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Calculation of radiogenic 26Mg of CAI minerals under high precision isotope measurement by SIMS

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タイトル: Calculation of radiogenic 26Mg of CAI minerals under high precision isotope measurement by SIMS
著者: Itoh, Shoichi 著作を一覧する
Makide, Kentaro 著作を一覧する
Yurimoto, Hisayoshi 著作を一覧する
キーワード: SIMS
Magnesium
Al-Mg isochron
Multi-collector
Instrumental mass fractionation
CAI
発行日: 2008年12月15日
出版者: Elsevier B.V.
誌名: Applied Surface Science
巻: 255
号: 4
開始ページ: 1476
終了ページ: 1478
出版社 DOI: 10.1016/j.apsusc.2008.05.054
抄録: High precision Mg isotope measurements have been performed to determine radiogenic 26Mg of CAI minerals by secondary ion mass spectrometry using faraday cup multi-collection system. Terrestrial samples of spinel and augite, and synthetic glasses of melilite and fassaite, were prepared to correct instrumental mass fractionation. Reproducibility of Mg isotope measurements for each standard were limited to ~0.4‰ (2σ). On the other hand, the standard errors for one spot are ~0.05‰ (2σ). The poor reproducibility resulted from variations of instrumental mass fractionation among individual measurement spots. We propose novel calculation method of radiogenic 26Mg considering instrumental and natural mass fractionation for each mineral. The overall measurement error of radiogenic 26Mg of the minerals can be calculated less than 0.2‰ (2σ). This provides that the time resolution of early solar system chronometer was improved up to 100kyr for ~20 micrometer scale objects formed in the early solar system.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/38758
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 伊藤 正一

 

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