Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
2006-10-01 |
タイトル |
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タイトル |
Pan-African adakitic rocks from the Sør Rondane Mountains, East Antarctica |
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 |
Dronning Maud Land |
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 |
the Sør Rondane Mountains |
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 |
Pan-African |
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 |
collision zone |
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 |
adakitic rock |
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 |
10.15094/00003169 |
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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) |
Owada, Masaaki
Toyoshima, Tsuyoshi
Shiraishi, Kazuyuki
Kagami, Hiroo
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著者所属(英) |
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en |
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Department of Earth Sciences, Yamaguchi University/Graduate School of Science and Technology, Niigata University/National Institute of Polar Research/Graduate School of Science and Technology, Niigata University |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
The Sør Rondane Mountains (22°E -28°E ) are located in eastern Dronning Maud Land, East Antarctica, and consist of amphibolite to granulite facies metamorphic rocks and various intrusive rocks. Peak metamorphism took place during the Pan-African event. Considering the mode of occurrence and previously reported age data, felsic magma activity started at the waning stage of the metamorphism. In this study, we report on the petrogenesis of discordantly intruding post-tectonic pyroxene tonalite (Px tonalite) with adakitic composition. In addition, the petrogenesis of posttectonic biotite granite (Bt granite), of which the geochemical features are similar to high-K adakite in the collision zone, are reevaluated with reference to the Px granite. The initial Sr isotopic ratios (SrI) corrected to 525Ma of Px tonalite and Bt granite represent limited values (0.7037-0.7052) that are included within the SrI of the Proterozoic metatonalite corrected to the same age (525Ma). These Sr isotopic signatures combined with geochemical modeling suggest that chemical variation of Px tonalite and Bt granite can be explained by partial melting of the Proterozoic metatonalite with various degrees of melting, leaving garnet as a residual phase, subsequent to fractional crystallization and/or accumulation of specific phases. Taking the tectonic situation and geochemical signature into account, Px tonalite and Bt granite from the Sør Rondane Mountains are correlated to the collision zone adakite and represent the post-collision magmatism in the suture zone during the Gondwana formation of the Pan-African event. |
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 19,
p. 173-188,
発行日 2006-10
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出版者 |
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出版者 |
National Institute of Polar Research |