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Formation processes of magnetic spherules collected from deep-sea sediments -Observations and numerical simulations of the orbital evolution-
https://doi.org/10.15094/00004710
https://doi.org/10.15094/00004710d906846a-a77e-48c9-b157-2a58fb8d8976
名前 / ファイル | ライセンス | アクション |
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KJ00000036516 (2.3 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1996-03-01 | |||||
タイトル | ||||||
タイトル | Formation processes of magnetic spherules collected from deep-sea sediments -Observations and numerical simulations of the orbital evolution- | |||||
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 | 10.15094/00004710 | |||||
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) |
Yada,Toru
× Yada,Toru× Nakamura,Tomoki× Sekiya,Minoru× Takaoka,Nobuo |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University/Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University/Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University/Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Spherules collected from deep-sea sediments were analyzed for major chemical compositions and examined for textural relationships. Two main types of internal texture are observed in Ni-bearing I-type spherules : spherules with Ni-free Fe-oxide mantle and Fe-Ni metallic cores and Fe-Ni oxide spherules without metallic cores. Cores are often observed off-centered. S-type spherules show porphyritic, barred, and fine-grained types of texture. Relict olivine grains are found in some porphyritic S-type spherules. A cooling rate of 55℃/s was calculated for one of these grains based on chemical zonal patterns. For I-type spherules, numerical simulations were performed to constrain the relationship between temperatures, radii of spherules, and the apparent gravitational acceleration with the spherule as a stationary frame of reference. Results indicate that a) spherules lose most of their original mass by evaporation over 1900℃, and, b) the apparent gravitational acceleration is at a maximum during the last stage of evaporation. Based on the observations and numerical simulations of I-type spherules, we propose the following model for their formation : during ablation, the metallic core is off-centered, a surface of the core is then exposed to the air due to the strong apparent gravitational acceleration and, finally, oxidation reactions can proceed on the exposed core surface. | |||||
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 9, p. 218-236, 発行日 1996-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |