Structure of the Flemish Cap margin, Newfoundland:Insights into mantle and crustal processes during continental breakup
Seismic reflection and refraction data from the Flemish Cap margin off Newfoundland reveal the large-scale structure of a magma-starved rifted margin. There is little evidence for significant extensional deformation of the Flemish Cap, consistent with the hypothesis that it behaved as a microplate t...
Published in: | Geological Society, London, Special Publications |
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ftcopenhagenunip:oai:pure.atira.dk:publications/777c8620-8042-486c-b61d-81d1af215852 2024-06-09T07:47:52+00:00 Structure of the Flemish Cap margin, Newfoundland:Insights into mantle and crustal processes during continental breakup Hopper, J. R. Funck, T. Tucholke, B. E. 2007 https://curis.ku.dk/portal/da/publications/structure-of-the-flemish-cap-margin-newfoundland(777c8620-8042-486c-b61d-81d1af215852).html https://doi.org/10.1144/SP282.3 http://www.scopus.com/inward/record.url?scp=34548261870&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Hopper , J R , Funck , T & Tucholke , B E 2007 , ' Structure of the Flemish Cap margin, Newfoundland : Insights into mantle and crustal processes during continental breakup ' , Geological Society Special Publication , pp. 47-61 . https://doi.org/10.1144/SP282.3 article 2007 ftcopenhagenunip https://doi.org/10.1144/SP282.3 2024-05-16T11:29:29Z Seismic reflection and refraction data from the Flemish Cap margin off Newfoundland reveal the large-scale structure of a magma-starved rifted margin. There is little evidence for significant extensional deformation of the Flemish Cap, consistent with the hypothesis that it behaved as a microplate throughout the Mesozoic. The seismic data highlight important asymmetries at a variety of scales that developed during the final stages of continental breakup and the onset of oceanic sea-floor spreading. In strong contrast to the conjugate Galicia Bank margin, Flemish Cap shows: (1) an abrupt necking profile in cointinental crust, thinning from 30 km thick to 3 km thick over a distance of 80 km, and a narrow, less than 20 km-wide, zone of extremely thin continental crust; (2) no clear evidence for horizontal detachment structures beneath continental crust similar to the 'S' reflection; and (3) evidence for at least a 60 km-wide zone of anomalously thin oceanic crust that began accreting to the margin shortly after continental crustal separation. The oceanic crust averages only 3-4 km thick and in places is as thin as 1.3 km thick, although seismic layer 3 is missing where this occurs. The data suggest that there are large spatial and temporal variations in the available melt supply following continental breakup as oceanic sea-floor spreading becomes established. In addition, wide-angle data show that anomalously slow mande P-wave velocities appew approximately where continental crust has thinned to 6-8 km thick, indicating that low-degree serpentinization begins where the entire crust has become embrittled. Article in Journal/Newspaper Newfoundland University of Copenhagen: Research Geological Society, London, Special Publications 282 1 47 61 |
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Open Polar |
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University of Copenhagen: Research |
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ftcopenhagenunip |
language |
English |
description |
Seismic reflection and refraction data from the Flemish Cap margin off Newfoundland reveal the large-scale structure of a magma-starved rifted margin. There is little evidence for significant extensional deformation of the Flemish Cap, consistent with the hypothesis that it behaved as a microplate throughout the Mesozoic. The seismic data highlight important asymmetries at a variety of scales that developed during the final stages of continental breakup and the onset of oceanic sea-floor spreading. In strong contrast to the conjugate Galicia Bank margin, Flemish Cap shows: (1) an abrupt necking profile in cointinental crust, thinning from 30 km thick to 3 km thick over a distance of 80 km, and a narrow, less than 20 km-wide, zone of extremely thin continental crust; (2) no clear evidence for horizontal detachment structures beneath continental crust similar to the 'S' reflection; and (3) evidence for at least a 60 km-wide zone of anomalously thin oceanic crust that began accreting to the margin shortly after continental crustal separation. The oceanic crust averages only 3-4 km thick and in places is as thin as 1.3 km thick, although seismic layer 3 is missing where this occurs. The data suggest that there are large spatial and temporal variations in the available melt supply following continental breakup as oceanic sea-floor spreading becomes established. In addition, wide-angle data show that anomalously slow mande P-wave velocities appew approximately where continental crust has thinned to 6-8 km thick, indicating that low-degree serpentinization begins where the entire crust has become embrittled. |
format |
Article in Journal/Newspaper |
author |
Hopper, J. R. Funck, T. Tucholke, B. E. |
spellingShingle |
Hopper, J. R. Funck, T. Tucholke, B. E. Structure of the Flemish Cap margin, Newfoundland:Insights into mantle and crustal processes during continental breakup |
author_facet |
Hopper, J. R. Funck, T. Tucholke, B. E. |
author_sort |
Hopper, J. R. |
title |
Structure of the Flemish Cap margin, Newfoundland:Insights into mantle and crustal processes during continental breakup |
title_short |
Structure of the Flemish Cap margin, Newfoundland:Insights into mantle and crustal processes during continental breakup |
title_full |
Structure of the Flemish Cap margin, Newfoundland:Insights into mantle and crustal processes during continental breakup |
title_fullStr |
Structure of the Flemish Cap margin, Newfoundland:Insights into mantle and crustal processes during continental breakup |
title_full_unstemmed |
Structure of the Flemish Cap margin, Newfoundland:Insights into mantle and crustal processes during continental breakup |
title_sort |
structure of the flemish cap margin, newfoundland:insights into mantle and crustal processes during continental breakup |
publishDate |
2007 |
url |
https://curis.ku.dk/portal/da/publications/structure-of-the-flemish-cap-margin-newfoundland(777c8620-8042-486c-b61d-81d1af215852).html https://doi.org/10.1144/SP282.3 http://www.scopus.com/inward/record.url?scp=34548261870&partnerID=8YFLogxK |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Hopper , J R , Funck , T & Tucholke , B E 2007 , ' Structure of the Flemish Cap margin, Newfoundland : Insights into mantle and crustal processes during continental breakup ' , Geological Society Special Publication , pp. 47-61 . https://doi.org/10.1144/SP282.3 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1144/SP282.3 |
container_title |
Geological Society, London, Special Publications |
container_volume |
282 |
container_issue |
1 |
container_start_page |
47 |
op_container_end_page |
61 |
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1801379336914206720 |