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Yamato-74640 (H5-6) shows a plateau age of 4407±71 m.y. (1σ) at higher temperatures. This age probably corresponds to the time of formation or a very intense metamorphism for this meteorite. Yamato-74190 (L6) indicates a ^\u003c40\u003e(Ar)-^\u003c89\u003e(Ar) age spectrum with a low temperature plateau-like age of 357±32 m.y. The apparent ^\u003c40\u003e(Ar)-^\u003c39\u003e(Ar) age increases up to about 1300 m.y., but does not reach a high temperature plateau. The apparent young age would reflect the time of degassing due to the collisional process of the parent body, which has been observed in many L-chondrites. Yamato-74159,which is a eucritic polymict breccia, has a similar age spectrum to that of Pasamonte obtained by PODOSEK and HUNEKE (Geochim. Cosmochim. Acta, 37,667,1973), indicating a plateau age of 4075±49 m.y. at intermediate temperatures (850-1250℃). 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40Ar-39Ar Age Studies of Four Yamato-74 Meteorites
https://nipr.repo.nii.ac.jp/records/968
https://nipr.repo.nii.ac.jp/records/968fc4c52a4-c645-40cb-af9d-90d72a3ac97d
名前 / ファイル | ライセンス | アクション |
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KJ00000011514 (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 | 1979-03-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | 40Ar-39Ar Age Studies of Four Yamato-74 Meteorites | |||||
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× Ozima, Minoru× Yanagisawa, Masahisa |
|||||
著者所属(英) | ||||||
en | ||||||
Geophysical Institute, Faculty of Science, University of Tokyo | ||||||
著者所属(英) | ||||||
en | ||||||
Geophysical Institute, Faculty of Science, University of Tokyo | ||||||
著者所属(英) | ||||||
en | ||||||
Geophysical Institute, Faculty of Science, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | ^<40>(Ar)-^<39>(Ar) ages have been obtained for four Yamato-74 meteorites (Yamato-74640,-74190,-74159 and -74097) from Antarctica. Yamato-74640 (H5-6) shows a plateau age of 4407±71 m.y. (1σ) at higher temperatures. This age probably corresponds to the time of formation or a very intense metamorphism for this meteorite. Yamato-74190 (L6) indicates a ^<40>(Ar)-^<89>(Ar) age spectrum with a low temperature plateau-like age of 357±32 m.y. The apparent ^<40>(Ar)-^<39>(Ar) age increases up to about 1300 m.y., but does not reach a high temperature plateau. The apparent young age would reflect the time of degassing due to the collisional process of the parent body, which has been observed in many L-chondrites. Yamato-74159,which is a eucritic polymict breccia, has a similar age spectrum to that of Pasamonte obtained by PODOSEK and HUNEKE (Geochim. Cosmochim. Acta, 37,667,1973), indicating a plateau age of 4075±49 m.y. at intermediate temperatures (850-1250℃). This age may reflect the time of the later degassing event such as the impact of meteoroids on the parent body of the eucrite. Yamato-74097 (Diogenite) seems to show a relatively young ^<40>(Ar)-^<39>(Ar) age of about 1100 m.y., though the uncertainty in the obtained age is larger for this diogenite than those for the other samples due to its low K-content. From both the value of the age and the age spectrum, this diogenite seems to have a different history from those of ordinary chondrites and achondrites known to date. | |||||
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 12, p. 186-206, 発行日 1979-03 |