PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA
Granulite-facies metamorphic rocks of Forefinger Point, which lie on the Casey Bay coastline in Enderby Land, have been affected by three stages of folding, shear zone formation, and intrusion of pegmatite. The peak metamorphic structural evolution was characterized by the development of F_n isoclin...
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Institute of Geology and Paleontology, Faculty of Science, Tohoku University
1994
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ftnipr:oai:nipr.repo.nii.ac.jp:00002754 2023-05-15T13:49:00+02:00 PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA イシカワ マサヒロ モトヨシ ヨウイチ / Masahiro ISHIKAWA Yoichi MOTOYOSHI Geoffrey L. FRASER 1994-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2754 http://id.nii.ac.jp/1291/00002754/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2754&item_no=1&attribute_id=18&file_no=1 en eng Institute of Geology and Paleontology, Faculty of Science, Tohoku University National Institute of Polar Research Research School of Earth Sciences, Australian National University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2754 http://id.nii.ac.jp/1291/00002754/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 7, 90-100(1994-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2754&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1994 ftnipr 2022-11-26T19:42:11Z Granulite-facies metamorphic rocks of Forefinger Point, which lie on the Casey Bay coastline in Enderby Land, have been affected by three stages of folding, shear zone formation, and intrusion of pegmatite. The peak metamorphic structural evolution was characterized by the development of F_n isoclinal to close buckling folds. This deformation was associated with the coexistence of orthopyroxene+sillimanite±quartz, and was followed by the formation of cordierite and symplectites of cordierite+sapphirine, orthopyroxene+cordierite+sapphirine in response to subsequent isothermal decompression. These symplectic intergrowths are generally unstrained except in some cordierite domains where cordierite exhibits a weak mineral lineation, implying that intense ductile deformation had ceased before the decompressional reactions : orthopyroxene+sillimanite+quartz=cordierite, orthopyroxene+sillimanite=cordierite+sapphirine, garnet+quartz=orthopyroxene+cordierite. Although the Forefinger Point granulites have undergone high strain deformation under peak metamorphic conditions, they experienced only low and local strain deformation after peak metamorphism. The post-peak-metamorphic structural evolution was characterized by the development of F_<n+1> open to gentle buckling folds, narrow shear zones and emplacement of pegmatite. Report Antarc* Antarctica Casey Bay East Antarctica Enderby Land National Institute of Polar Research Repository, Japan East Antarctica Casey Bay ENVELOPE(48.000,48.000,-67.500,-67.500) Forefinger Point ENVELOPE(48.067,48.067,-67.617,-67.617) |
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Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Granulite-facies metamorphic rocks of Forefinger Point, which lie on the Casey Bay coastline in Enderby Land, have been affected by three stages of folding, shear zone formation, and intrusion of pegmatite. The peak metamorphic structural evolution was characterized by the development of F_n isoclinal to close buckling folds. This deformation was associated with the coexistence of orthopyroxene+sillimanite±quartz, and was followed by the formation of cordierite and symplectites of cordierite+sapphirine, orthopyroxene+cordierite+sapphirine in response to subsequent isothermal decompression. These symplectic intergrowths are generally unstrained except in some cordierite domains where cordierite exhibits a weak mineral lineation, implying that intense ductile deformation had ceased before the decompressional reactions : orthopyroxene+sillimanite+quartz=cordierite, orthopyroxene+sillimanite=cordierite+sapphirine, garnet+quartz=orthopyroxene+cordierite. Although the Forefinger Point granulites have undergone high strain deformation under peak metamorphic conditions, they experienced only low and local strain deformation after peak metamorphism. The post-peak-metamorphic structural evolution was characterized by the development of F_<n+1> open to gentle buckling folds, narrow shear zones and emplacement of pegmatite. |
format |
Report |
author |
イシカワ マサヒロ モトヨシ ヨウイチ / Masahiro ISHIKAWA Yoichi MOTOYOSHI Geoffrey L. FRASER |
spellingShingle |
イシカワ マサヒロ モトヨシ ヨウイチ / Masahiro ISHIKAWA Yoichi MOTOYOSHI Geoffrey L. FRASER PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA |
author_facet |
イシカワ マサヒロ モトヨシ ヨウイチ / Masahiro ISHIKAWA Yoichi MOTOYOSHI Geoffrey L. FRASER |
author_sort |
イシカワ マサヒロ |
title |
PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA |
title_short |
PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA |
title_full |
PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA |
title_fullStr |
PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA |
title_full_unstemmed |
PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA |
title_sort |
preliminary report on structures of forefinger point, enderby land, east antarctica |
publisher |
Institute of Geology and Paleontology, Faculty of Science, Tohoku University |
publishDate |
1994 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2754 http://id.nii.ac.jp/1291/00002754/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2754&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(48.000,48.000,-67.500,-67.500) ENVELOPE(48.067,48.067,-67.617,-67.617) |
geographic |
East Antarctica Casey Bay Forefinger Point |
geographic_facet |
East Antarctica Casey Bay Forefinger Point |
genre |
Antarc* Antarctica Casey Bay East Antarctica Enderby Land |
genre_facet |
Antarc* Antarctica Casey Bay East Antarctica Enderby Land |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2754 http://id.nii.ac.jp/1291/00002754/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 7, 90-100(1994-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2754&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250307441917952 |