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Trace element concentrations in iron type cosmic spherules determined by the SR-XRF method
https://doi.org/10.15094/00005954
https://doi.org/10.15094/00005954b0dec437-39db-4f06-b4c7-9183902e945b
名前 / ファイル | ライセンス | アクション |
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KJ00000040946 (1.5 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1999-03-01 | |||||
タイトル | ||||||
タイトル | Trace element concentrations in iron type cosmic spherules determined by the SR-XRF method | |||||
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 | 10.15094/00005954 | |||||
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) |
Nozaki,Wataru
× Nozaki,Wataru× Nakamura,Tomoki× Iida,Atsuo× Matsuoka,Kenji× Takaoka,Nobuo |
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著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Sciences, Kyushu University/Department of Earth and Planetary Sciences, Kyushu University/Photon Factory Institute of Materials Structure Science, High Energy Accelerator Research Organization/Department of Earth and Planetary Sciences, Kyushu University/Department of Earth and Planetary Sciences, Kyushu University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The X-ray fluorescence method using synchrotron radiation (SR-XRF) was applied to determine trace element abundances in iron type (I-type) cosmic spherules collected at deep-sea sediments. Cr, Co, and Ni were detected from almost all spherules and average concentrations are 1336,2991ppm, and 4.0%, respectively. Ga, Ge, and Mn were detected from 20,30,and 20% of spherules and average concentrations are 4,4 and 486ppm, respectively. Spherules containing metallic cores were enriched in Ni and Co and depleted in volatile elements such as Ga and Ge relative to those without cores. The Ni and Co enrichments resulted from high concentrations of the elements in the metallic cores, while the Ga and Ge depletion might indicate that core-bearing spherules have experienced more severe heating during atmospheric entry than the core-lacking ones. On the basis of Mn concentration we divided spherules into two groups : high and low Mn groups. Trace element abundances of the low Mn group are systematically fractionated relative to those of iron meteorites : volatile elements are depleted and refractory ones are enriched in the spherules. This appears to be consistent with the hypothesis that I-type spherules are ablation products of iron meteorites that have lost volatile elements during melting. Production of the low Mn spherules by ablation of chondritic meteorites is also possible, but chondrite melting should have occurred under a limited range of oxygen fugacity in order to enrich Cr and remove Mn in the spherules. Spherules belonging to high Mn group show a complex trace element pattern when normalized to chondrites. A large Mn excess relative to Cr in this type of spherules can not be explained by any formation process, thus it is difficult to infer the precursor material of the Mn-rich spherules. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11182426 | |||||
書誌情報 |
Antarctic meteorite research 巻 12, p. 199-212, 発行日 1999-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |