Archean mafic dyke swarms near the Cameron River and Beaulieu River volcanic belts and their implications for tectonic modelling of the Slave Province, Northwest Territories
Three dense swarms of Archean mafic dykes, which intrude the Beaulieu River and Cameron River volcanic belts and adjacent granitoid terranes of the Sleepy Dragon Complex and Meander Lake complex in the southern Slave Province, all contain clusters of multiple, parallel-sided "sheeted" dyke...
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1992
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crcansciencepubl:10.1139/e92-176 2024-06-23T07:55:43+00:00 Archean mafic dyke swarms near the Cameron River and Beaulieu River volcanic belts and their implications for tectonic modelling of the Slave Province, Northwest Territories Lambert, M. B. Ernst, R. E. Dudás, F. Ö. L. 1992 http://dx.doi.org/10.1139/e92-176 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-176 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 29, issue 10, page 2226-2248 ISSN 0008-4077 1480-3313 journal-article 1992 crcansciencepubl https://doi.org/10.1139/e92-176 2024-05-30T08:13:49Z Three dense swarms of Archean mafic dykes, which intrude the Beaulieu River and Cameron River volcanic belts and adjacent granitoid terranes of the Sleepy Dragon Complex and Meander Lake complex in the southern Slave Province, all contain clusters of multiple, parallel-sided "sheeted" dykes. None of the swarms can be convincingly modelled as being part of an ophiolite assemblage. The 3 km by 20+ km Step'nduck dyke complex, comprising about 350 mainly metabasaltic to meta-gabbroic dykes separated by screens of granitoid gneiss (>2750 Ma), represents profuse mafic magmatism in the Meander Lake complex. Dense dyke swarms within the Cameron River belt fed the lavas and are an integral part of the volcanic stratigraphy.All basaltic magmas represented by the volcanic belts, and the dyke sets, are predominantly mantle-derived, fractionated, tholeiites. Nd-isotope geochemistry indicates that they were all contaminated by Archean sialic material. Isotopic systematics are satisfied by mixing of depleted mantle and varying proportions of Sleepy Dragon-type crust.The dyke swarms in the Sleepy Dragon Complex and the Step'nduck swarm record extensional events in Archean continental crust. Possibly they are subsurface equivalents of now-eroded flood basalts that signalled the activity of mantle plumes during Archean times. This hypothesis is consistent with magmatic underplating of continental lithosphere and with extensive involvement of continental material. Article in Journal/Newspaper Northwest Territories Canadian Science Publishing Northwest Territories Beaulieu River ENVELOPE(-113.186,-113.186,62.050,62.050) Meander Lake ENVELOPE(-112.151,-112.151,62.584,62.584) Canadian Journal of Earth Sciences 29 10 2226 2248 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Three dense swarms of Archean mafic dykes, which intrude the Beaulieu River and Cameron River volcanic belts and adjacent granitoid terranes of the Sleepy Dragon Complex and Meander Lake complex in the southern Slave Province, all contain clusters of multiple, parallel-sided "sheeted" dykes. None of the swarms can be convincingly modelled as being part of an ophiolite assemblage. The 3 km by 20+ km Step'nduck dyke complex, comprising about 350 mainly metabasaltic to meta-gabbroic dykes separated by screens of granitoid gneiss (>2750 Ma), represents profuse mafic magmatism in the Meander Lake complex. Dense dyke swarms within the Cameron River belt fed the lavas and are an integral part of the volcanic stratigraphy.All basaltic magmas represented by the volcanic belts, and the dyke sets, are predominantly mantle-derived, fractionated, tholeiites. Nd-isotope geochemistry indicates that they were all contaminated by Archean sialic material. Isotopic systematics are satisfied by mixing of depleted mantle and varying proportions of Sleepy Dragon-type crust.The dyke swarms in the Sleepy Dragon Complex and the Step'nduck swarm record extensional events in Archean continental crust. Possibly they are subsurface equivalents of now-eroded flood basalts that signalled the activity of mantle plumes during Archean times. This hypothesis is consistent with magmatic underplating of continental lithosphere and with extensive involvement of continental material. |
format |
Article in Journal/Newspaper |
author |
Lambert, M. B. Ernst, R. E. Dudás, F. Ö. L. |
spellingShingle |
Lambert, M. B. Ernst, R. E. Dudás, F. Ö. L. Archean mafic dyke swarms near the Cameron River and Beaulieu River volcanic belts and their implications for tectonic modelling of the Slave Province, Northwest Territories |
author_facet |
Lambert, M. B. Ernst, R. E. Dudás, F. Ö. L. |
author_sort |
Lambert, M. B. |
title |
Archean mafic dyke swarms near the Cameron River and Beaulieu River volcanic belts and their implications for tectonic modelling of the Slave Province, Northwest Territories |
title_short |
Archean mafic dyke swarms near the Cameron River and Beaulieu River volcanic belts and their implications for tectonic modelling of the Slave Province, Northwest Territories |
title_full |
Archean mafic dyke swarms near the Cameron River and Beaulieu River volcanic belts and their implications for tectonic modelling of the Slave Province, Northwest Territories |
title_fullStr |
Archean mafic dyke swarms near the Cameron River and Beaulieu River volcanic belts and their implications for tectonic modelling of the Slave Province, Northwest Territories |
title_full_unstemmed |
Archean mafic dyke swarms near the Cameron River and Beaulieu River volcanic belts and their implications for tectonic modelling of the Slave Province, Northwest Territories |
title_sort |
archean mafic dyke swarms near the cameron river and beaulieu river volcanic belts and their implications for tectonic modelling of the slave province, northwest territories |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/e92-176 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-176 |
long_lat |
ENVELOPE(-113.186,-113.186,62.050,62.050) ENVELOPE(-112.151,-112.151,62.584,62.584) |
geographic |
Northwest Territories Beaulieu River Meander Lake |
geographic_facet |
Northwest Territories Beaulieu River Meander Lake |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_source |
Canadian Journal of Earth Sciences volume 29, issue 10, page 2226-2248 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e92-176 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
29 |
container_issue |
10 |
container_start_page |
2226 |
op_container_end_page |
2248 |
_version_ |
1802648386430566400 |