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Yamato-74063: Chondritic meteorite classified between E and H chondrite groups
https://doi.org/10.15094/00004540
https://doi.org/10.15094/0000454090935a45-420e-4565-ada8-18f61c48d53e
名前 / ファイル | ライセンス | アクション |
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KJ00000036346 (2.1 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||||
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公開日 | 1991-03-01 | |||||||||
タイトル | ||||||||||
タイトル | Yamato-74063: Chondritic meteorite classified between E and H chondrite groups | |||||||||
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 | 10.15094/00004540 | |||||||||
ID登録タイプ | JaLC | |||||||||
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内容記述タイプ | Other | |||||||||
内容記述 | P(論文) | |||||||||
著者名(英) |
Yanai, Keizo
× Yanai, Keizo
× Kojima, Hideyasu
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著者所属(英) | ||||||||||
en | ||||||||||
National Institute of Polar Research | ||||||||||
著者所属(英) | ||||||||||
en | ||||||||||
National Institute of Polar Research | ||||||||||
抄録(英) | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | Yamato-74063 (Y-74063) was found in Antarctica by the Japanese Antarctic Research Expedition in November 1974. Y-74063 is an almost complete, smoothly rounded stone weighing 35.4g covered with brownish-black fusion crust. The thin section shows that this meteorite has generally poorly traced chondritic texture and "chondrules" merge into the recrystallized matrix. Compositions of olivine and low-Ca pyroxene are homogeneous and average Fa_<10.9> and Fs_<10.7> respectively. These compositions strongly suggest that Y-74063 is not similar to all the previously known chondrites. Bulk analysis shows that the total iron content of Y-74063 is the lowest of the ordinary chondrite groups, and the abundance of troilite is much higher than those of all ordinary chondrites. Texture, bulk and mineral compositions of Y-74063 indicate that this meteorite is identified as chondrite and classified into a new type of chondrite group which is between E and H chondrite groups. Y-74063 is similar to Acapulco, ALH-77081 and ALH-78230 in mineral composition which occupies the intermediate site between the E and H chondrites. But the latter 3 chondrites have no evidence of chondrules in spite of "chondritic" texture, mineral assemblage and compositions. Bulk composition indicates that Y-74063 differs from Acapulco-type meteorites and all previously known chondrite groups. The presence of Y-74063 suggests that there is a great possibility of the existence of more unknown meteorite types in Antarctica, and non-Antarctic regions. | |||||||||
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 4, p. 118-130, 発行日 1991-03 |
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出版者 | ||||||||||
出版者 | National Institute of Polar Research |