Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea

A 410 km long Ocean Bottom Seismometer profile spanning from the Bear Island, Barents Sea to oceanic crust formed along the Mohns Ridge has been modelled by use of ray-tracing with regard to observed P-waves. The northeastern part of the model represents typical continental crust, thinned from ca. 3...

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Published in:Geophysical Journal International
Main Authors: Czuba, W., Grad, M., Mjelde, R., Guterch, A., Libak, A., Krüger, F., Murai, Y., Schweitzer, J., Schmidt-Aursch, Mechita C., Faleide, J. I.
Format: Article in Journal/Newspaper
Language:unknown
Published: 2011
Subjects:
Online Access:https://epic.awi.de/id/eprint/25700/
https://doi.org/10.1111/j.1365-246X.2010.04873.x
https://hdl.handle.net/10013/epic.38700
id ftawi:oai:epic.awi.de:25700
record_format openpolar
spelling ftawi:oai:epic.awi.de:25700 2024-09-09T19:32:11+00:00 Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea Czuba, W. Grad, M. Mjelde, R. Guterch, A. Libak, A. Krüger, F. Murai, Y. Schweitzer, J. Schmidt-Aursch, Mechita C. Faleide, J. I. 2011-02 https://epic.awi.de/id/eprint/25700/ https://doi.org/10.1111/j.1365-246X.2010.04873.x https://hdl.handle.net/10013/epic.38700 unknown Czuba, W. , Grad, M. , Mjelde, R. , Guterch, A. , Libak, A. , Krüger, F. , Murai, Y. , Schweitzer, J. , Schmidt-Aursch, M. C. orcid:0000-0002-2393-4514 and Faleide, J. I. (2011) Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea , Geophysical Journal International, 184 (2), pp. 541-554 . doi:10.1111/j.1365-246X.2010.04873.x <https://doi.org/10.1111/j.1365-246X.2010.04873.x> , hdl:10013/epic.38700 EPIC3Geophysical Journal International, 184(2), pp. 541-554 Article isiRev 2011 ftawi https://doi.org/10.1111/j.1365-246X.2010.04873.x 2024-06-24T04:03:41Z A 410 km long Ocean Bottom Seismometer profile spanning from the Bear Island, Barents Sea to oceanic crust formed along the Mohns Ridge has been modelled by use of ray-tracing with regard to observed P-waves. The northeastern part of the model represents typical continental crust, thinned from ca. 30 km thickness beneath the Bear Island to ca. 13 km within the Continent–Ocean-Transition. Between the Hornsund FZ and the Knølegga Fault, a 3–4 km thick sedimentary basin, dominantly of Permian/Carboniferous age, is modelled beneath the ca. 1.5 km thick layer of volcanics (Vestbakken Volcanic Province). The P-wave velocity in the 3–4 km thick lowermost continental crust is significantly higher than normal (ca. 7.5 km s–1). We interpret this layer as a mixture of mafic intrusions and continental crystalline blocks, dominantly related to the Paleocene-Early Eocene rifting event. The crystalline portion of the crust within the south-western part of the COT consists of a ca. 30 km wide and ca. 6 km thick high-velocity (7.3 km s–1) body. We interpret the body as a ridge of serpentinized peridotites. The magmatic portion of the ocean crust accreted along the Knipovich Ridge from continental break-up at ca. 35 Ma until ca. 20 Ma is 3–5 km thicker than normal. We interpret the increased magmatism as a passive response to the bending of this southernmost part of the Knipovich Ridge. The thickness of the magmatic portion of the crust formed along the Mohns Ridge at ca. 20 Ma decreases to ca. 3 km, which is normal for ultra slow spreading ridges. Article in Journal/Newspaper Barents Sea Bear Island Hornsund Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Barents Sea Bear Island ENVELOPE(-67.250,-67.250,-68.151,-68.151) Hornsund ENVELOPE(15.865,15.865,76.979,76.979) Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) Vestbakken ENVELOPE(16.250,16.250,74.417,74.417) Geophysical Journal International 184 2 541 554
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
description A 410 km long Ocean Bottom Seismometer profile spanning from the Bear Island, Barents Sea to oceanic crust formed along the Mohns Ridge has been modelled by use of ray-tracing with regard to observed P-waves. The northeastern part of the model represents typical continental crust, thinned from ca. 30 km thickness beneath the Bear Island to ca. 13 km within the Continent–Ocean-Transition. Between the Hornsund FZ and the Knølegga Fault, a 3–4 km thick sedimentary basin, dominantly of Permian/Carboniferous age, is modelled beneath the ca. 1.5 km thick layer of volcanics (Vestbakken Volcanic Province). The P-wave velocity in the 3–4 km thick lowermost continental crust is significantly higher than normal (ca. 7.5 km s–1). We interpret this layer as a mixture of mafic intrusions and continental crystalline blocks, dominantly related to the Paleocene-Early Eocene rifting event. The crystalline portion of the crust within the south-western part of the COT consists of a ca. 30 km wide and ca. 6 km thick high-velocity (7.3 km s–1) body. We interpret the body as a ridge of serpentinized peridotites. The magmatic portion of the ocean crust accreted along the Knipovich Ridge from continental break-up at ca. 35 Ma until ca. 20 Ma is 3–5 km thicker than normal. We interpret the increased magmatism as a passive response to the bending of this southernmost part of the Knipovich Ridge. The thickness of the magmatic portion of the crust formed along the Mohns Ridge at ca. 20 Ma decreases to ca. 3 km, which is normal for ultra slow spreading ridges.
format Article in Journal/Newspaper
author Czuba, W.
Grad, M.
Mjelde, R.
Guterch, A.
Libak, A.
Krüger, F.
Murai, Y.
Schweitzer, J.
Schmidt-Aursch, Mechita C.
Faleide, J. I.
spellingShingle Czuba, W.
Grad, M.
Mjelde, R.
Guterch, A.
Libak, A.
Krüger, F.
Murai, Y.
Schweitzer, J.
Schmidt-Aursch, Mechita C.
Faleide, J. I.
Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea
author_facet Czuba, W.
Grad, M.
Mjelde, R.
Guterch, A.
Libak, A.
Krüger, F.
Murai, Y.
Schweitzer, J.
Schmidt-Aursch, Mechita C.
Faleide, J. I.
author_sort Czuba, W.
title Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea
title_short Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea
title_full Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea
title_fullStr Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea
title_full_unstemmed Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea
title_sort continent–ocean-transition across a trans-tensional margin segment: off bear island, barents sea
publishDate 2011
url https://epic.awi.de/id/eprint/25700/
https://doi.org/10.1111/j.1365-246X.2010.04873.x
https://hdl.handle.net/10013/epic.38700
long_lat ENVELOPE(-67.250,-67.250,-68.151,-68.151)
ENVELOPE(15.865,15.865,76.979,76.979)
ENVELOPE(7.074,7.074,75.712,75.712)
ENVELOPE(16.250,16.250,74.417,74.417)
geographic Barents Sea
Bear Island
Hornsund
Knipovich Ridge
Vestbakken
geographic_facet Barents Sea
Bear Island
Hornsund
Knipovich Ridge
Vestbakken
genre Barents Sea
Bear Island
Hornsund
genre_facet Barents Sea
Bear Island
Hornsund
op_source EPIC3Geophysical Journal International, 184(2), pp. 541-554
op_relation Czuba, W. , Grad, M. , Mjelde, R. , Guterch, A. , Libak, A. , Krüger, F. , Murai, Y. , Schweitzer, J. , Schmidt-Aursch, M. C. orcid:0000-0002-2393-4514 and Faleide, J. I. (2011) Continent–ocean-transition across a trans-tensional margin segment: off Bear Island, Barents Sea , Geophysical Journal International, 184 (2), pp. 541-554 . doi:10.1111/j.1365-246X.2010.04873.x <https://doi.org/10.1111/j.1365-246X.2010.04873.x> , hdl:10013/epic.38700
op_doi https://doi.org/10.1111/j.1365-246X.2010.04873.x
container_title Geophysical Journal International
container_volume 184
container_issue 2
container_start_page 541
op_container_end_page 554
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