SUBMARINE CANYONS IN THE BELLINGSHAUSEN AND RIISER-LARSEN SEAS AROUND ANTARCTICA
Submarine canyons in the Bellingshausen and Riiser-Larsen Seas are compared. It is pointed out that the canyons in the Bellingshausen Sea are so incorporated to build up a deep-sea fan or an apron slope, that they develop dominantly on an upper fan at the upper continental rise and disappear apparen...
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Faculty of Science, Josai University
1991
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ftnipr:oai:nipr.repo.nii.ac.jp:00002690 2023-05-15T13:48:59+02:00 SUBMARINE CANYONS IN THE BELLINGSHAUSEN AND RIISER-LARSEN SEAS AROUND ANTARCTICA カガミ ヒデオ クラモチ ヒロミ シマ ヨウコ Hideo KAGAMI Hiromi KURAMOCHI Yoko SHIMA 1991-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2690 http://id.nii.ac.jp/1291/00002690/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2690&item_no=1&attribute_id=18&file_no=1 en eng Faculty of Science, Josai University Department of Geology, Kochi University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2690 http://id.nii.ac.jp/1291/00002690/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 5, 84-98(1991-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2690&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1991 ftnipr 2022-11-26T19:42:11Z Submarine canyons in the Bellingshausen and Riiser-Larsen Seas are compared. It is pointed out that the canyons in the Bellingshausen Sea are so incorporated to build up a deep-sea fan or an apron slope, that they develop dominantly on an upper fan at the upper continental rise and disappear apparently on a lower fan at the lower continental rise. The deep-sea fan or the apron slope was formed by supply of the great amount of sediments from the shelf area due probably to grounded ice sheets on the continental margin. On the contrary, the canyons in the Riiser-Larsen Sea have a large-scale entrenching throughout their course and construct a canyon-deep sea channel complex. This is caused by thermal cooling effect of lithosphere to deepen the old ocean basin. Buried canyons observed on the seismic profiles indicate that activation of the canyon formation was triggered by advancement of the Antarctic ice sheet toward the outer edge of the continental shelf sometime between 4 and 7 Ma BP. The meltwater and eroded sediments by the extended grounded ice sheet provided a potential source for turbidity currents and debris flows into the canyons, thus causing rigorous development of the canyon. Report Antarc* Antarctic Antarctica Bellingshausen Sea Ice Sheet Riiser-Larsen Sea National Institute of Polar Research Repository, Japan Antarctic The Antarctic Bellingshausen Sea Riiser-Larsen ENVELOPE(50.667,50.667,-66.783,-66.783) Riiser-Larsen Sea ENVELOPE(24.000,24.000,-68.000,-68.000) |
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Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Submarine canyons in the Bellingshausen and Riiser-Larsen Seas are compared. It is pointed out that the canyons in the Bellingshausen Sea are so incorporated to build up a deep-sea fan or an apron slope, that they develop dominantly on an upper fan at the upper continental rise and disappear apparently on a lower fan at the lower continental rise. The deep-sea fan or the apron slope was formed by supply of the great amount of sediments from the shelf area due probably to grounded ice sheets on the continental margin. On the contrary, the canyons in the Riiser-Larsen Sea have a large-scale entrenching throughout their course and construct a canyon-deep sea channel complex. This is caused by thermal cooling effect of lithosphere to deepen the old ocean basin. Buried canyons observed on the seismic profiles indicate that activation of the canyon formation was triggered by advancement of the Antarctic ice sheet toward the outer edge of the continental shelf sometime between 4 and 7 Ma BP. The meltwater and eroded sediments by the extended grounded ice sheet provided a potential source for turbidity currents and debris flows into the canyons, thus causing rigorous development of the canyon. |
format |
Report |
author |
カガミ ヒデオ クラモチ ヒロミ シマ ヨウコ Hideo KAGAMI Hiromi KURAMOCHI Yoko SHIMA |
spellingShingle |
カガミ ヒデオ クラモチ ヒロミ シマ ヨウコ Hideo KAGAMI Hiromi KURAMOCHI Yoko SHIMA SUBMARINE CANYONS IN THE BELLINGSHAUSEN AND RIISER-LARSEN SEAS AROUND ANTARCTICA |
author_facet |
カガミ ヒデオ クラモチ ヒロミ シマ ヨウコ Hideo KAGAMI Hiromi KURAMOCHI Yoko SHIMA |
author_sort |
カガミ ヒデオ |
title |
SUBMARINE CANYONS IN THE BELLINGSHAUSEN AND RIISER-LARSEN SEAS AROUND ANTARCTICA |
title_short |
SUBMARINE CANYONS IN THE BELLINGSHAUSEN AND RIISER-LARSEN SEAS AROUND ANTARCTICA |
title_full |
SUBMARINE CANYONS IN THE BELLINGSHAUSEN AND RIISER-LARSEN SEAS AROUND ANTARCTICA |
title_fullStr |
SUBMARINE CANYONS IN THE BELLINGSHAUSEN AND RIISER-LARSEN SEAS AROUND ANTARCTICA |
title_full_unstemmed |
SUBMARINE CANYONS IN THE BELLINGSHAUSEN AND RIISER-LARSEN SEAS AROUND ANTARCTICA |
title_sort |
submarine canyons in the bellingshausen and riiser-larsen seas around antarctica |
publisher |
Faculty of Science, Josai University |
publishDate |
1991 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2690 http://id.nii.ac.jp/1291/00002690/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2690&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(50.667,50.667,-66.783,-66.783) ENVELOPE(24.000,24.000,-68.000,-68.000) |
geographic |
Antarctic The Antarctic Bellingshausen Sea Riiser-Larsen Riiser-Larsen Sea |
geographic_facet |
Antarctic The Antarctic Bellingshausen Sea Riiser-Larsen Riiser-Larsen Sea |
genre |
Antarc* Antarctic Antarctica Bellingshausen Sea Ice Sheet Riiser-Larsen Sea |
genre_facet |
Antarc* Antarctic Antarctica Bellingshausen Sea Ice Sheet Riiser-Larsen Sea |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2690 http://id.nii.ac.jp/1291/00002690/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 5, 84-98(1991-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2690&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250296832425984 |