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40Ar-39Ar ages of Antarctic meteorites: Y-74191, Y-75258, Y-7308, Y-74450 and ALH-765
https://nipr.repo.nii.ac.jp/records/1219
https://nipr.repo.nii.ac.jp/records/12196389a066-1570-4792-9bfe-7dc79b95b0c5
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
KJ00000011745 (2.8 MB)
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| Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 1981-12-01 | |||||||
| タイトル | ||||||||
| タイトル | 40Ar-39Ar ages of Antarctic meteorites: Y-74191, Y-75258, Y-7308, Y-74450 and ALH-765 | |||||||
| 言語 | en | |||||||
| 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 | |||||||
| ページ属性 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | P(論文) | |||||||
| 著者名(英) |
Kaneoka, Ichiro
× Kaneoka, Ichiro
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| 著者所属(英) | ||||||||
| en | ||||||||
| Geological Institute, Faculty of Science, University of Tokyo | ||||||||
| 抄録(英) | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | The ^<40>(Ar)-^<39>(Ar) ages have been determined for two chondrites (Y-74191,Y-75258), one howardite (Y-7308) and two eucrites (Y-74450,ALH-765) from Antarctica. Y-74191 (L3) shows a disturbed age spectrum with a maximum apparent age of 4506±31 Ma in the intermediate temperature fraction. Y-75258 (LL6) shows a plateau age of 4377±14 Ma at higher temperatures except for the highest temperature fraction. A howardite Y-7308 has an inversed age spectrum, but the intermediate temperature fractions indicate a plateau-like age of 4480±30 Ma. The apparent very old age at the lowest temperature might have been caused either by the effect of atmospheric contamination to the sample or by the redistribution of radiogenic ^<40>(Ar) in the sample. One eucrite Y-74450 shows a plateau age of 4012±22 Ma, indicating a later thermal event on the parent body of the meteorite. The other eucrite ALH-765 indicates a gradual increase in the apparent ^<40>(Ar)-^<39>(Ar) ages with increasing degassing temperature, but even the highest temperature fraction shows an age of about 3700 Ma. The present results together with those of reported ^<40>(Ar)-^<39>(Ar) and K-Ar ages suggest that meteorites found in Antarctica represent thermal histories very different from one another. | |||||||
| 雑誌書誌ID | ||||||||
| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AA00733561 | |||||||
| 書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 20, p. 250-263, 発行日 1981-12 |
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