Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada
Paleomagnetic results are reported from the Devonian St. Lawrence granite and the fluorite veins within the granite or its related porphyry dikes. Paleomagnetic analysis of 359 specimens from 29 sites shows that there is no statistically significant difference at 95% confidence between the site mean...
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2008
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crcansciencepubl:10.1139/e08-045 2023-12-17T10:44:57+01:00 Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada Kawasaki, K. Symons, D. T.A. Cook, F. 2008 http://dx.doi.org/10.1139/e08-045 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-045 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-045 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 45, issue 9, page 969-980 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2008 crcansciencepubl https://doi.org/10.1139/e08-045 2023-11-19T13:38:22Z Paleomagnetic results are reported from the Devonian St. Lawrence granite and the fluorite veins within the granite or its related porphyry dikes. Paleomagnetic analysis of 359 specimens from 29 sites shows that there is no statistically significant difference at 95% confidence between the site mean characteristic remanent magnetization (ChRM) directions carried by pyrrhotite and (or) magnetite of the granite and fluorite veins. No post-granite metamorphic event is known in the area. Thus, these concordant directions indicate that the granite and fluorite veins are coeval and retain a primary remanence. However, the mean ChRM direction of 25 vein and granite sites yields an Early Pennsylvanian paleopole of ∼316 Ma on the North American apparent polar wander path at 35.5°N, 129.2°E (A 95 = 3.4°) that is younger than the 374 ± 2 Ma Devonian U–Pb zircon age for the granite. Two intersecting vertical vein sets indicate that the St. Lawrence granite has not been tilted since emplacement of the fluorite veins. Therefore, the difference between the measured and expected paleopoles is interpreted to result from a postemplacement counterclockwise rotation of ∼17° of the St. Lawrence granite region about a vertical axis. Analysis of Carboniferous paleopoles in the northern Appalachian orogen indicates the rotation at the St. Lawrence area is Late Devonian during the Acadian orogeny. Article in Journal/Newspaper Newfoundland Canadian Science Publishing (via Crossref) Canada Canadian Journal of Earth Sciences 45 9 969 980 |
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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 Kawasaki, K. Symons, D. T.A. Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
Paleomagnetic results are reported from the Devonian St. Lawrence granite and the fluorite veins within the granite or its related porphyry dikes. Paleomagnetic analysis of 359 specimens from 29 sites shows that there is no statistically significant difference at 95% confidence between the site mean characteristic remanent magnetization (ChRM) directions carried by pyrrhotite and (or) magnetite of the granite and fluorite veins. No post-granite metamorphic event is known in the area. Thus, these concordant directions indicate that the granite and fluorite veins are coeval and retain a primary remanence. However, the mean ChRM direction of 25 vein and granite sites yields an Early Pennsylvanian paleopole of ∼316 Ma on the North American apparent polar wander path at 35.5°N, 129.2°E (A 95 = 3.4°) that is younger than the 374 ± 2 Ma Devonian U–Pb zircon age for the granite. Two intersecting vertical vein sets indicate that the St. Lawrence granite has not been tilted since emplacement of the fluorite veins. Therefore, the difference between the measured and expected paleopoles is interpreted to result from a postemplacement counterclockwise rotation of ∼17° of the St. Lawrence granite region about a vertical axis. Analysis of Carboniferous paleopoles in the northern Appalachian orogen indicates the rotation at the St. Lawrence area is Late Devonian during the Acadian orogeny. |
author2 |
Cook, F. |
format |
Article in Journal/Newspaper |
author |
Kawasaki, K. Symons, D. T.A. |
author_facet |
Kawasaki, K. Symons, D. T.A. |
author_sort |
Kawasaki, K. |
title |
Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada |
title_short |
Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada |
title_full |
Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada |
title_fullStr |
Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada |
title_full_unstemmed |
Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada |
title_sort |
paleomagnetism of fluorite veins in the devonian st. lawrence granite, newfoundland, canada |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/e08-045 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-045 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-045 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 45, issue 9, page 969-980 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e08-045 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
45 |
container_issue |
9 |
container_start_page |
969 |
op_container_end_page |
980 |
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1785564601511837696 |