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DOI | 10.1073/pnas.1722265115 |
First evidence for silica condensation within the solar protoplanetary disk | |
Komatsu, Mutsumi1,2; Fagan, Timothy J.2; Krot, Alexander N.3; Nagashima, Kazuhide3; Petaev, Michail I.4,5; Kimura, Makoto6,7; Yamaguchi, Akira6,8 | |
2018-07-17 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:29页码:7497-7502 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; USA |
英文摘要 | Calcium-aluminum-rich inclusions (CAIs) and amoeboid olivine aggregates (AOAs), a refractory component of chondritic meteorites, formed in a high-temperature region of the protoplanetary disk characterized by approximately solar chemical and oxygen isotopic (Delta(17) O similar to -24 parts per thousand) compositions, most likely near the protosun. Here we describe a O-16-rich (Delta O-17 similar to -22 +/- 2 parts per thousand) AOA from the carbonaceous Renazzo-type (CR) chondrite Yamato-793261 containing both (i) an ultrarefractory CAI and (ii) forsterite, low-Ca pyroxene, and silica, indicating formation by gas-solid reactions over a wide temperature range from similar to 1,800 to similar to 1,150 K. This AOA provides direct evidence for gas-solid condensation of silica in a CAI/AOA-forming region. In a gas of solar composition, the Mg/Si ratio exceeds 1, and, therefore, silica is not predicted to condense under equilibrium conditions, suggesting that the AOA formed in a parcel of gas with fractionated Mg/Si ratio, most likely due to condensation of forsterite grains. Thermodynamic modeling suggests that silica formed by condensation of nebular gas depleted by similar to 10x in H and He that cooled at 50 K/hour at total pressure of 10(-4) bar. Condensation of silica from a hot, chemically fractionated gas could explain the origin of silica identified from infrared spectroscopy of remote protostellar disks. |
英文关键词 | protoplanetary disk refractory inclusions meteorites |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438892600049 |
WOS关键词 | CR CARBONACEOUS CHONDRITES ; ORGANIC-MATTER ; ULTRAREFRACTORY INCLUSION ; PRIMITIVE METEORITES ; ISOTOPIC COMPOSITION ; AQUEOUS ALTERATION ; OXYGEN ISOTOPES ; CV3 CHONDRITES ; CO CHONDRITES ; OLIVINE |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204953 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Grad Univ Adv Studies SOKENDAI, Hayama, Kanagawa 2400193, Japan; 2.Waseda Univ, Dept Earth Sci, Shinjuku Ku, Tokyo 1698050, Japan; 3.Univ Hawaii Manoa, Hawai Inst Geophys & Planetol, Sch Ocean Earth Sci & Technol, Honolulu, HI 96822 USA; 4.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA; 5.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA; 6.Natl Inst Polar Res, Tachikawa, Tokyo 1908518, Japan; 7.Ibaraki Univ, Mito, Ibaraki 3108512, Japan; 8.SOKENDAI, Sch Multidisciplinary Sci, Dept Polar Sci, Tachikawa, Tokyo 1908518, Japan |
推荐引用方式 GB/T 7714 | Komatsu, Mutsumi,Fagan, Timothy J.,Krot, Alexander N.,et al. First evidence for silica condensation within the solar protoplanetary disk[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(29):7497-7502. |
APA | Komatsu, Mutsumi.,Fagan, Timothy J..,Krot, Alexander N..,Nagashima, Kazuhide.,Petaev, Michail I..,...&Yamaguchi, Akira.(2018).First evidence for silica condensation within the solar protoplanetary disk.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(29),7497-7502. |
MLA | Komatsu, Mutsumi,et al."First evidence for silica condensation within the solar protoplanetary disk".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.29(2018):7497-7502. |
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