Mineralogy and noble gas isotopes of micrometeorites collected from Antarctic snow

• 資料種別: 記事
• タイトル: Mineralogy and noble gas isotopes of micrometeorites collected from Antarctic snow
• 著者・編者: Ryuji Okazaki; Takaaki Noguchi; Shin-ichi Tsujimoto
• 出版事項: 日本 : Springer science+business media
• 出版年月日等: 2015-06-17
• 出版年（W3CDTF）: 2015-06-17
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 67(90)
• 掲載巻: 67(90)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-015-0261-8; https://doi.org/10.1186/s40623-015-0261-8
• 国立国会図書館永続的識別子: info:ndljp/pid/9497169; https://dl.ndl.go.jp/pid/9497169
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• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他; https://dl.ndl.go.jp/collections/B00035
• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2015-09-15T20:13:28+09:00
• 保存日（W3CDTF）: 2015-08-20
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• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: We have investigated seven micrometeorites (MMs) from Antarctic snow collected in 2003 and 2010 by means of electron microscopy, X-ray diffraction, micro-Raman spectroscopy, transmission electron microscopy (TEM) observation, and noble-gas isotope analysis. Isotopic ratios of He and Ne indicate that the noble gases in these MMs are mostly of solar wind (SW). Based on the release patterns of SW [4]He, which should reflect the degree of heating during atmospheric entry, the seven MMs were classified into three types including two least heated, three moderately heated, and two severely heated MMs. The heating degrees are well correlated to their mineralogical features determined by TEM observation. One of the least heated MMs is composed of phyllosilicates, whereas the other consists of anhydrous minerals within which solar flare tracks were observed. The two severely heated MMs show clear evidence of atmospheric heating such as partial melt of the uppermost surface layer in one and abundant patches of dendritic magnetite and Si-rich glass within an olivine grain in the other. It is noteworthy that a moderately heated MM composed of a single crystal of olivine has a [3]He/[4]He ratio of 8.44 × 10[−4], which is higher than the SW value of 4.64 × 10[−4], but does not show a cosmogenic [21]Ne signature such as [20]Ne/[21]Ne/[22]Ne = 12.83/0.0284/1. The isotopic compositions of He and Ne in this sample cannot be explained by mixing of a galactic cosmic ray (GCR)-produced component and SW gases. The high [3]He/[4]He ratio without cosmogenic [21]Ne signature likely indicates the presence of a [3]He-enriched component derived from solar energetic particles.
• DOI: 10.1186/s40623-015-0261-8; https://doi.org/10.1186/s40623-015-0261-8
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © 2015 Okazaki et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
• 関連情報（URI）: http://hdl.handle.net/2433/212437; https://hiroshima.repo.nii.ac.jp/records/2006785; http://id.ndl.go.jp/digimeta/9497169; https://dl.ndl.go.jp/pid/9497169; http://link.springer.com/content/pdf/10.1186/s40623-015-0261-8.pdf; http://link.springer.com/article/10.1186/s40623-015-0261-8/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-015-0261-8
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• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
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• 書誌ID（NDLBibID）: 9497169; http://id.ndl.go.jp/bib/9497169
• NII論文ID: 120005758189; 120006800830