DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA
Granulite- to amphibolite-facies metamorphic terrain lies on the coastline of Luzow-Holm Bay (LHB) and Prince Olav Coast (POC). To examine as to whether there are distinct difference in the mode of deformation from place to place, we studied fold structures of the LHB and POC regions during JARE-33...
Main Authors: | , , , |
---|---|
Format: | Report |
Language: | English |
Published: |
ABSTRACT
1994
|
Subjects: | |
Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2768 http://id.nii.ac.jp/1291/00002768/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2768&item_no=1&attribute_id=18&file_no=1 |
id |
ftnipr:oai:nipr.repo.nii.ac.jp:00002768 |
---|---|
record_format |
openpolar |
spelling |
ftnipr:oai:nipr.repo.nii.ac.jp:00002768 2023-05-15T13:49:00+02:00 DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA イシカワ マサヒロ モトヨシ ヨウイチ Masahiro ISHIKAWA Yoichi MOTOYOSHI 1994-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2768 http://id.nii.ac.jp/1291/00002768/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2768&item_no=1&attribute_id=18&file_no=1 en eng ABSTRACT Institute of Geology and Paleontology, Faculty of Science, Tohoku University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2768 http://id.nii.ac.jp/1291/00002768/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 7, 184-185(1994-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2768&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1994 ftnipr 2022-11-26T19:42:11Z Granulite- to amphibolite-facies metamorphic terrain lies on the coastline of Luzow-Holm Bay (LHB) and Prince Olav Coast (POC). To examine as to whether there are distinct difference in the mode of deformation from place to place, we studied fold structures of the LHB and POC regions during JARE-33 and -34. Here we define five fold elements, F_<n-2>, F_<n-1>, F_n, F_<n+1> and F_<n+2>, in developing order. F_n folding : F_n folds are isoclinal and generally overturned (recumbent) folds with subhorizontal fold axes, and were dominantly developed in such area as Botnnuten, Rundvagshetta, Berrodden, Skallen, Austhovde, Padda, Skarvsnes, Breidvagnipa, the Ongul Islands, Akarui Point, Kasumi Rock and Cape Hinode. The plunge of F_n folds is generally parallel to those of the dominant mineral lineation (L_n) defined by sillimanite, orthopyroxene, hornblende, feldspar and quartz. Aligned biotite grains in garnet-biotite gneiss show axial plane foliation of the F_n fold except at the Rundvagshetta region where they crosscut the axial surfaces of F_n folds. The wavelength (up to hundreds of meters) depends on the layer thickness, implying that F_n folds were buckled folds. Thus asymmetry of smaller-scale folds indicates the larger regional enveloping surfaces. In Skarvsnes, the F_n folds partially exhibit sheath shapes. The F_n folds were clearly refolded by gentle folds. Post-F_n folding : Gentle folds commonly developed in the same areas where F_n folding are observed. These gentle folds have subvertical axial planes and subhorizontal fold axes and are characterized by buckling (up to 5km in wavelength). Two stages of gentle-folds are recognized in Botnnuten, East Ongul Island, Akarui Point and Kasumi Rock as well as Skarvsnes and Skallen (T. ISHIKAWA : Mem. Natl Inst. Polar Res., Ser. C, 9,1,1976; M. YOSHIDA : J. Geosci., Osaka City Univ., 21,65,1978). This suggests that development of gentle folds of two deformational stages (F_<n+1> and F_<n+2>) succeeded to the intense F_n folding ... Report Antarc* Antarctica East Antarctica East Ongul Island Ongul Island Prince Olav Coast National Institute of Polar Research Repository, Japan East Antarctica Ongul ENVELOPE(39.533,39.533,-69.017,-69.017) Ongul Island ENVELOPE(39.533,39.533,-69.017,-69.017) Prince Olav Coast ENVELOPE(41.000,41.000,-69.000,-69.000) East Ongul Island ENVELOPE(39.583,39.583,-69.017,-69.017) Skarvsnes ENVELOPE(39.667,39.667,-69.467,-69.467) Cape Hinode ENVELOPE(42.633,42.633,-68.117,-68.117) Rundvagshetta ENVELOPE(39.000,39.000,-69.883,-69.883) Kasumi Rock ENVELOPE(42.250,42.250,-68.383,-68.383) Austhovde ENVELOPE(37.800,37.800,-69.708,-69.708) Botnnuten ENVELOPE(38.017,38.017,-70.400,-70.400) Berrodden ENVELOPE(39.083,39.083,-69.767,-69.767) Skallen ENVELOPE(39.467,39.467,-69.650,-69.650) Padda ENVELOPE(38.300,38.300,-69.650,-69.650) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Granulite- to amphibolite-facies metamorphic terrain lies on the coastline of Luzow-Holm Bay (LHB) and Prince Olav Coast (POC). To examine as to whether there are distinct difference in the mode of deformation from place to place, we studied fold structures of the LHB and POC regions during JARE-33 and -34. Here we define five fold elements, F_<n-2>, F_<n-1>, F_n, F_<n+1> and F_<n+2>, in developing order. F_n folding : F_n folds are isoclinal and generally overturned (recumbent) folds with subhorizontal fold axes, and were dominantly developed in such area as Botnnuten, Rundvagshetta, Berrodden, Skallen, Austhovde, Padda, Skarvsnes, Breidvagnipa, the Ongul Islands, Akarui Point, Kasumi Rock and Cape Hinode. The plunge of F_n folds is generally parallel to those of the dominant mineral lineation (L_n) defined by sillimanite, orthopyroxene, hornblende, feldspar and quartz. Aligned biotite grains in garnet-biotite gneiss show axial plane foliation of the F_n fold except at the Rundvagshetta region where they crosscut the axial surfaces of F_n folds. The wavelength (up to hundreds of meters) depends on the layer thickness, implying that F_n folds were buckled folds. Thus asymmetry of smaller-scale folds indicates the larger regional enveloping surfaces. In Skarvsnes, the F_n folds partially exhibit sheath shapes. The F_n folds were clearly refolded by gentle folds. Post-F_n folding : Gentle folds commonly developed in the same areas where F_n folding are observed. These gentle folds have subvertical axial planes and subhorizontal fold axes and are characterized by buckling (up to 5km in wavelength). Two stages of gentle-folds are recognized in Botnnuten, East Ongul Island, Akarui Point and Kasumi Rock as well as Skarvsnes and Skallen (T. ISHIKAWA : Mem. Natl Inst. Polar Res., Ser. C, 9,1,1976; M. YOSHIDA : J. Geosci., Osaka City Univ., 21,65,1978). This suggests that development of gentle folds of two deformational stages (F_<n+1> and F_<n+2>) succeeded to the intense F_n folding ... |
format |
Report |
author |
イシカワ マサヒロ モトヨシ ヨウイチ Masahiro ISHIKAWA Yoichi MOTOYOSHI |
spellingShingle |
イシカワ マサヒロ モトヨシ ヨウイチ Masahiro ISHIKAWA Yoichi MOTOYOSHI DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA |
author_facet |
イシカワ マサヒロ モトヨシ ヨウイチ Masahiro ISHIKAWA Yoichi MOTOYOSHI |
author_sort |
イシカワ マサヒロ |
title |
DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA |
title_short |
DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA |
title_full |
DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA |
title_fullStr |
DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA |
title_full_unstemmed |
DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA |
title_sort |
definition of fold elements in the vicinity of lutzow-holm bay and prince olav coast, east antarctica |
publisher |
ABSTRACT |
publishDate |
1994 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2768 http://id.nii.ac.jp/1291/00002768/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2768&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(39.533,39.533,-69.017,-69.017) ENVELOPE(39.533,39.533,-69.017,-69.017) ENVELOPE(41.000,41.000,-69.000,-69.000) ENVELOPE(39.583,39.583,-69.017,-69.017) ENVELOPE(39.667,39.667,-69.467,-69.467) ENVELOPE(42.633,42.633,-68.117,-68.117) ENVELOPE(39.000,39.000,-69.883,-69.883) ENVELOPE(42.250,42.250,-68.383,-68.383) ENVELOPE(37.800,37.800,-69.708,-69.708) ENVELOPE(38.017,38.017,-70.400,-70.400) ENVELOPE(39.083,39.083,-69.767,-69.767) ENVELOPE(39.467,39.467,-69.650,-69.650) ENVELOPE(38.300,38.300,-69.650,-69.650) |
geographic |
East Antarctica Ongul Ongul Island Prince Olav Coast East Ongul Island Skarvsnes Cape Hinode Rundvagshetta Kasumi Rock Austhovde Botnnuten Berrodden Skallen Padda |
geographic_facet |
East Antarctica Ongul Ongul Island Prince Olav Coast East Ongul Island Skarvsnes Cape Hinode Rundvagshetta Kasumi Rock Austhovde Botnnuten Berrodden Skallen Padda |
genre |
Antarc* Antarctica East Antarctica East Ongul Island Ongul Island Prince Olav Coast |
genre_facet |
Antarc* Antarctica East Antarctica East Ongul Island Ongul Island Prince Olav Coast |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2768 http://id.nii.ac.jp/1291/00002768/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 7, 184-185(1994-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2768&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250309917605888 |