Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada
The Creignish Hills and North Mountain areas of southwestern Cape Breton Island consist mostly of Neoproterozoic rocks typical of the Ganderian Bras d’Or terrane. U-Pb ages presented here for detrital zircon in the Blues Brook Formation of the Creignish Hills confirm a depositional age no greater th...
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ftuninewbrunojs:oai:ojs.journals.lib.unb.ca:article/23792 2023-05-15T15:46:43+02:00 Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada White, Chris E. Barr, Sandra M. Davis, Donald W. Swanton, David S. Ketchum, John W.F. Reynolds, Peter H. 2016-02-04 text/html application/pdf https://journals.lib.unb.ca/index.php/ag/article/view/23792 eng eng Atlantic Geoscience Society https://journals.lib.unb.ca/index.php/ag/article/view/23792/28362 https://journals.lib.unb.ca/index.php/ag/article/view/23792/28356 https://journals.lib.unb.ca/index.php/ag/article/view/23792 Copyright (c) 2016 Atlantic Geology Atlantic Geoscience; Vol. 52 (2016); 037 - 059 2564-2987 geochronology U-Pb 40Ar/39Ar Igneous petrology Metamorphic petrology Granite Ganderia info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion research-article 2016 ftuninewbrunojs 2022-07-11T11:42:13Z The Creignish Hills and North Mountain areas of southwestern Cape Breton Island consist mostly of Neoproterozoic rocks typical of the Ganderian Bras d’Or terrane. U-Pb ages presented here for detrital zircon in the Blues Brook Formation of the Creignish Hills confirm a depositional age no greater than about 600 Ma. Although it is possible that some components of the formation are much older, similarities in rock types and field relations suggest that this is not the case. It is likely that the equivalent Malagawatch Formation of the North Mountain area, as well as high-grade metasedimentary rocks of the Melford Formation and Chuggin Road complex in the Creignish Hills and Lime Hill gneiss complex in the North Mountain area, represent the same or stratigraphically equivalent units as the Blues Brook Formation. The minimum ages of all of these units are constrained by cross-cutting syn- and post-tectonic plutons with ages mostly between 565 and 550 Ma, indicating that sediments were deposited, regionally metamorphosed, deformed, and intruded by plutons in less than 40–50 million years. The assemblage of pelitic, psammitic, and carbonate rocks indicates that a passive margin in a tropical climate was quickly changed to an active Andean-type continental margin in which voluminous calcalkaline dioritic to granitic plutons were emplaced. This sedimentary and tectonic history is characteristic of the Bras d’Or terrane and is shared by its likely correlative, the Brookville terrane in southern New Brunswick. Article in Journal/Newspaper Breton Island University of New Brunswick: Centre for Digital Scholarship Journals Breton Island ENVELOPE(141.383,141.383,-66.800,-66.800) Canada Atlantic Geology 52 037 |
institution |
Open Polar |
collection |
University of New Brunswick: Centre for Digital Scholarship Journals |
op_collection_id |
ftuninewbrunojs |
language |
English |
topic |
geochronology U-Pb 40Ar/39Ar Igneous petrology Metamorphic petrology Granite Ganderia |
spellingShingle |
geochronology U-Pb 40Ar/39Ar Igneous petrology Metamorphic petrology Granite Ganderia White, Chris E. Barr, Sandra M. Davis, Donald W. Swanton, David S. Ketchum, John W.F. Reynolds, Peter H. Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada |
topic_facet |
geochronology U-Pb 40Ar/39Ar Igneous petrology Metamorphic petrology Granite Ganderia |
description |
The Creignish Hills and North Mountain areas of southwestern Cape Breton Island consist mostly of Neoproterozoic rocks typical of the Ganderian Bras d’Or terrane. U-Pb ages presented here for detrital zircon in the Blues Brook Formation of the Creignish Hills confirm a depositional age no greater than about 600 Ma. Although it is possible that some components of the formation are much older, similarities in rock types and field relations suggest that this is not the case. It is likely that the equivalent Malagawatch Formation of the North Mountain area, as well as high-grade metasedimentary rocks of the Melford Formation and Chuggin Road complex in the Creignish Hills and Lime Hill gneiss complex in the North Mountain area, represent the same or stratigraphically equivalent units as the Blues Brook Formation. The minimum ages of all of these units are constrained by cross-cutting syn- and post-tectonic plutons with ages mostly between 565 and 550 Ma, indicating that sediments were deposited, regionally metamorphosed, deformed, and intruded by plutons in less than 40–50 million years. The assemblage of pelitic, psammitic, and carbonate rocks indicates that a passive margin in a tropical climate was quickly changed to an active Andean-type continental margin in which voluminous calcalkaline dioritic to granitic plutons were emplaced. This sedimentary and tectonic history is characteristic of the Bras d’Or terrane and is shared by its likely correlative, the Brookville terrane in southern New Brunswick. |
format |
Article in Journal/Newspaper |
author |
White, Chris E. Barr, Sandra M. Davis, Donald W. Swanton, David S. Ketchum, John W.F. Reynolds, Peter H. |
author_facet |
White, Chris E. Barr, Sandra M. Davis, Donald W. Swanton, David S. Ketchum, John W.F. Reynolds, Peter H. |
author_sort |
White, Chris E. |
title |
Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada |
title_short |
Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada |
title_full |
Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada |
title_fullStr |
Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada |
title_full_unstemmed |
Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada |
title_sort |
field relations, age, and tectonic setting of metamorphic and plutonic rocks in the creignish hills – north mountain area, southwestern cape breton island, nova scotia, canada |
publisher |
Atlantic Geoscience Society |
publishDate |
2016 |
url |
https://journals.lib.unb.ca/index.php/ag/article/view/23792 |
long_lat |
ENVELOPE(141.383,141.383,-66.800,-66.800) |
geographic |
Breton Island Canada |
geographic_facet |
Breton Island Canada |
genre |
Breton Island |
genre_facet |
Breton Island |
op_source |
Atlantic Geoscience; Vol. 52 (2016); 037 - 059 2564-2987 |
op_relation |
https://journals.lib.unb.ca/index.php/ag/article/view/23792/28362 https://journals.lib.unb.ca/index.php/ag/article/view/23792/28356 https://journals.lib.unb.ca/index.php/ag/article/view/23792 |
op_rights |
Copyright (c) 2016 Atlantic Geology |
container_title |
Atlantic Geology |
container_volume |
52 |
container_start_page |
037 |
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1766381418594697216 |