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Magnetic microsperules in Permian and Triassic bedded chert from Southwest Japan
https://doi.org/10.15094/00004558
https://doi.org/10.15094/0000455832352e7d-9834-49e9-b7de-eee0f70e278a
名前 / ファイル | ライセンス | アクション |
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KJ00000036364 (1.7 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1991-03-01 | |||||
タイトル | ||||||
タイトル | Magnetic microsperules in Permian and Triassic bedded chert from Southwest Japan | |||||
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 | 10.15094/00004558 | |||||
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) |
Iwahashi,Junko
× Iwahashi,Junko× Yoshida,Masaru× Miono,Shigeyoshi× Santosh,Geetha× Santosh,M. |
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著者所属(英) | ||||||
en | ||||||
Geographical Survey Institute, Ministry of Construction/Faculty of Science, Osaka City University/Faculty of Science, Osaka City University/ Faculty of Science, Osaka City University/Faculty of Science, Osaka City University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Magnetic microspherules collected from the Permian and Triassic bedded cherts in Southwest Japan were studied. The size range, as estimated from 801 microspherules, vary from 3 to 100μm, with a peak size distribution between 10-20μm. Three broad shapes are recognized : spherical-, drop- and rocket-shaped, all categories including hollow particles. The surface textures as studied from scanning electron microscope show five dominant varieties : random mosaic, dendritic mosaic, feather crystal, scaly and cracked, with intermediate textures between these types. Chemical analyses of representative microspherules by electron microprobe indicate that they are mostly composed of magnetite, resembling in composition with microspherules of cosmic origin from other regions and magnetite grains in carbonaceous chondrites. Consideration of the origin of the observed morphologic, textural and chemical parameters in these microspherules, along with the available data on experimental synthesis of ultramicro iron particles, preclude an origin by volcanogenic processes and strongly suggest a cosmic origin. Knowledge of the rate of chert sedimentation allows us to make an empirical calculation on the rate of microspherule sedimentation. We compute that the fall of microspherules on the earth's surface occurred at the rate of about 1 t/day during Permian, while it increased to about 3 t/day during the closing of the era and the Triassic. | |||||
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 4, p. 420-435, 発行日 1991-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |