globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1722265115
论文题名:
First evidence for silica condensation within the solar protoplanetary disk
作者: Komatsu M.; Fagan T.J.; Krot A.N.; Nagashima K.; Petaev M.I.; Kimura M.; Yamaguchi A.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:29
起始页码: 7497
结束页码: 7502
语种: 英语
英文关键词: Meteorites ; Protoplanetary disk ; Refractory inclusions
Scopus关键词: aluminosilicate calcium ; magnesium ; silicon ; silicon dioxide ; Article ; astronomy ; fractionation ; infrared spectroscopy ; polymerization ; prediction ; priority journal ; protoplanetary disk ; temperature measurement ; thermodynamics
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 (Δ17O ∼ −24) compositions, most likely near the protosun. Here we describe a16O-rich (Δ17O ∼ −22 ± 2) 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 -1,800 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 -10× 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. © 2018 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163689
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作者单位: Komatsu, M., Graduate University for Advanced Studies (SOKENDAI), Hayama, Kanagawa 240-0193, Japan, Department of Earth Sciences, Waseda University, Shinjuku, Tokyo 169-8050, Japan; Fagan, T.J., Department of Earth Sciences, Waseda University, Shinjuku, Tokyo 169-8050, Japan; Krot, A.N., Hawai‘i Institute of Geophysics and Planetology, School of Ocean, Earth Science and Technology, University of Hawai‘i at Manoa, Honolulu, HI 96822, United States; Nagashima, K., Hawai‘i Institute of Geophysics and Planetology, School of Ocean, Earth Science and Technology, University of Hawai‘i at Manoa, Honolulu, HI 96822, United States; Petaev, M.I., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States, Harvard–Smithsonian Center for Astrophysics, Cambridge, MA 02138, United States; Kimura, M., National Institute of Polar Research, Tachikawa, Tokyo, 190-8518, Japan, Ibaraki University, Mito, 310-8512, Japan; Yamaguchi, A., National Institute of Polar Research, Tachikawa, Tokyo, 190-8518, Japan, Department of Polar Science, School of Multidisciplinary Science, SOKENDAI, TachikawaTokyo 190-8518, Japan

Recommended Citation:
Komatsu M.,Fagan T.J.,Krot A.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,2018-01-01,115(29)
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