STRUCTURAL EVOLUTION OF RUNDVAGSHETTA REGION, LUTZOW-HOLM BAY, EAST ANTARCTICA
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概要
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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.
- 国立極地研究所の論文
著者
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Fraser G
Research School Of Earth Sciences Australian National University
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Motoyoshi Yoichi
National Institute of Polar Research
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Ishikawa Masahiro
Geological Institute, Yokohama National University
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KAWASAKI Toshisuke
Department of Biological Chemistry and CREST (Core Research for Educational Science and Technology)
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Ishikawa Masahiro
Institute Of Geology And Paleontology Faculty Of Science Tohoku University:(present Address)geologic
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Ishikawa M
Yokohama National Univ. Yokohama Jpn
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FRASER Geoffrey
Research School of Earth Sciences, Australian National University
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Motoyoshi Y
National Inst. Polar Res. Tokyo Jpn
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Fraser Geoffrey
Research School Of Earth Sciences Australian National University
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Kawasaki T
Division Of Earth Sciences Department Of Biosphere-geosphere Sciences Faculty Of Science Ehime Unive
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Ishikawa Masahiro
Institute Of Geology And Paleontology Faculty Of Science Tohoku University
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Kawasaki Toshisuke
Department Of Biochemistry Kyoto University
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