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The abundances of indigenous nitrogen in these eucrites are from 0.05 to 1.3ppm, much lower than that in ordinary chondrites. The less abundance of nitrogen for eucrites is due to thermal events on the parent body. Isotopic ratios of the trapped nitrogen are also considered. Contribution of terrestrial nitrogen (δ^\u003c15\u003eN from 0‰ to +20‰) and cosmogenic nitrogen (δ^\u003c15\u003eN\u003e+100‰) is significant in the case of eucrites at low temperature (\u003c600℃) and high temperature (\u003e1000℃) fractions, respectively. Hence, nitrogen released at medium temperature fractions is considered. The observed minimum δ^\u003c15\u003eN values released in medium temperature fractions of Y-792510 and Camel Donga are -54‰ and -18‰, respectively. The low δ^\u003c15\u003eN values cannot be explained by contribution of the terrestrial and cosmogenic components. 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Nitrogen isotopic compositions in three Antarctic and two non-Antarctic eucrites
https://doi.org/10.15094/00004618
https://doi.org/10.15094/00004618091afa51-eec8-4545-abb1-8034ca2168eb
名前 / ファイル | ライセンス | アクション |
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KJ00000036424 (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 | 1993-05-01 | |||||
タイトル | ||||||
タイトル | Nitrogen isotopic compositions in three Antarctic and two non-Antarctic eucrites | |||||
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 | 10.15094/00004618 | |||||
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) |
Miura,Yayoi
× Miura,Yayoi× Sugiura,Naoji |
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著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Physics, Faculty of Science, University of Tokyo/Department of Earth and Planetary Physics, Faculty of Science, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Nitrogen isotopic compositions were determined with stepped combustion method for three Antarctic eucrites (Allan Hills-76005,Yamato (Y)-792510 and -82066) and two non-Antarctic eucrites (Juvinas and Camel Donga). The abundances of indigenous nitrogen in these eucrites are from 0.05 to 1.3ppm, much lower than that in ordinary chondrites. The less abundance of nitrogen for eucrites is due to thermal events on the parent body. Isotopic ratios of the trapped nitrogen are also considered. Contribution of terrestrial nitrogen (δ^<15>N from 0‰ to +20‰) and cosmogenic nitrogen (δ^<15>N>+100‰) is significant in the case of eucrites at low temperature (<600℃) and high temperature (>1000℃) fractions, respectively. Hence, nitrogen released at medium temperature fractions is considered. The observed minimum δ^<15>N values released in medium temperature fractions of Y-792510 and Camel Donga are -54‰ and -18‰, respectively. The low δ^<15>N values cannot be explained by contribution of the terrestrial and cosmogenic components. This is strong evidence for existence of trapped components in eucrites which have ^<15>N/^<14>N ratios different from the atmospheric value. Since there may be some contribution of terrestrial or cosmogenic nitrogen even at medium temperature fractions, the minimum values observed in the present work should be considered as upper limits for the trapped components. | |||||
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 6, p. 338-356, 発行日 1993-05 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |