Seismic-profiler investigation of the continental margin northeast of Newfoundland
Continuous seismic profiler recordings over the continental shelf northeast of Newfoundland show an accumulation of unconsolidated sediments ranging in thickness from 30 to 150 m, unconformably over-lying bedrock that dips gently eastward toward the continental slope. The distribution of these uncon...
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Canadian Science Publishing
1968
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Online Access: | http://dx.doi.org/10.1139/e68-117 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-117 |
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crcansciencepubl:10.1139/e68-117 2023-12-17T10:43:37+01:00 Seismic-profiler investigation of the continental margin northeast of Newfoundland Grant, A. C. 1968 http://dx.doi.org/10.1139/e68-117 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-117 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 5, issue 5, page 1187-1198 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1968 crcansciencepubl https://doi.org/10.1139/e68-117 2023-11-19T13:38:58Z Continuous seismic profiler recordings over the continental shelf northeast of Newfoundland show an accumulation of unconsolidated sediments ranging in thickness from 30 to 150 m, unconformably over-lying bedrock that dips gently eastward toward the continental slope. The distribution of these unconsolidated sediments indicates that the banks that compose the 'shelf-edge rise' are not primarily morainal material, but rather they are areas of positive relief on the bedrock surface. Anomalous strike-dip relationships associated with these bank areas suggest that they may also have structural significance. The underlying bedrock layers are truncated by the continental slope, and there is reversal in the dip of these layers from eastward to westward beneath the slope. The axial zone of the resulting fold apparently coincides very nearly with the axis of a large magnetic anomaly that extends along the continental margin in this region. A Tertiary to post-Tertiary age is suggested for the fold, as well as the structural disturbance associated with the topographic relief on the continental shelf. Within the continental rise an area of irregular bottom topography is considered to be due to the accumulation of large masses of sediment by slumping. Subbottom reflectors at depths beyond the continental rise show crumpling, which is assumed to be further evidence of mass-movement due to gravity. Superficially, the continental margin northeast of Newfoundland appears similar to parts of the continental margin to the south, on the flank of the Appalachian structural complex. Article in Journal/Newspaper Newfoundland Canadian Science Publishing (via Crossref) Canadian Journal of Earth Sciences 5 5 1187 1198 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Grant, A. C. Seismic-profiler investigation of the continental margin northeast of Newfoundland |
topic_facet |
General Earth and Planetary Sciences |
description |
Continuous seismic profiler recordings over the continental shelf northeast of Newfoundland show an accumulation of unconsolidated sediments ranging in thickness from 30 to 150 m, unconformably over-lying bedrock that dips gently eastward toward the continental slope. The distribution of these unconsolidated sediments indicates that the banks that compose the 'shelf-edge rise' are not primarily morainal material, but rather they are areas of positive relief on the bedrock surface. Anomalous strike-dip relationships associated with these bank areas suggest that they may also have structural significance. The underlying bedrock layers are truncated by the continental slope, and there is reversal in the dip of these layers from eastward to westward beneath the slope. The axial zone of the resulting fold apparently coincides very nearly with the axis of a large magnetic anomaly that extends along the continental margin in this region. A Tertiary to post-Tertiary age is suggested for the fold, as well as the structural disturbance associated with the topographic relief on the continental shelf. Within the continental rise an area of irregular bottom topography is considered to be due to the accumulation of large masses of sediment by slumping. Subbottom reflectors at depths beyond the continental rise show crumpling, which is assumed to be further evidence of mass-movement due to gravity. Superficially, the continental margin northeast of Newfoundland appears similar to parts of the continental margin to the south, on the flank of the Appalachian structural complex. |
format |
Article in Journal/Newspaper |
author |
Grant, A. C. |
author_facet |
Grant, A. C. |
author_sort |
Grant, A. C. |
title |
Seismic-profiler investigation of the continental margin northeast of Newfoundland |
title_short |
Seismic-profiler investigation of the continental margin northeast of Newfoundland |
title_full |
Seismic-profiler investigation of the continental margin northeast of Newfoundland |
title_fullStr |
Seismic-profiler investigation of the continental margin northeast of Newfoundland |
title_full_unstemmed |
Seismic-profiler investigation of the continental margin northeast of Newfoundland |
title_sort |
seismic-profiler investigation of the continental margin northeast of newfoundland |
publisher |
Canadian Science Publishing |
publishDate |
1968 |
url |
http://dx.doi.org/10.1139/e68-117 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-117 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 5, issue 5, page 1187-1198 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e68-117 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
5 |
container_issue |
5 |
container_start_page |
1187 |
op_container_end_page |
1198 |
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1785558780341125120 |