Crustal domains in the Western Barents Sea
The crustal architecture of the Barents Sea is still enigmatic due to complex evolution during the Timanian and Caledonian orogeny events, further complicated by several rifting episodes. In this study we present the new results on the crustal structure of the Caledonian–Timanian transition zone in...
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Oxford University Press
2021
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Online Access: | https://hdl.handle.net/11250/2982690 https://doi.org/10.1093/GJI/GGAA112 |
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ftunivbergen:oai:bora.uib.no:11250/2982690 2023-05-15T15:38:35+02:00 Crustal domains in the Western Barents Sea Shulgin, Alexey A Faleide, Jan Inge Mjelde, Rolf Breivik, Asbjørn Johan Huismans, Ritske Sipke 2021 application/pdf https://hdl.handle.net/11250/2982690 https://doi.org/10.1093/GJI/GGAA112 eng eng Oxford University Press urn:issn:0956-540X https://hdl.handle.net/11250/2982690 https://doi.org/10.1093/GJI/GGAA112 cristin:1922111 Geophysical Journal International. 2021, 221 (3), 2155-2169. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright The Author(s) 2020 Geophysical Journal International 2155-2169 221 3 Journal article Peer reviewed 2021 ftunivbergen https://doi.org/10.1093/GJI/GGAA112 2023-03-14T17:40:13Z The crustal architecture of the Barents Sea is still enigmatic due to complex evolution during the Timanian and Caledonian orogeny events, further complicated by several rifting episodes. In this study we present the new results on the crustal structure of the Caledonian–Timanian transition zone in the western Barents. We extend the work of Aarseth et al. (2017), by utilizing the seismic tomography approach to model Vp, Vs and Vp/Vs ratio, combined with the reprocessed seismic reflection line, and further complemented with gravity modelling. Based on our models we document in 3-D the position of the Caledonian nappes in the western Barents Sea. We find that the Caledonian domain is characterized by high crustal reflectivity, caused by strong deformation and/or emplacement of mafic intrusions within the crystalline crust. The Timanian domain shows semi-transparent crust with little internal reflectivity, suggesting less deformation. We find, that the eastern branch of the earlier proposed Caledonian suture, cannot be associated with the Caledonian event, but can rather be a relict from the Timanian terrane assemblance, marking one of the crustal microblocks. This crustal block may have an E–W striking southern boundary, along which the Caledonian nappes were offset. A high-velocity/density crustal body, adjacent to the Caledonian–Timanian contact zone, is interpreted as a zone of metamorphosed rocks based on the comparison with global compilations. The orientation of this body correlates with regional gravity maxima zone. Two scenarios for the origin of the body are proposed: mafic emplacement during the Timanian assembly, or massive mafic intrusions associated with the Devonian extension. publishedVersion Article in Journal/Newspaper Barents Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Barents Sea Geophysical Journal International 221 3 2155 2169 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
The crustal architecture of the Barents Sea is still enigmatic due to complex evolution during the Timanian and Caledonian orogeny events, further complicated by several rifting episodes. In this study we present the new results on the crustal structure of the Caledonian–Timanian transition zone in the western Barents. We extend the work of Aarseth et al. (2017), by utilizing the seismic tomography approach to model Vp, Vs and Vp/Vs ratio, combined with the reprocessed seismic reflection line, and further complemented with gravity modelling. Based on our models we document in 3-D the position of the Caledonian nappes in the western Barents Sea. We find that the Caledonian domain is characterized by high crustal reflectivity, caused by strong deformation and/or emplacement of mafic intrusions within the crystalline crust. The Timanian domain shows semi-transparent crust with little internal reflectivity, suggesting less deformation. We find, that the eastern branch of the earlier proposed Caledonian suture, cannot be associated with the Caledonian event, but can rather be a relict from the Timanian terrane assemblance, marking one of the crustal microblocks. This crustal block may have an E–W striking southern boundary, along which the Caledonian nappes were offset. A high-velocity/density crustal body, adjacent to the Caledonian–Timanian contact zone, is interpreted as a zone of metamorphosed rocks based on the comparison with global compilations. The orientation of this body correlates with regional gravity maxima zone. Two scenarios for the origin of the body are proposed: mafic emplacement during the Timanian assembly, or massive mafic intrusions associated with the Devonian extension. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Shulgin, Alexey A Faleide, Jan Inge Mjelde, Rolf Breivik, Asbjørn Johan Huismans, Ritske Sipke |
spellingShingle |
Shulgin, Alexey A Faleide, Jan Inge Mjelde, Rolf Breivik, Asbjørn Johan Huismans, Ritske Sipke Crustal domains in the Western Barents Sea |
author_facet |
Shulgin, Alexey A Faleide, Jan Inge Mjelde, Rolf Breivik, Asbjørn Johan Huismans, Ritske Sipke |
author_sort |
Shulgin, Alexey A |
title |
Crustal domains in the Western Barents Sea |
title_short |
Crustal domains in the Western Barents Sea |
title_full |
Crustal domains in the Western Barents Sea |
title_fullStr |
Crustal domains in the Western Barents Sea |
title_full_unstemmed |
Crustal domains in the Western Barents Sea |
title_sort |
crustal domains in the western barents sea |
publisher |
Oxford University Press |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2982690 https://doi.org/10.1093/GJI/GGAA112 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
Geophysical Journal International 2155-2169 221 3 |
op_relation |
urn:issn:0956-540X https://hdl.handle.net/11250/2982690 https://doi.org/10.1093/GJI/GGAA112 cristin:1922111 Geophysical Journal International. 2021, 221 (3), 2155-2169. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright The Author(s) 2020 |
op_doi |
https://doi.org/10.1093/GJI/GGAA112 |
container_title |
Geophysical Journal International |
container_volume |
221 |
container_issue |
3 |
container_start_page |
2155 |
op_container_end_page |
2169 |
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1766369679532621824 |