Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1978-02-01 |
タイトル |
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言語 |
en |
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タイトル |
A Preliminary Mineralogical Examination of the Yamato-74 Achondrites |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
著者名(英) |
Takeda, Hiroshi
Miyamoto, Masamichi
Yanai, Keizo
Haramura, Hiroshi
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著者所属(英) |
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en |
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Mineralogical Institute, Faculty of Science, University of Tokyo |
著者所属(英) |
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en |
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Department of Earth Sciences, Kobe University |
著者所属(英) |
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en |
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National Institute of Polar Research |
著者所属(英) |
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en |
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Geological Institute, Faculty of Science, University of Tokyo |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
Seven diogenites, two eucritic polymict breccias and one pallasite have been identified in the Yamato-74 meteorites by the electron microprobe and single crystal X-ray diffraction techniques. The texture of Yamato-74010,-74011,-74013,-74037,-74097,-74136 and -74648 is unlike those of the other diogenites. It is not brecciated and texturally the pyroxene seems to have recrystallized to a granoblastic texture with small change in mineral composition. The chemical composition of the orthopyroxenes in these diogenites falls in the range (Ca)_<1.9> (Mg)_<75.1> (Fe)_<23.0> to (Ca)_<3.0> (Mg)_<71.0> (Fe)_<26.0>. The chemistry and textures of these diogenites are the same as those of the Yamato-6902 (b) diogenite previously reported. These Yamato diogenites may represent fragments of the same fall. Yamato-74159 is a polymict breccia which contains mineral and lithic clasts common to eucrites. The Yamato-74450 eucrite shows a variolitic texture, indicating a rapid solidification near the surface of its parent body. A brecciated part containing a pigeonite crystal with augite lamellae is also found in small amounts. The pyroxene trends of Yamato-74450 resemble those of the Pasamonte eucrite. The Yamato-74044 pallasite is the only stony-iron meteorite among the Yamato collection. A preliminary examination of the Yamato-75 meteorites identified one iron-rich diogenite and two eucritic polymict breccias. Yamato-75032 is the most Fe-rich of any known diogenite. |
雑誌書誌ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00733561 |
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue
巻 8,
p. 170-184,
発行日 1978-02
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