Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1992-03-01 |
タイトル |
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タイトル |
Antarctic primitive achondrites Yamato-74025, -75300, and -75305:Their mineralogy, thermal history and the relevance to winonaite |
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 |
ID登録 |
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ID登録 |
10.15094/00004576 |
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ID登録タイプ |
JaLC |
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) |
Kimura, Makoto
Tsuchiyama, Akira
Fukuoka, Takaaki
Iimura, Yasuhiro
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著者所属(英) |
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en |
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Department of Earth Science, Faculty of Science, Ibaraki University |
著者所属(英) |
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en |
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Institute of Earth and Planetary Science, Osaka University |
著者所属(英) |
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en |
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Departmentof Chemistory, Gakushuin University |
著者所属(英) |
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en |
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The Institute of Physical andChemical Research |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
Three Antarctic primitive achondrites, Yamato (Y)-74025,-75300,and -75305 were mineralogically and chemically studied. They consist of anhedral to subhedral silicate and opaque minerals. The major constituent minerals are typical of equilibrated ordinary chondrites. However, they do not have any relic of chondrule, and the presence of various accessory minerals, such as K-feldspar, schreibersite, daubreelite, phosphate, Nb-bearing rutile, and magnesiochromite, characterizes these meteorites. Y-75305 has a composite grain containing Cu, Mn, and S, probably consisting of alabandite, an unknown Mn-bearing Cu-sulfide, and digenite. Y-74025 has a REE pattern typical of chondrite. Siderophile elements in Y-74025 are depleted relative to Cl chondrites, which is consistent with poor abundance of Fe-Ni metal in Y-74025. Holocrystalline texture, homogeneous mineral compositions, and high equilibration temperatures for pyroxenes, suggest that these primitive achondrites experienced high-temperature metamorphism. Mineralogical and chemical characteristics suggest that they resemble Winona-like meteorites (winonaites). The compositions of pyroxene and olivine, and accessory minerals suggest that winonaites formed under an intermediate redox condition between E-chondrites and Acapulco-like primitive achondrites. The abundance of troilite and Fe-Ni metal varies widely. The metal-sulfide fractions of winonaites probably melted and fractionated, although silicate fractions of winonaites do not have any evidence for melting. |
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 |
AA10784627 |
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites
巻 5,
p. 165-190,
発行日 1992-03
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出版者 |
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出版者 |
National Institute of Polar Research |