Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
2002-10-01 |
タイトル |
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タイトル |
Peak temperatures of ultra-high temperature metamorphism of the Napier Complex, Enderby Land, East Antarctica, as deduced from porphyroclastic pyroxenes of meta-ultramafic rocks |
言語 |
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言語 |
eng |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
meta-ultramafic rocks |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Mt. Riiser-Larsen |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Napier Complex |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
peak temperatures |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
porphyroclastic pyroxenes |
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 |
10.15094/00003105 |
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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) |
Ishizuka, Hideo
Suzuki, Satoko
Nakamura, Aki
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著者所属(英) |
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en |
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Department of Geology, Kochi University |
著者所属(英) |
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en |
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Graduate School of Science and Technology, Niigata University |
著者所属(英) |
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en |
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Department of Geology, Kochi University |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
In the Mt. Riiser-Larsen area of the Archaean Napier Complex, an ultra-high temperature (UHT) metamorphic complex, Enderby Land, East Antarctica, meta-ultramafic rocks occur as blocks and pods embedded in orthopyroxene felsic gneiss or garnet felsic gneiss and as thin layers intercalated with orthopyroxene felsic gneiss. They consist mainly of olivine, orthopyroxene, clmopyroxene and spinel with or without phlogopite. On the basis of the modal proportion of olivine and pyroxene, they are classified into peridotite and minor pyroxenite. These constituent minerals are generally medium- to coarse-grained with granular texture. Furthermore, some samples also contain coarse-grained but porphyroclastic chno- and orthopyroxenes that are sometimes armored locally by neoblastic pyroxenes. Chemical compositions of granular pyroxenes are similar to those of neoblastic varieties, which are, however, different from those of porphyroclastic pyroxenes; porphyroclastic clinopyroxenes are rich in Al_2O_3 but poor in CaO as compared with granular and neoblastic clinopyroxenes. The pyroxene thermometer yields 600-650℃ for granular and neoblastic pyroxenes, while porphyroclastic pyroxenes indicate about 1130℃. The former lower temperatures are interpreted as representing a closure temperature of the thermometer, while the latter higher temperatures indicate a peak metamorphic temperature of the Napier UHT metamorphism. |
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 |
AA1130866X |
書誌情報 |
Polar geoscience
巻 15,
p. 1-16,
発行日 2002-10
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出版者 |
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出版者 |
National Institute of Polar Research |