Rubidium–strontium ages from the Oxford Lake – Knee Lake greenstone belt, northern Manitoba
Rb–Sr whole-rock ages have been determined for rocks from the Oxford Lake – Knee Lake – Gods Lake greenstone belt, in the Superior Province of northeastern Manitoba.The age of the Magill Lake Pluton is 2455 ± 35 Ma (λ 87 Rb = 1.42 × 10 −11 yr −1 ), with an initial 87 Sr/ 86 Sr ratio of 0.7078 ± 0.00...
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Canadian Science Publishing
1980
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crcansciencepubl:10.1139/e80-055 2024-09-15T18:10:47+00:00 Rubidium–strontium ages from the Oxford Lake – Knee Lake greenstone belt, northern Manitoba Clark, G. S. Cheung, S.-P. 1980 http://dx.doi.org/10.1139/e80-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/e80-055 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 17, issue 5, page 560-568 ISSN 0008-4077 1480-3313 journal-article 1980 crcansciencepubl https://doi.org/10.1139/e80-055 2024-07-25T04:10:06Z Rb–Sr whole-rock ages have been determined for rocks from the Oxford Lake – Knee Lake – Gods Lake greenstone belt, in the Superior Province of northeastern Manitoba.The age of the Magill Lake Pluton is 2455 ± 35 Ma (λ 87 Rb = 1.42 × 10 −11 yr −1 ), with an initial 87 Sr/ 86 Sr ratio of 0.7078 ± 0.0043. This granitic stock intrudes the Oxford Lake Group, so it is post-tectonic and probably related to the second, weaker stage of metamorphism.The age of the Bayly Lake Pluton is 2424 ± 74 Ma, with an initial 87 Sr/ 86 Sr ratio of 0.7029 ± 0.0001. This granodioritic batholith complex does not intrude the Oxford Lake Group. It is syn-tectonic and metamorphosed.The age of volcanic rocks of the Hayes River Group, from Goose Lake (30 km south of Gods Lake Narrows), is 2680 ± 125 Ma, with an initial 87 Sr/ 86 Sr ratio of 0.7014 ± 0.0009.The age for the Magill Lake and Bayly Lake Plutons can be interpreted as the minimum ages of granitic intrusion in the area.The age for the Hayes River Group volcanic rocks is consistent with Rb–Sr ages of volcanic rocks from other Archean greenstone belts within the northwestern Superior Province. Article in Journal/Newspaper Hayes River Canadian Science Publishing Canadian Journal of Earth Sciences 17 5 560 568 |
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Canadian Science Publishing |
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English |
description |
Rb–Sr whole-rock ages have been determined for rocks from the Oxford Lake – Knee Lake – Gods Lake greenstone belt, in the Superior Province of northeastern Manitoba.The age of the Magill Lake Pluton is 2455 ± 35 Ma (λ 87 Rb = 1.42 × 10 −11 yr −1 ), with an initial 87 Sr/ 86 Sr ratio of 0.7078 ± 0.0043. This granitic stock intrudes the Oxford Lake Group, so it is post-tectonic and probably related to the second, weaker stage of metamorphism.The age of the Bayly Lake Pluton is 2424 ± 74 Ma, with an initial 87 Sr/ 86 Sr ratio of 0.7029 ± 0.0001. This granodioritic batholith complex does not intrude the Oxford Lake Group. It is syn-tectonic and metamorphosed.The age of volcanic rocks of the Hayes River Group, from Goose Lake (30 km south of Gods Lake Narrows), is 2680 ± 125 Ma, with an initial 87 Sr/ 86 Sr ratio of 0.7014 ± 0.0009.The age for the Magill Lake and Bayly Lake Plutons can be interpreted as the minimum ages of granitic intrusion in the area.The age for the Hayes River Group volcanic rocks is consistent with Rb–Sr ages of volcanic rocks from other Archean greenstone belts within the northwestern Superior Province. |
format |
Article in Journal/Newspaper |
author |
Clark, G. S. Cheung, S.-P. |
spellingShingle |
Clark, G. S. Cheung, S.-P. Rubidium–strontium ages from the Oxford Lake – Knee Lake greenstone belt, northern Manitoba |
author_facet |
Clark, G. S. Cheung, S.-P. |
author_sort |
Clark, G. S. |
title |
Rubidium–strontium ages from the Oxford Lake – Knee Lake greenstone belt, northern Manitoba |
title_short |
Rubidium–strontium ages from the Oxford Lake – Knee Lake greenstone belt, northern Manitoba |
title_full |
Rubidium–strontium ages from the Oxford Lake – Knee Lake greenstone belt, northern Manitoba |
title_fullStr |
Rubidium–strontium ages from the Oxford Lake – Knee Lake greenstone belt, northern Manitoba |
title_full_unstemmed |
Rubidium–strontium ages from the Oxford Lake – Knee Lake greenstone belt, northern Manitoba |
title_sort |
rubidium–strontium ages from the oxford lake – knee lake greenstone belt, northern manitoba |
publisher |
Canadian Science Publishing |
publishDate |
1980 |
url |
http://dx.doi.org/10.1139/e80-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/e80-055 |
genre |
Hayes River |
genre_facet |
Hayes River |
op_source |
Canadian Journal of Earth Sciences volume 17, issue 5, page 560-568 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e80-055 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
17 |
container_issue |
5 |
container_start_page |
560 |
op_container_end_page |
568 |
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1810448366555889664 |