Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications
Abstract This paper presents a study of the seismic P−wave velocity and density structure of the lithosphere−asthenosphere system along a 800 km long transect extending from the actively spreading Knipovich Ridge, across southern Spitsbergen to the Kong Karls Land Volcanic Province. The 2D seismic a...
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Online Access: | http://dx.doi.org/10.2478/popore-2013-0011 http://content.sciendo.com/view/journals/popore/34/2/article-p111.xml https://www.degruyter.com/view/j/popore.2013.34.issue-2/popore-2013-0011/popore-2013-0011.pdf |
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crdegruyter:10.2478/popore-2013-0011 2023-05-15T15:13:58+02:00 Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications Krysiński, Lech Grad, Marek Mjelde, Rolf Czuba, Wojciech Guterch, Aleksander 2013 http://dx.doi.org/10.2478/popore-2013-0011 http://content.sciendo.com/view/journals/popore/34/2/article-p111.xml https://www.degruyter.com/view/j/popore.2013.34.issue-2/popore-2013-0011/popore-2013-0011.pdf unknown Walter de Gruyter GmbH Polish Polar Research volume 34, issue 2, page 111-138 ISSN 2081-8262 0138-0338 Ecology Ecology, Evolution, Behavior and Systematics journal-article 2013 crdegruyter https://doi.org/10.2478/popore-2013-0011 2022-04-14T05:11:04Z Abstract This paper presents a study of the seismic P−wave velocity and density structure of the lithosphere−asthenosphere system along a 800 km long transect extending from the actively spreading Knipovich Ridge, across southern Spitsbergen to the Kong Karls Land Volcanic Province. The 2D seismic and density model documents 6-8 km thick oceanic crust formed at the Knipovich Ridge, a distinct continent−ocean−boundary (COB), the east− ern boundary of the dominantly sheared Hornsund Fault Zone, and the eastern boundary of the Early Cenozoic West Spitsbergen Fold−and−Thrust Belt. The crustal continent−ocean transitional zone has significant excess of density (more than 0.1 g/cm 3 in average), charac− teristic for mafic/ultramafic and high−grade metamorphic rocks. The main Caledonian su− ture zone between Laurentia and Barentsia is interpreted based on variations in crustal thickness, velocities and densities. A high velocity body in the lower crust is preferably in− terpreted in terms of Early Cretaceous magmatism channelled from an Arctic source south− wards along the proto−Hornsund zone of weakness. The continental upper mantle expresses high velocities (8.24 km/s) and densities (3.2 g/cm 3 ), which may be interpreted in terms of low heat−flow and composition dominated by dunites. The lower velocities (7.85 km/s) and densities (3.1 g/cm 3 ) observed in the oceanic lithosphere suggest composition dominated by primitive peridotites. The model of mantle allows for successful direct description of subcrustal masses distribution compensating isostatically uneven crustal load. The esti− mated low value of correlation between density and velocity in the mantle 0.12 kg·s·m −4 suggests that horizontal density differences between oceanic and continental mantle would be dominated by compositional changes. Article in Journal/Newspaper Arctic Barents Sea Hornsund Kong Karls Land Polar Research Spitsbergen De Gruyter (via Crossref) Arctic Barents Sea Hornsund ENVELOPE(15.865,15.865,76.979,76.979) Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) Kong Karls Land ENVELOPE(28.000,28.000,78.833,78.833) Polish Polar Research 34 2 111 138 |
institution |
Open Polar |
collection |
De Gruyter (via Crossref) |
op_collection_id |
crdegruyter |
language |
unknown |
topic |
Ecology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Ecology Ecology, Evolution, Behavior and Systematics Krysiński, Lech Grad, Marek Mjelde, Rolf Czuba, Wojciech Guterch, Aleksander Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications |
topic_facet |
Ecology Ecology, Evolution, Behavior and Systematics |
description |
Abstract This paper presents a study of the seismic P−wave velocity and density structure of the lithosphere−asthenosphere system along a 800 km long transect extending from the actively spreading Knipovich Ridge, across southern Spitsbergen to the Kong Karls Land Volcanic Province. The 2D seismic and density model documents 6-8 km thick oceanic crust formed at the Knipovich Ridge, a distinct continent−ocean−boundary (COB), the east− ern boundary of the dominantly sheared Hornsund Fault Zone, and the eastern boundary of the Early Cenozoic West Spitsbergen Fold−and−Thrust Belt. The crustal continent−ocean transitional zone has significant excess of density (more than 0.1 g/cm 3 in average), charac− teristic for mafic/ultramafic and high−grade metamorphic rocks. The main Caledonian su− ture zone between Laurentia and Barentsia is interpreted based on variations in crustal thickness, velocities and densities. A high velocity body in the lower crust is preferably in− terpreted in terms of Early Cretaceous magmatism channelled from an Arctic source south− wards along the proto−Hornsund zone of weakness. The continental upper mantle expresses high velocities (8.24 km/s) and densities (3.2 g/cm 3 ), which may be interpreted in terms of low heat−flow and composition dominated by dunites. The lower velocities (7.85 km/s) and densities (3.1 g/cm 3 ) observed in the oceanic lithosphere suggest composition dominated by primitive peridotites. The model of mantle allows for successful direct description of subcrustal masses distribution compensating isostatically uneven crustal load. The esti− mated low value of correlation between density and velocity in the mantle 0.12 kg·s·m −4 suggests that horizontal density differences between oceanic and continental mantle would be dominated by compositional changes. |
format |
Article in Journal/Newspaper |
author |
Krysiński, Lech Grad, Marek Mjelde, Rolf Czuba, Wojciech Guterch, Aleksander |
author_facet |
Krysiński, Lech Grad, Marek Mjelde, Rolf Czuba, Wojciech Guterch, Aleksander |
author_sort |
Krysiński, Lech |
title |
Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications |
title_short |
Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications |
title_full |
Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications |
title_fullStr |
Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications |
title_full_unstemmed |
Seismic and density structure of the lithosphere−asthenosphere system along transect Knipovich Ridge−Spitsbergen−Barents Sea – geological and petrophysical implications |
title_sort |
seismic and density structure of the lithosphere−asthenosphere system along transect knipovich ridge−spitsbergen−barents sea – geological and petrophysical implications |
publisher |
Walter de Gruyter GmbH |
publishDate |
2013 |
url |
http://dx.doi.org/10.2478/popore-2013-0011 http://content.sciendo.com/view/journals/popore/34/2/article-p111.xml https://www.degruyter.com/view/j/popore.2013.34.issue-2/popore-2013-0011/popore-2013-0011.pdf |
long_lat |
ENVELOPE(15.865,15.865,76.979,76.979) ENVELOPE(7.074,7.074,75.712,75.712) ENVELOPE(28.000,28.000,78.833,78.833) |
geographic |
Arctic Barents Sea Hornsund Knipovich Ridge Kong Karls Land |
geographic_facet |
Arctic Barents Sea Hornsund Knipovich Ridge Kong Karls Land |
genre |
Arctic Barents Sea Hornsund Kong Karls Land Polar Research Spitsbergen |
genre_facet |
Arctic Barents Sea Hornsund Kong Karls Land Polar Research Spitsbergen |
op_source |
Polish Polar Research volume 34, issue 2, page 111-138 ISSN 2081-8262 0138-0338 |
op_doi |
https://doi.org/10.2478/popore-2013-0011 |
container_title |
Polish Polar Research |
container_volume |
34 |
container_issue |
2 |
container_start_page |
111 |
op_container_end_page |
138 |
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1766344480175161344 |