Early Silurian paleolatitude for central Newfoundland from paleomagnetism of the Wigwam Formation
Redbeds and minor volcanic rocks of the Early Silurian Wigwam Formation of the Botwood Group were sampled in the Exploits Subzone of the Dunnage Zone of central Newfoundland. At 18 sedimentary and 3 volcanic sites thermal demagnetization isolated a shallow northward (or southward) magnetization (D =...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1992
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e92-130 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-130 |
id |
crcansciencepubl:10.1139/e92-130 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e92-130 2023-12-17T10:44:44+01:00 Early Silurian paleolatitude for central Newfoundland from paleomagnetism of the Wigwam Formation Buchan, Kenneth L. Hodych, Joseph P. 1992 http://dx.doi.org/10.1139/e92-130 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-130 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 29, issue 8, page 1652-1661 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1992 crcansciencepubl https://doi.org/10.1139/e92-130 2023-11-19T13:38:39Z Redbeds and minor volcanic rocks of the Early Silurian Wigwam Formation of the Botwood Group were sampled in the Exploits Subzone of the Dunnage Zone of central Newfoundland. At 18 sedimentary and 3 volcanic sites thermal demagnetization isolated a shallow northward (or southward) magnetization (D = 356.0°, I = −16.8°; k = 12.9; α 95 = 9.2°; n = 21 site means) after correction for the tilt of bedding. A positive fold test demonstrates that this remanence predates regional Siluro–Devonian folding. A primary age for the remanence is indicated by positive conglomerate tests on volcanic clasts, and reversals correlated with sedimentary stratigraphy. Antiparallel remanence directions at sites of opposite polarity indicate that the primary remanence is not partially overprinted by a secondary component. The Exploits Subzone of the Dunnage Zone is interpreted to have been at low paleolatitudes (8.5°S ± 5°) during the Early Silurian. We reached a similar conclusion for the Notre Dame Subzone of the Dunnage Zone in a previous paleomagnetic study of Early Silurian redbeds and volcanic rocks of the King George IV Lake area. The low paleolatitudes obtained for the Wigwam and King George IV Lake rocks do not differ significantly and, hence, provide no evidence for a large ocean between the two subzones in the Early Silurian. However, the azimuthal orientation of the subzones at that time is still uncertain, and an ocean with its axis oriented in a north–south direction would not be detected by the paleomagnetic method. Article in Journal/Newspaper Newfoundland Canadian Science Publishing (via Crossref) Canadian Journal of Earth Sciences 29 8 1652 1661 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Buchan, Kenneth L. Hodych, Joseph P. Early Silurian paleolatitude for central Newfoundland from paleomagnetism of the Wigwam Formation |
topic_facet |
General Earth and Planetary Sciences |
description |
Redbeds and minor volcanic rocks of the Early Silurian Wigwam Formation of the Botwood Group were sampled in the Exploits Subzone of the Dunnage Zone of central Newfoundland. At 18 sedimentary and 3 volcanic sites thermal demagnetization isolated a shallow northward (or southward) magnetization (D = 356.0°, I = −16.8°; k = 12.9; α 95 = 9.2°; n = 21 site means) after correction for the tilt of bedding. A positive fold test demonstrates that this remanence predates regional Siluro–Devonian folding. A primary age for the remanence is indicated by positive conglomerate tests on volcanic clasts, and reversals correlated with sedimentary stratigraphy. Antiparallel remanence directions at sites of opposite polarity indicate that the primary remanence is not partially overprinted by a secondary component. The Exploits Subzone of the Dunnage Zone is interpreted to have been at low paleolatitudes (8.5°S ± 5°) during the Early Silurian. We reached a similar conclusion for the Notre Dame Subzone of the Dunnage Zone in a previous paleomagnetic study of Early Silurian redbeds and volcanic rocks of the King George IV Lake area. The low paleolatitudes obtained for the Wigwam and King George IV Lake rocks do not differ significantly and, hence, provide no evidence for a large ocean between the two subzones in the Early Silurian. However, the azimuthal orientation of the subzones at that time is still uncertain, and an ocean with its axis oriented in a north–south direction would not be detected by the paleomagnetic method. |
format |
Article in Journal/Newspaper |
author |
Buchan, Kenneth L. Hodych, Joseph P. |
author_facet |
Buchan, Kenneth L. Hodych, Joseph P. |
author_sort |
Buchan, Kenneth L. |
title |
Early Silurian paleolatitude for central Newfoundland from paleomagnetism of the Wigwam Formation |
title_short |
Early Silurian paleolatitude for central Newfoundland from paleomagnetism of the Wigwam Formation |
title_full |
Early Silurian paleolatitude for central Newfoundland from paleomagnetism of the Wigwam Formation |
title_fullStr |
Early Silurian paleolatitude for central Newfoundland from paleomagnetism of the Wigwam Formation |
title_full_unstemmed |
Early Silurian paleolatitude for central Newfoundland from paleomagnetism of the Wigwam Formation |
title_sort |
early silurian paleolatitude for central newfoundland from paleomagnetism of the wigwam formation |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/e92-130 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-130 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 29, issue 8, page 1652-1661 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e92-130 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
29 |
container_issue |
8 |
container_start_page |
1652 |
op_container_end_page |
1661 |
_version_ |
1785563509561491456 |