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The evolution of chondrules
https://doi.org/10.15094/00004484
https://doi.org/10.15094/0000448407e14243-e2fc-4e9f-bcec-0f5f69810fa3
名前 / ファイル | ライセンス | アクション |
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KJ00000036290 (2.7 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1989-10-01 | |||||
タイトル | ||||||
タイトル | The evolution of chondrules | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00004484 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Hewins, Roger H.
× Hewins, Roger H. |
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著者所属(英) | ||||||
en | ||||||
Department of Geological Sciences, Rutgers University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The range of olivine compositions forming anomalous inclusions in chondrules suggests fractional condensation, as does the sequence of minerals in fine matrix particles. Chondrule bulk compositions vary in a random way as the precursors (condensates) were assembled heterogeneously. Chondrule heating and cooling were moderately rapid, and at high oxygen fugacities, suggesting processing in a localized particle-rich clump in the nebula. Rims deposited on chondrules show that condensation continued after chondrule formation. The hot particle-rich clump slows radiative cooling of chondrules, allows condensation, provides high oxygen fugacity as a result of evaporation and generates the collisions needed to fragment chondrules. The simultaneous evaporation/condensation and melting/crystallization are explained by pressure gradients in the clump. In the thickest parts of the clump, high vapor pressure allows melting, but at the outside evaporation and condensation would proceed. The observation that round chondrules are more magnesian and fragments are more ferroan is similarly consistent with formation in outer low-pressure reduced regions and the thick clump center, respectively. Turbulent migrations of condensates in and out of such clumps would explain the random nature of precursor compositions, while evaporation and gas dissipation would explain changes in oxygen fugacity which chondrules record plus their shape-redox relationship. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10784627 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites 巻 2, p. 200-220, 発行日 1989-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |