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Petrological and geochemical study of the Yamato-74359 and Yamato-74360 achondrites
https://doi.org/10.15094/00004541
https://doi.org/10.15094/00004541662f1f2d-3b0b-4252-9650-807ae484905e
名前 / ファイル | ライセンス | アクション |
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KJ00000036347 (1.3 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 | Petrological and geochemical study of the Yamato-74359 and Yamato-74360 achondrites | |||||
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 | 10.15094/00004541 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Ikeda, Yukio
× Ikeda, Yukio× Tsuchiyama, Akira× Ebihara, Mitsuru |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Faculty of Science, Ibaraki University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Culture, Osaka University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Chemistry, Tokyo Metropolitan University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Two Antarctic achondrites, Yamato (Y)-74359 and Y-74360,are very similar in bulk chemical compositions to the silicate portions of H chondrites, but the siderophile elements are extremely depleted in comparison to those of H chondrites. They consist of olivine, pyroxene and cryptocrystalline feldspar with minor amounts of chromite, kamacite, and troilite, and the chemical compositions of the constituent minerals are similar to those in H chondrites. Taking into consideration that the two achondrites have oxygen isotopic compositions typical of H chondrites, they were produced from H chondrites or the precursors of H chondrites. Chondrules are not observed, and the texture of the two achondrites is similar to one another, although Y-74360 is coarser-grained than Y-74359. Olivine occurs as euhedral or subhedral grains, mostly smaller than 100 microns in diameter, and they show slight chemical zoning, from magnesian cores (Fo_<82-83>) to ferroan rims (Fo_<80-78>). Orthopyroxene occurs as euhedral grains, larger than olivine grains, and also shows slight chemical zoning, from Ca-poorer magnesian cores to Ca-richer ferroan rims. Clinopyroxene occurs as rims of orthopyroxenes and shows remarkable chemical zoning continuously from pigeonitic interiors to augitic rims. Cryptocrystalline feldspar occurs in interstitial spaces between olivine and/or pyroxene, and seems to have crystallized in interstitial liquids in a rapid cooling condition. The cryptocrystalline feldspars in Y-74359 are chemically heterogeneous, classified into three groups, albite (An_<1-4>Ab_<94-96>Or_<2-4>), anorthoclase (An_<6-10>Ab_<79-86>Or_<4-15>), and intermediate alkali feldspar (An_<1-2>Ab_<51-56>Or_<42-47>), and occur in different portions of the thin section. The two achondrites seem to have formed by partial melting from heterogeneous silicate precursors of unequilibrated H chondrites. | |||||
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. 131-143, 発行日 1991-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |