Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica
The deformation history of ultrahigh-temperature metamorphic rocks from Tonagh Island, Napier Complex, East Antarctica is divided into nine stages, namely D_1 to D_9. The D_1 structure would have been formed under non- or weakly-deformational condition during thermal peak of prograde metamorphism. T...
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ftnipr:oai:nipr.repo.nii.ac.jp:00003041 2023-05-15T13:49:00+02:00 Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica Tsuyoshi Toyoshima Yasuhito Osanai Masaaki Owada Toshiaki Tsunogae Tomokazu Hokada Warwick A. Crowe 1999-10 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3041 http://id.nii.ac.jp/1291/00003041/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3041&item_no=1&attribute_id=18&file_no=1 en eng Graduate School of Science and Technology, Niigata University/Department of Earth Sciences, Faculty of Education, Okayama University/Department of Earth Aciences, Yamaguchi University/Faculty of Education, Shimane University/Department of Polar Science, School of Mathematical and Physical Sciences, The Graduate University for Advanced Studies/Department of Geology and Geophysics, University of Western Australia National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3041 http://id.nii.ac.jp/1291/00003041/ AA1130866X Polar geoscience, 12, 29-48(1999-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3041&item_no=1&attribute_id=18&file_no=1 Napier Complex ultrahigh-temperature deformation mylonite foliated pseudotachylyte deformation history Departmental Bulletin Paper P(論文) 1999 ftnipr 2022-11-26T19:42:23Z The deformation history of ultrahigh-temperature metamorphic rocks from Tonagh Island, Napier Complex, East Antarctica is divided into nine stages, namely D_1 to D_9. The D_1 structure would have been formed under non- or weakly-deformational condition during thermal peak of prograde metamorphism. The D_2-D_6 structures would have been produced under retrograde granulite facies conditions. Subsequently D_7-D_9 brittle faulting modified the structures in part. The D_1 to D_8 deformation corresponds to first to third tectonometamorphic episodes, previously reported, of the whole Napier Complex before the intrusion of the Amundsen dyke. The structural geology of the Island is mainly characterized by NE-SW trending D_2 foliation (S_2) with WNW plunging mineral lineation, WNW-ESE to E-W trending D_5 folds and NE-SW to E-W trending D_6 mylonite zones. S_2 is the main foliation of this area, but was highly folded and faulted during the D_5-D_6 stages. The S_2 and S_2-parallel D_3 shear zones are the products of layer-parallel shearing due to a top-to-the-SE (dextral-reverse) displacement. The D_3 and D_6 fault rocks show that seismic faulting and plastic deformation alternated both during the D_3 stage and during the D_6 stage under retrograde granulite facies conditions. Multiphase faulting in different shear senses occurred during the D_6 stage. Report Antarc* Antarctica East Antarctica Polar geoscience Tonagh Island National Institute of Polar Research Repository, Japan East Antarctica Napier ENVELOPE(-58.440,-58.440,-62.167,-62.167) Tonagh Island ENVELOPE(50.333,50.333,-67.117,-67.117) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
Napier Complex ultrahigh-temperature deformation mylonite foliated pseudotachylyte deformation history |
spellingShingle |
Napier Complex ultrahigh-temperature deformation mylonite foliated pseudotachylyte deformation history Tsuyoshi Toyoshima Yasuhito Osanai Masaaki Owada Toshiaki Tsunogae Tomokazu Hokada Warwick A. Crowe Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica |
topic_facet |
Napier Complex ultrahigh-temperature deformation mylonite foliated pseudotachylyte deformation history |
description |
The deformation history of ultrahigh-temperature metamorphic rocks from Tonagh Island, Napier Complex, East Antarctica is divided into nine stages, namely D_1 to D_9. The D_1 structure would have been formed under non- or weakly-deformational condition during thermal peak of prograde metamorphism. The D_2-D_6 structures would have been produced under retrograde granulite facies conditions. Subsequently D_7-D_9 brittle faulting modified the structures in part. The D_1 to D_8 deformation corresponds to first to third tectonometamorphic episodes, previously reported, of the whole Napier Complex before the intrusion of the Amundsen dyke. The structural geology of the Island is mainly characterized by NE-SW trending D_2 foliation (S_2) with WNW plunging mineral lineation, WNW-ESE to E-W trending D_5 folds and NE-SW to E-W trending D_6 mylonite zones. S_2 is the main foliation of this area, but was highly folded and faulted during the D_5-D_6 stages. The S_2 and S_2-parallel D_3 shear zones are the products of layer-parallel shearing due to a top-to-the-SE (dextral-reverse) displacement. The D_3 and D_6 fault rocks show that seismic faulting and plastic deformation alternated both during the D_3 stage and during the D_6 stage under retrograde granulite facies conditions. Multiphase faulting in different shear senses occurred during the D_6 stage. |
format |
Report |
author |
Tsuyoshi Toyoshima Yasuhito Osanai Masaaki Owada Toshiaki Tsunogae Tomokazu Hokada Warwick A. Crowe |
author_facet |
Tsuyoshi Toyoshima Yasuhito Osanai Masaaki Owada Toshiaki Tsunogae Tomokazu Hokada Warwick A. Crowe |
author_sort |
Tsuyoshi Toyoshima |
title |
Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica |
title_short |
Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica |
title_full |
Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica |
title_fullStr |
Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica |
title_full_unstemmed |
Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica |
title_sort |
deformation of ultrahigh-temperature metamorphic rocks from tonagh island in the napier complex, east antarctica |
publisher |
Graduate School of Science and Technology, Niigata University/Department of Earth Sciences, Faculty of Education, Okayama University/Department of Earth Aciences, Yamaguchi University/Faculty of Education, Shimane University/Department of Polar Science, School of Mathematical and Physical Sciences, The Graduate University for Advanced Studies/Department of Geology and Geophysics, University of Western Australia |
publishDate |
1999 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3041 http://id.nii.ac.jp/1291/00003041/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3041&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(-58.440,-58.440,-62.167,-62.167) ENVELOPE(50.333,50.333,-67.117,-67.117) |
geographic |
East Antarctica Napier Tonagh Island |
geographic_facet |
East Antarctica Napier Tonagh Island |
genre |
Antarc* Antarctica East Antarctica Polar geoscience Tonagh Island |
genre_facet |
Antarc* Antarctica East Antarctica Polar geoscience Tonagh Island |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3041 http://id.nii.ac.jp/1291/00003041/ AA1130866X Polar geoscience, 12, 29-48(1999-10) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3041&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250338164146176 |