An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust
This paper describes results from a geophysical study in the Vestbakken Volcanic Province, located on the central parts of the western Barents Sea continental margin, and adjacent oceanic crust in the Norwegian-Greenland Sea. The results are derived mainly from interpretation and modeling of multich...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/49692 2023-05-15T15:38:39+02:00 An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust Libak, Audun Mjelde, Rolf Keers, Henk Faleide, Jan Inge Murai, Yoshio http://hdl.handle.net/2115/49692 https://doi.org/10.1007/s11001-012-9155-3 eng eng Springer Netherlands http://hdl.handle.net/2115/49692 Marine Geophysical Research, 33(2): 185-207 http://dx.doi.org/10.1007/s11001-012-9155-3 The final publication is available at www.springerlink.com Seismic modeling Ocean bottom seismometer Mafic feeder dykes Oceanic and continental crust Vestbakken Volcanic Province 453 article (author version) fthokunivhus https://doi.org/10.1007/s11001-012-9155-3 2022-11-18T01:02:25Z This paper describes results from a geophysical study in the Vestbakken Volcanic Province, located on the central parts of the western Barents Sea continental margin, and adjacent oceanic crust in the Norwegian-Greenland Sea. The results are derived mainly from interpretation and modeling of multichannel seismic, ocean bottom seismometer and land station data along a regional seismic profile. The resulting model shows oceanic crust in the western parts of the profile. This crust is buried by a thick Cenozoic sedimentary package. Low velocities in the bottom of this package indicate overpressure. The igneous oceanic crust shows an average thickness of 7.2 km with the thinnest crust (5-6 km) in the southwest and the thickest crust (8-9 km) close to the continent-ocean boundary (COB). The thick oceanic crust is probably related to high mantle temperatures formed by brittle weakening and shear heating prior to continental breakup. The COB is interpreted in the central parts of the profile where the velocity structure and Bouguer anomalies change significantly. East of the COB Moho depths increase while the vertical velocity gradient decreases. Below the assumed center for Early Eocene volcanic activity the model shows increased velocities in the crust. These increased crustal velocities are interpreted to represent Early Eocene mafic feeder dykes. East of the zone of volcanoes velocities in the crust decrease and sedimentary velocities are observed at depths of more than 10 km. The amount of crustal intrusions is much lower in this area than farther west. East of the Knølegga Fault crystalline basement velocities are brought close to the seabed. This fault marks the eastern limit of thick Cenozoic and Mesozoic packages on central parts of the western Barents Sea continental margin. Article in Journal/Newspaper Barents Sea Greenland Greenland Sea Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Barents Sea Greenland Vestbakken ENVELOPE(16.250,16.250,74.417,74.417) Marine Geophysical Research 33 2 185 207 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Seismic modeling Ocean bottom seismometer Mafic feeder dykes Oceanic and continental crust Vestbakken Volcanic Province 453 |
spellingShingle |
Seismic modeling Ocean bottom seismometer Mafic feeder dykes Oceanic and continental crust Vestbakken Volcanic Province 453 Libak, Audun Mjelde, Rolf Keers, Henk Faleide, Jan Inge Murai, Yoshio An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust |
topic_facet |
Seismic modeling Ocean bottom seismometer Mafic feeder dykes Oceanic and continental crust Vestbakken Volcanic Province 453 |
description |
This paper describes results from a geophysical study in the Vestbakken Volcanic Province, located on the central parts of the western Barents Sea continental margin, and adjacent oceanic crust in the Norwegian-Greenland Sea. The results are derived mainly from interpretation and modeling of multichannel seismic, ocean bottom seismometer and land station data along a regional seismic profile. The resulting model shows oceanic crust in the western parts of the profile. This crust is buried by a thick Cenozoic sedimentary package. Low velocities in the bottom of this package indicate overpressure. The igneous oceanic crust shows an average thickness of 7.2 km with the thinnest crust (5-6 km) in the southwest and the thickest crust (8-9 km) close to the continent-ocean boundary (COB). The thick oceanic crust is probably related to high mantle temperatures formed by brittle weakening and shear heating prior to continental breakup. The COB is interpreted in the central parts of the profile where the velocity structure and Bouguer anomalies change significantly. East of the COB Moho depths increase while the vertical velocity gradient decreases. Below the assumed center for Early Eocene volcanic activity the model shows increased velocities in the crust. These increased crustal velocities are interpreted to represent Early Eocene mafic feeder dykes. East of the zone of volcanoes velocities in the crust decrease and sedimentary velocities are observed at depths of more than 10 km. The amount of crustal intrusions is much lower in this area than farther west. East of the Knølegga Fault crystalline basement velocities are brought close to the seabed. This fault marks the eastern limit of thick Cenozoic and Mesozoic packages on central parts of the western Barents Sea continental margin. |
format |
Article in Journal/Newspaper |
author |
Libak, Audun Mjelde, Rolf Keers, Henk Faleide, Jan Inge Murai, Yoshio |
author_facet |
Libak, Audun Mjelde, Rolf Keers, Henk Faleide, Jan Inge Murai, Yoshio |
author_sort |
Libak, Audun |
title |
An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust |
title_short |
An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust |
title_full |
An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust |
title_fullStr |
An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust |
title_full_unstemmed |
An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust |
title_sort |
integrated geophysical study of vestbakken volcanic province, western barents sea continental margin, and adjacent oceanic crust |
publisher |
Springer Netherlands |
url |
http://hdl.handle.net/2115/49692 https://doi.org/10.1007/s11001-012-9155-3 |
long_lat |
ENVELOPE(16.250,16.250,74.417,74.417) |
geographic |
Barents Sea Greenland Vestbakken |
geographic_facet |
Barents Sea Greenland Vestbakken |
genre |
Barents Sea Greenland Greenland Sea |
genre_facet |
Barents Sea Greenland Greenland Sea |
op_relation |
http://hdl.handle.net/2115/49692 Marine Geophysical Research, 33(2): 185-207 http://dx.doi.org/10.1007/s11001-012-9155-3 |
op_rights |
The final publication is available at www.springerlink.com |
op_doi |
https://doi.org/10.1007/s11001-012-9155-3 |
container_title |
Marine Geophysical Research |
container_volume |
33 |
container_issue |
2 |
container_start_page |
185 |
op_container_end_page |
207 |
_version_ |
1766369861539201024 |