Crustal structure across the Southwest Newfoundland Transform Margin
A seismic-refraction survey providing deep crustal structure information of the continent–ocean boundary across the South-west Newfoundland Transform Margin was carried out using large air-gun sources and ocean-bottom seismometer receivers. Continental crust ~30 km thick beneath the southern Grand B...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1988
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e88-070 http://www.nrcresearchpress.com/doi/pdf/10.1139/e88-070 |
id |
crcansciencepubl:10.1139/e88-070 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e88-070 2024-09-09T19:53:31+00:00 Crustal structure across the Southwest Newfoundland Transform Margin Todd, B. J. Reid, I. Keen, C. E. 1988 http://dx.doi.org/10.1139/e88-070 http://www.nrcresearchpress.com/doi/pdf/10.1139/e88-070 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 25, issue 5, page 744-759 ISSN 0008-4077 1480-3313 journal-article 1988 crcansciencepubl https://doi.org/10.1139/e88-070 2024-07-25T04:10:07Z A seismic-refraction survey providing deep crustal structure information of the continent–ocean boundary across the South-west Newfoundland Transform Margin was carried out using large air-gun sources and ocean-bottom seismometer receivers. Continental crust ~30 km thick beneath the southern Grand Banks (P-wave velocity = 6.2–6.5 km/s) thins oceanward to a 25 km wide transition zone. In the transition zone, Paleozoic basement of the Grand Banks (5.5–5.7 km/s) is replaced by a basement of oceanic volcanics and synrift sediments (4.5–5.5 km/s). Seaward of the transition zone the crust is oceanic in character, with a velocity gradient from 4.7 to 6.5 km/s and a thickness of 7–8 km. Oceanic layer 3 is absent. No significant thickness of intermediate-velocity (>7 km/s) material is present at the continent–ocean transition, indicating that no under-plating of continental crust has taken place. The continent–ocean transition across the transform margin is much narrower than across rifted margins, supporting the theory that formation of the transform margin is by shearing of continental plates. Article in Journal/Newspaper Newfoundland Canadian Science Publishing Canadian Journal of Earth Sciences 25 5 744 759 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
A seismic-refraction survey providing deep crustal structure information of the continent–ocean boundary across the South-west Newfoundland Transform Margin was carried out using large air-gun sources and ocean-bottom seismometer receivers. Continental crust ~30 km thick beneath the southern Grand Banks (P-wave velocity = 6.2–6.5 km/s) thins oceanward to a 25 km wide transition zone. In the transition zone, Paleozoic basement of the Grand Banks (5.5–5.7 km/s) is replaced by a basement of oceanic volcanics and synrift sediments (4.5–5.5 km/s). Seaward of the transition zone the crust is oceanic in character, with a velocity gradient from 4.7 to 6.5 km/s and a thickness of 7–8 km. Oceanic layer 3 is absent. No significant thickness of intermediate-velocity (>7 km/s) material is present at the continent–ocean transition, indicating that no under-plating of continental crust has taken place. The continent–ocean transition across the transform margin is much narrower than across rifted margins, supporting the theory that formation of the transform margin is by shearing of continental plates. |
format |
Article in Journal/Newspaper |
author |
Todd, B. J. Reid, I. Keen, C. E. |
spellingShingle |
Todd, B. J. Reid, I. Keen, C. E. Crustal structure across the Southwest Newfoundland Transform Margin |
author_facet |
Todd, B. J. Reid, I. Keen, C. E. |
author_sort |
Todd, B. J. |
title |
Crustal structure across the Southwest Newfoundland Transform Margin |
title_short |
Crustal structure across the Southwest Newfoundland Transform Margin |
title_full |
Crustal structure across the Southwest Newfoundland Transform Margin |
title_fullStr |
Crustal structure across the Southwest Newfoundland Transform Margin |
title_full_unstemmed |
Crustal structure across the Southwest Newfoundland Transform Margin |
title_sort |
crustal structure across the southwest newfoundland transform margin |
publisher |
Canadian Science Publishing |
publishDate |
1988 |
url |
http://dx.doi.org/10.1139/e88-070 http://www.nrcresearchpress.com/doi/pdf/10.1139/e88-070 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 25, issue 5, page 744-759 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e88-070 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
25 |
container_issue |
5 |
container_start_page |
744 |
op_container_end_page |
759 |
_version_ |
1809922989681016832 |