Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia
Rubidium–strontium whole-rock and mineral ages of granitic rocks from fourteen localities on Cape Breton Island have been measured. The ages cluster about a mean value of about 560 m.y. and indicate that most of the granitic rocks on the island have primary ages that are close to the Cambrian–Precam...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1972
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Online Access: | http://dx.doi.org/10.1139/e72-093 http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-093 |
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crcansciencepubl:10.1139/e72-093 2024-09-15T18:00:24+00:00 Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia Cormier, Randall F. 1972 http://dx.doi.org/10.1139/e72-093 http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-093 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 9, issue 9, page 1074-1086 ISSN 0008-4077 1480-3313 journal-article 1972 crcansciencepubl https://doi.org/10.1139/e72-093 2024-07-25T04:10:03Z Rubidium–strontium whole-rock and mineral ages of granitic rocks from fourteen localities on Cape Breton Island have been measured. The ages cluster about a mean value of about 560 m.y. and indicate that most of the granitic rocks on the island have primary ages that are close to the Cambrian–Precambrian (Hadrynian) boundary. Some of the granitic rocks, particularly in the northern highlands, may have considerably younger, Siluro–Devonian (Acadian?), primary ages. Evidence is presented suggesting that simple biotite ages are not always reliable for the measurement of primary ages of granitic rocks. It. is suggested that, the granitic rocks having primary ages close to the Cambrian-Precambrian boundary be referred to a hitherto generally unrecognized episode of granitic intrusion, the Bretonian. Article in Journal/Newspaper Breton Island Canadian Science Publishing Canadian Journal of Earth Sciences 9 9 1074 1086 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Rubidium–strontium whole-rock and mineral ages of granitic rocks from fourteen localities on Cape Breton Island have been measured. The ages cluster about a mean value of about 560 m.y. and indicate that most of the granitic rocks on the island have primary ages that are close to the Cambrian–Precambrian (Hadrynian) boundary. Some of the granitic rocks, particularly in the northern highlands, may have considerably younger, Siluro–Devonian (Acadian?), primary ages. Evidence is presented suggesting that simple biotite ages are not always reliable for the measurement of primary ages of granitic rocks. It. is suggested that, the granitic rocks having primary ages close to the Cambrian-Precambrian boundary be referred to a hitherto generally unrecognized episode of granitic intrusion, the Bretonian. |
format |
Article in Journal/Newspaper |
author |
Cormier, Randall F. |
spellingShingle |
Cormier, Randall F. Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia |
author_facet |
Cormier, Randall F. |
author_sort |
Cormier, Randall F. |
title |
Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia |
title_short |
Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia |
title_full |
Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia |
title_fullStr |
Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia |
title_full_unstemmed |
Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia |
title_sort |
radiometric ages of granitic rocks, cape breton island, nova scotia |
publisher |
Canadian Science Publishing |
publishDate |
1972 |
url |
http://dx.doi.org/10.1139/e72-093 http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-093 |
genre |
Breton Island |
genre_facet |
Breton Island |
op_source |
Canadian Journal of Earth Sciences volume 9, issue 9, page 1074-1086 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e72-093 |
container_title |
Canadian Journal of Earth Sciences |
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9 |
container_issue |
9 |
container_start_page |
1074 |
op_container_end_page |
1086 |
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1810437565704044544 |