8190395, Japan

[4] Hokkaido Univ, Creat Res Inst CRIS, Sapporo, Hokkaido 0010021, Japan

[5] HORIBA Techno Serv Co Ltd, Minami Ku, Kisshoin, Kyoto 6018510, Japan

[6] Tokyo Inst Technol, Dept Earth & Planetary Sci, 2-12-1 Ookayama, Meguro, Tokyo 1528551, Japan

[7] Univ Copenhagen, Ctr Star & Planet Format, Globe Inst, DK-1350 Copenhagen, Denmark

[8] NASA, Solar Syst Explorat Div, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[9] Tohoku Univ, Dept Earth Sci, Sendai 9808678, Japan

[10] Kyoto Univ, Dept Earth & Planetary Sci, Kyoto 6068502, Japan

[11] Hiroshima Univ, Earth & Planetary Syst Sci Program, Higashihiroshima 7398526, Japan

[12] Japan Aerosp Explorat Agcy ISAS JAXA, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan

[13] Kanagawa Inst Technol, Atsugi 2430292, Japan

[14] Nagoya Univ, Dept Earth & Planetary Sci, Nagoya 4648601, Japan

[15] Univ Tokyo, UTokyo Org Planetary & Space Sci UTOPS, Bunkyo Ku, Tokyo 1130033, Japan

来源：

NATURE COMMUNICATIONS | 2024年 / 15卷 / 01期

基金：

日本学术振兴会; 美国国家航空航天局;

关键词：

TAGISH LAKE; MG ISOTOPES; MINERALOGY; CI; SYSTEM; DISSOLUTION; CHONDRITES; BEHAVIOR; HISTORY;

D O I：

10.1038/s41467-024-50814-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 (Mg-25/Mg-24) 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 Mg-25/Mg-24 value of the fluid had shifted lower by similar to 0.38 parts per thousand than the initial value (set to 0 parts per thousand) before dolomite precipitation. As a simple model, the Mg2+ first precipitated in phyllosilicates, followed by dolomite precipitation, at which time similar to 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.

引用

页数：13