Seaward extension of the Canadian Appalachians
The subsurface geology of the Gulf of St. Lawrence and of the continental shelf off Nova Scotia and Newfoundland is interpreted primarily from the results of 37 seismic-refraction profiles. The Gulf of St. Lawrence is underlain by more than 7 km of Carboniferous sediments deposited in an east–west-t...
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1968
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Online Access: | http://dx.doi.org/10.1139/e68-037 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-037 |
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crcansciencepubl:10.1139/e68-037 2024-03-03T08:43:20+00:00 Seaward extension of the Canadian Appalachians Sheridan, Robert E. Drake, Charles L. 1968 http://dx.doi.org/10.1139/e68-037 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-037 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 5, issue 3, page 337-373 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1968 crcansciencepubl https://doi.org/10.1139/e68-037 2024-02-07T10:53:31Z The subsurface geology of the Gulf of St. Lawrence and of the continental shelf off Nova Scotia and Newfoundland is interpreted primarily from the results of 37 seismic-refraction profiles. The Gulf of St. Lawrence is underlain by more than 7 km of Carboniferous sediments deposited in an east–west-trending trough. Another important Carboniferous section about 5 km thick is observed northeast of Cape Breton Island in the Laurentian Channel. The Carboniferous trough north of Cape Breton Island swings irregularly east and south around a basement ridge and may hook into the deep east–west-trending Carboniferous trough extending out of Chedabucto Bay. The Gulf sedimentary basin is separated from the trough north of Cape Breton Island by a sharp rise in basement across Cabot Strait.Northeast of Newfoundland the pre-Upper Pennsylvanian basement plunges to deeper than 6 km in the area of the continental slope. A northeast–southwest-trending seaward-opening sediment-filled trough more than 5 km deep is revealed by the configuration of this basement northeast of the Avalon Peninsula.Seismic-refraction profiles across the Gulf of St. Lawrence between western Newfoundland and Quebec show no indication of rifting or the rotation of Newfoundland away from Quebec. Refraction profiles across the northeast rim of the Laurentian Channel indicate that the rim is erosional in origin and that the basement horizons pass continuously beneath.The seaward extension of the zone affected by the Acadian orogeny is characterized by highly metamorphosed basement with higher seismic velocities, 6.0–6.6 km/s, than the surrounding areas. Limited data northeast of Newfoundland indicate that these high velocities decrease gradually and suggest that the influence of the Acadian orogeny dies away about half way across the shelf.The seaward extension of the Taconic orogenic zone is characterized by an intermediate crustal layer, 6.6–7.6 km/s, at depths of 3–12 km. This intermediate layer continues intact all the way to the continental slope ... Article in Journal/Newspaper Breton Island Newfoundland Canadian Science Publishing Breton Island ENVELOPE(141.383,141.383,-66.800,-66.800) Cabot ENVELOPE(-54.600,-54.600,-63.383,-63.383) Canadian Journal of Earth Sciences 5 3 337 373 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Sheridan, Robert E. Drake, Charles L. Seaward extension of the Canadian Appalachians |
topic_facet |
General Earth and Planetary Sciences |
description |
The subsurface geology of the Gulf of St. Lawrence and of the continental shelf off Nova Scotia and Newfoundland is interpreted primarily from the results of 37 seismic-refraction profiles. The Gulf of St. Lawrence is underlain by more than 7 km of Carboniferous sediments deposited in an east–west-trending trough. Another important Carboniferous section about 5 km thick is observed northeast of Cape Breton Island in the Laurentian Channel. The Carboniferous trough north of Cape Breton Island swings irregularly east and south around a basement ridge and may hook into the deep east–west-trending Carboniferous trough extending out of Chedabucto Bay. The Gulf sedimentary basin is separated from the trough north of Cape Breton Island by a sharp rise in basement across Cabot Strait.Northeast of Newfoundland the pre-Upper Pennsylvanian basement plunges to deeper than 6 km in the area of the continental slope. A northeast–southwest-trending seaward-opening sediment-filled trough more than 5 km deep is revealed by the configuration of this basement northeast of the Avalon Peninsula.Seismic-refraction profiles across the Gulf of St. Lawrence between western Newfoundland and Quebec show no indication of rifting or the rotation of Newfoundland away from Quebec. Refraction profiles across the northeast rim of the Laurentian Channel indicate that the rim is erosional in origin and that the basement horizons pass continuously beneath.The seaward extension of the zone affected by the Acadian orogeny is characterized by highly metamorphosed basement with higher seismic velocities, 6.0–6.6 km/s, than the surrounding areas. Limited data northeast of Newfoundland indicate that these high velocities decrease gradually and suggest that the influence of the Acadian orogeny dies away about half way across the shelf.The seaward extension of the Taconic orogenic zone is characterized by an intermediate crustal layer, 6.6–7.6 km/s, at depths of 3–12 km. This intermediate layer continues intact all the way to the continental slope ... |
format |
Article in Journal/Newspaper |
author |
Sheridan, Robert E. Drake, Charles L. |
author_facet |
Sheridan, Robert E. Drake, Charles L. |
author_sort |
Sheridan, Robert E. |
title |
Seaward extension of the Canadian Appalachians |
title_short |
Seaward extension of the Canadian Appalachians |
title_full |
Seaward extension of the Canadian Appalachians |
title_fullStr |
Seaward extension of the Canadian Appalachians |
title_full_unstemmed |
Seaward extension of the Canadian Appalachians |
title_sort |
seaward extension of the canadian appalachians |
publisher |
Canadian Science Publishing |
publishDate |
1968 |
url |
http://dx.doi.org/10.1139/e68-037 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-037 |
long_lat |
ENVELOPE(141.383,141.383,-66.800,-66.800) ENVELOPE(-54.600,-54.600,-63.383,-63.383) |
geographic |
Breton Island Cabot |
geographic_facet |
Breton Island Cabot |
genre |
Breton Island Newfoundland |
genre_facet |
Breton Island Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 5, issue 3, page 337-373 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e68-037 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
5 |
container_issue |
3 |
container_start_page |
337 |
op_container_end_page |
373 |
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1792498769386799104 |