Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica
The geological structures of Skallevikshalsen, Lutzow-Holm Complex, East Antarctica are mainly controlled by two stages of ductile deformation, D_(m-1) and D_m. The D_(m-1) stage is characterized by the development of isoclinal F_(m-1) folds with fold axes gently plunging ENE or SWS, and axial plane...
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Department of Earth Sciences, Faculty of Education, Okayama University/Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University
2004
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ftnipr:oai:nipr.repo.nii.ac.jp:00003132 2023-05-15T13:49:00+02:00 Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica Kawakami,Tetsuo Ikeda,Takeshi 2004-10 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3132 http://id.nii.ac.jp/1291/00003132/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3132&item_no=1&attribute_id=18&file_no=1 en eng Department of Earth Sciences, Faculty of Education, Okayama University/Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3132 http://id.nii.ac.jp/1291/00003132/ AA1130866X Polar geoscience, 17, 1-11(2004-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3132&item_no=1&attribute_id=18&file_no=1 deformation fold interference pattern Lutzow-Holm Complex Skallevikshalsen Departmental Bulletin Paper P(論文) 2004 ftnipr 2022-12-03T19:43:04Z The geological structures of Skallevikshalsen, Lutzow-Holm Complex, East Antarctica are mainly controlled by two stages of ductile deformation, D_(m-1) and D_m. The D_(m-1) stage is characterized by the development of isoclinal F_(m-1) folds with fold axes gently plunging ENE or SWS, and axial planes parallel to the compositional layering (S_(m-1)) of the metamorphic rocks. The D_m stage is characterized by the development of tight folds with axes parallel to F_(m-1) and almost vertical axial planes. An axial planar foliation, S_m, defined by the alignment of biotite and hornblende, is formed in the hinges of F_m folds. No change in direction of elongation took place between D_(m-1) and D_m. Microstructural study and field observations show that a stretching lineation on S_(m-1) defined by the alignment of sillimanite was formed during D_(m-1). The alignment of sillimanite inclusions in garnet rims probably corresponds to an older schistosity formed during D_(m-2), which had a different orientation of principal strain axes than those of D_(m-1) and D_m. Peak metamorphic mineral assemblages are preserved in garnet cores, and their formation is considered to predate D_(m-2). Absence of the alignment of inclusions in garnet cores suggests that peak metamorphism was attained under conditions without strong deformation. Report Antarc* Antarctica East Antarctica Polar geoscience National Institute of Polar Research Repository, Japan East Antarctica Skallevikshalsen ENVELOPE(39.333,39.333,-69.692,-69.692) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
deformation fold interference pattern Lutzow-Holm Complex Skallevikshalsen |
spellingShingle |
deformation fold interference pattern Lutzow-Holm Complex Skallevikshalsen Kawakami,Tetsuo Ikeda,Takeshi Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica |
topic_facet |
deformation fold interference pattern Lutzow-Holm Complex Skallevikshalsen |
description |
The geological structures of Skallevikshalsen, Lutzow-Holm Complex, East Antarctica are mainly controlled by two stages of ductile deformation, D_(m-1) and D_m. The D_(m-1) stage is characterized by the development of isoclinal F_(m-1) folds with fold axes gently plunging ENE or SWS, and axial planes parallel to the compositional layering (S_(m-1)) of the metamorphic rocks. The D_m stage is characterized by the development of tight folds with axes parallel to F_(m-1) and almost vertical axial planes. An axial planar foliation, S_m, defined by the alignment of biotite and hornblende, is formed in the hinges of F_m folds. No change in direction of elongation took place between D_(m-1) and D_m. Microstructural study and field observations show that a stretching lineation on S_(m-1) defined by the alignment of sillimanite was formed during D_(m-1). The alignment of sillimanite inclusions in garnet rims probably corresponds to an older schistosity formed during D_(m-2), which had a different orientation of principal strain axes than those of D_(m-1) and D_m. Peak metamorphic mineral assemblages are preserved in garnet cores, and their formation is considered to predate D_(m-2). Absence of the alignment of inclusions in garnet cores suggests that peak metamorphism was attained under conditions without strong deformation. |
format |
Report |
author |
Kawakami,Tetsuo Ikeda,Takeshi |
author_facet |
Kawakami,Tetsuo Ikeda,Takeshi |
author_sort |
Kawakami,Tetsuo |
title |
Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica |
title_short |
Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica |
title_full |
Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica |
title_fullStr |
Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica |
title_full_unstemmed |
Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica |
title_sort |
timing of ductile deformation and peak metamorphism in skallevikshalsen, lutzow-holm complex, east antarctica |
publisher |
Department of Earth Sciences, Faculty of Education, Okayama University/Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University |
publishDate |
2004 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3132 http://id.nii.ac.jp/1291/00003132/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3132&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(39.333,39.333,-69.692,-69.692) |
geographic |
East Antarctica Skallevikshalsen |
geographic_facet |
East Antarctica Skallevikshalsen |
genre |
Antarc* Antarctica East Antarctica Polar geoscience |
genre_facet |
Antarc* Antarctica East Antarctica Polar geoscience |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3132 http://id.nii.ac.jp/1291/00003132/ AA1130866X Polar geoscience, 17, 1-11(2004-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3132&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250364745547776 |