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STRUCTURAL EVOLUTION OF RUNDVAGSHETTA REGION, LUTZOW-HOLM BAY, EAST ANTARCTICA
https://doi.org/10.15094/00002753
https://doi.org/10.15094/0000275302660696-10bb-4391-9fbe-3b7c53ef6071
名前 / ファイル | ライセンス | アクション |
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KJ00002368383 (2.9 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1994-09-01 | |||||
タイトル | ||||||
タイトル | STRUCTURAL EVOLUTION OF RUNDVAGSHETTA REGION, LUTZOW-HOLM BAY, EAST ANTARCTICA | |||||
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 | 10.15094/00002753 | |||||
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) | |||||
論文名よみ | ||||||
その他のタイトル | STRUCTURAL EVOLUTION OF RUNDVAGSHETTA REGION, LUTZOW-HOLM BAY, EAST ANTARCTICA | |||||
著者名よみ |
イシカワ, マサヒロ
× イシカワ, マサヒロ× モトヨシ, ヨウイチ× / カワサキ, トシスケ |
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著者名(英) |
ISHIKAWA, Masahiro
× ISHIKAWA, Masahiro× MOTOYOSHI, Yoichi× FRASER, Geoffrey L.× KAWASAKI, Toshisuke |
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著者所属(英) | ||||||
en | ||||||
Institute of Geology and Paleontology, Faculty of Science, Tohoku University | ||||||
著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research | ||||||
著者所属(英) | ||||||
en | ||||||
Research School of Earth Sciences, Australian National University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Science, Faculty of Science, Ehime University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The highest grade part of the Lutzow-Holm Complex crops out on the southern coastline of Lutzow-Holm Bay in East Antarctica. Orthopyroxene+sillimanite±quartz assemblages reveal high-T, high-P conditions for peak metamorphism of granulites of Rundvagshetta. Moreover, their fabrics imply regional ductile deformation during peak metamorphism, which was characterized by the formation of a WNW-ESE subhorizontal mineral lineation and the development of high-strain structures such as isoclinal buckling folds (F_n) and boudinage (B_n and B_m). The high-strain deformation was followed by the development of symplectic intergrowths of cordierite±sapphirine±spinel around sillimanite and orthopyroxene, and symplectic intergrowths of orthopyroxene+cordierite±sapphirine around garnets in response to decompression. There is little symplectic intergrowth strained intensely, whereas strained cordierite is locally observed. It implies that the regional high-strain deformation had ceased before the time of the reactions orthopyroxene+sillimanite+quartz=cordierite, orthopyroxene+sillimanite=cordierite+sapphirine±spinel, garnet=orthopyroxene+cordierite+sapphirine and garnet+quartz=orthopyroxene+cordierite. In contrast to the peak metamorphic high-strain deformation, the post-peak metamorphic structural evolution was characterized by low-strain and localized deformations such as F_<n+1> gentle folding, emplacement of clinopyroxene pegmatites and basic dykes, and local shearing in the N-S compressional and E-W extensional field. In response to subsequent N-S compression, ductile thrusting had taken place. The last structural event at Rundvagshetta was represented by the emplacement of felsic pegmatites. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 7, p. 69-89, 発行日 1994-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |