The Dog Bay Line: a major Silurian tectonic boundary in northeast Newfoundland
The Dog Bay Line separates different Silurian rock groups in northeast Newfoundland. West of the line, terrestrial volcanic rocks and sandstones (Botwood Group) overlie marine greywackes and conglomerates (Badger Group). East of the line, red sandstones overlie shallow marine shales and limestones (...
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1993
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crcansciencepubl:10.1139/e93-215 2024-03-03T08:46:41+00:00 The Dog Bay Line: a major Silurian tectonic boundary in northeast Newfoundland Williams, H. Currie, K. L. Piasecki, M. A. J. 1993 http://dx.doi.org/10.1139/e93-215 http://www.nrcresearchpress.com/doi/pdf/10.1139/e93-215 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 30, issue 12, page 2481-2494 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1993 crcansciencepubl https://doi.org/10.1139/e93-215 2024-02-07T10:53:41Z The Dog Bay Line separates different Silurian rock groups in northeast Newfoundland. West of the line, terrestrial volcanic rocks and sandstones (Botwood Group) overlie marine greywackes and conglomerates (Badger Group). East of the line, red sandstones overlie shallow marine shales and limestones (Indian Islands Group). Throughout Dog Bay, the line is marked by a disrupted zone of dark grey to black shales, volcanic rocks, and gabbros. Pervasive dextral, transpressive ductile deformation followed by successively more brittle extension with renewed dextral movements mark the northwest side of the line on the coast.The Dog Bay Line is traceable for 100 km and it is open-ended. Dextral offset is deduced to be many tens of kilometres. The line trends northeast, parallel to outcrop belts, and both the line and outcrop belts are curved eastward at the coast. The Mount Peyton Batholith, dated at 420 ± 8 Ma, apparently cuts the line.The Dog Bay Line occurs within the Dunnage Zone whose Cambrian–Ordovician rocks represent vestiges of the Iapetus Ocean. Northwest of the line, the Silurian rocks were deposited on Ordovician rocks already accreted to Laurentia. Southeast of the line, the Silurian rocks were deposited on Ordovician rocks already amalgamated with the continental Gander Zone. Timing of major movement and a Silurian marine to terrestrial depositional change recorded on both sides of the line agree within error with isotopic ages for the onset of plutonism, regional deformation, and metamorphism in central Newfoundland. The Dog Bay Line may mark the terminal Iapetus Ocean. Article in Journal/Newspaper Newfoundland Canadian Science Publishing Indian Canadian Journal of Earth Sciences 30 12 2481 2494 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Williams, H. Currie, K. L. Piasecki, M. A. J. The Dog Bay Line: a major Silurian tectonic boundary in northeast Newfoundland |
topic_facet |
General Earth and Planetary Sciences |
description |
The Dog Bay Line separates different Silurian rock groups in northeast Newfoundland. West of the line, terrestrial volcanic rocks and sandstones (Botwood Group) overlie marine greywackes and conglomerates (Badger Group). East of the line, red sandstones overlie shallow marine shales and limestones (Indian Islands Group). Throughout Dog Bay, the line is marked by a disrupted zone of dark grey to black shales, volcanic rocks, and gabbros. Pervasive dextral, transpressive ductile deformation followed by successively more brittle extension with renewed dextral movements mark the northwest side of the line on the coast.The Dog Bay Line is traceable for 100 km and it is open-ended. Dextral offset is deduced to be many tens of kilometres. The line trends northeast, parallel to outcrop belts, and both the line and outcrop belts are curved eastward at the coast. The Mount Peyton Batholith, dated at 420 ± 8 Ma, apparently cuts the line.The Dog Bay Line occurs within the Dunnage Zone whose Cambrian–Ordovician rocks represent vestiges of the Iapetus Ocean. Northwest of the line, the Silurian rocks were deposited on Ordovician rocks already accreted to Laurentia. Southeast of the line, the Silurian rocks were deposited on Ordovician rocks already amalgamated with the continental Gander Zone. Timing of major movement and a Silurian marine to terrestrial depositional change recorded on both sides of the line agree within error with isotopic ages for the onset of plutonism, regional deformation, and metamorphism in central Newfoundland. The Dog Bay Line may mark the terminal Iapetus Ocean. |
format |
Article in Journal/Newspaper |
author |
Williams, H. Currie, K. L. Piasecki, M. A. J. |
author_facet |
Williams, H. Currie, K. L. Piasecki, M. A. J. |
author_sort |
Williams, H. |
title |
The Dog Bay Line: a major Silurian tectonic boundary in northeast Newfoundland |
title_short |
The Dog Bay Line: a major Silurian tectonic boundary in northeast Newfoundland |
title_full |
The Dog Bay Line: a major Silurian tectonic boundary in northeast Newfoundland |
title_fullStr |
The Dog Bay Line: a major Silurian tectonic boundary in northeast Newfoundland |
title_full_unstemmed |
The Dog Bay Line: a major Silurian tectonic boundary in northeast Newfoundland |
title_sort |
dog bay line: a major silurian tectonic boundary in northeast newfoundland |
publisher |
Canadian Science Publishing |
publishDate |
1993 |
url |
http://dx.doi.org/10.1139/e93-215 http://www.nrcresearchpress.com/doi/pdf/10.1139/e93-215 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 30, issue 12, page 2481-2494 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e93-215 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
30 |
container_issue |
12 |
container_start_page |
2481 |
op_container_end_page |
2494 |
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