A geophysical study of the northern Svalbard continental margin
In the summer of 1999, the first systematic seismic profiles were acquired across the northern Svalbard continental margin east of 15°E. Approximately 1470 km of multi-channel seismic reflection data as well as sonobuoy wide-angle data were collected up to 82°N. With few exceptions the signals image...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_231241 2023-05-15T16:34:38+02:00 A geophysical study of the northern Svalbard continental margin Geissler, W. Jokat, W. 2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum 2004 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_231241 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231241_2/component/file_2204916/231241.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-246X.2004.02315.x https://gfzpublic.gfz-potsdam.de/pubman/item/item_231241 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231241_2/component/file_2204916/231241.pdf info:eu-repo/semantics/openAccess Geophysical Journal International 550 - Earth sciences info:eu-repo/semantics/article 2004 ftgfzpotsdam https://doi.org/10.1111/j.1365-246X.2004.02315.x 2022-09-14T05:55:48Z In the summer of 1999, the first systematic seismic profiles were acquired across the northern Svalbard continental margin east of 15°E. Approximately 1470 km of multi-channel seismic reflection data as well as sonobuoy wide-angle data were collected up to 82°N. With few exceptions the signals imaged the whole sedimentary cover down to the acoustic basement. The uppermost sedimentary deposits of the inner shelf yield P-wave velocities of 2 km s 1 and higher, indicating erosion and compaction due to a former ice load. The inner shelf east of Hinlopen Strait has only a thin veneer of over-consolidated sediments above the acoustic basement. Beneath the outer shelf, up to 3.5 km of sedimentary deposits cover the down-faulted acoustic basement. The continental slope is heavily eroded due to bottom current activity and slumping. At about 30°E the morphology of the continental slope has a smooth appearance. Shelf progradation only in the vicinity of glacial troughs crossing the shelf (associated with submarine fans) indicates main sediment transport by ice streams during former glacial periods. The maximum sedimentary thickness in the Sophia Basin is more than 9 km, and the Nansen Basin has a sediment thickness of 4.5 km close to the margin. Gravity modelling along the seismic profiles was performed to constrain the position of the continent-ocean transition. Existing sedimentary thickness and structural maps were extended over the area investigated. The new data provide no evidence for the presence of former extensive subaerial volcanic sequences (seaward-dipping reflectors), which would have been emplaced during the break-up along the margin. Thus, we consider this part of the margin as non-volcanic. Article in Journal/Newspaper Hinlopen Strait Nansen Basin Svalbard GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Svalbard Geophysical Journal International 158 1 50 66 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Geissler, W. Jokat, W. A geophysical study of the northern Svalbard continental margin |
topic_facet |
550 - Earth sciences |
description |
In the summer of 1999, the first systematic seismic profiles were acquired across the northern Svalbard continental margin east of 15°E. Approximately 1470 km of multi-channel seismic reflection data as well as sonobuoy wide-angle data were collected up to 82°N. With few exceptions the signals imaged the whole sedimentary cover down to the acoustic basement. The uppermost sedimentary deposits of the inner shelf yield P-wave velocities of 2 km s 1 and higher, indicating erosion and compaction due to a former ice load. The inner shelf east of Hinlopen Strait has only a thin veneer of over-consolidated sediments above the acoustic basement. Beneath the outer shelf, up to 3.5 km of sedimentary deposits cover the down-faulted acoustic basement. The continental slope is heavily eroded due to bottom current activity and slumping. At about 30°E the morphology of the continental slope has a smooth appearance. Shelf progradation only in the vicinity of glacial troughs crossing the shelf (associated with submarine fans) indicates main sediment transport by ice streams during former glacial periods. The maximum sedimentary thickness in the Sophia Basin is more than 9 km, and the Nansen Basin has a sediment thickness of 4.5 km close to the margin. Gravity modelling along the seismic profiles was performed to constrain the position of the continent-ocean transition. Existing sedimentary thickness and structural maps were extended over the area investigated. The new data provide no evidence for the presence of former extensive subaerial volcanic sequences (seaward-dipping reflectors), which would have been emplaced during the break-up along the margin. Thus, we consider this part of the margin as non-volcanic. |
author2 |
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum |
format |
Article in Journal/Newspaper |
author |
Geissler, W. Jokat, W. |
author_facet |
Geissler, W. Jokat, W. |
author_sort |
Geissler, W. |
title |
A geophysical study of the northern Svalbard continental margin |
title_short |
A geophysical study of the northern Svalbard continental margin |
title_full |
A geophysical study of the northern Svalbard continental margin |
title_fullStr |
A geophysical study of the northern Svalbard continental margin |
title_full_unstemmed |
A geophysical study of the northern Svalbard continental margin |
title_sort |
geophysical study of the northern svalbard continental margin |
publishDate |
2004 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_231241 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231241_2/component/file_2204916/231241.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Hinlopen Strait Nansen Basin Svalbard |
genre_facet |
Hinlopen Strait Nansen Basin Svalbard |
op_source |
Geophysical Journal International |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-246X.2004.02315.x https://gfzpublic.gfz-potsdam.de/pubman/item/item_231241 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231241_2/component/file_2204916/231241.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/j.1365-246X.2004.02315.x |
container_title |
Geophysical Journal International |
container_volume |
158 |
container_issue |
1 |
container_start_page |
50 |
op_container_end_page |
66 |
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1766024604586868736 |