Nd isotopic evidence for crustal recycling in the ca. 2.0 Ga subsurface of western Canada
Sm–Nd isotopic data are presented for 23 drill-core samples from five aeromagnetically and geochronologically (U–Pb zircon) distinct domains of the Precambrian basement of northern Alberta. The domains in question are the Taltson (1.96–1.94 Ga), Buffalo Head (2.32–1.99 Ga), Chinchaga (2.19–2.09 Ga),...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1991
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Online Access: | http://dx.doi.org/10.1139/e91-104 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-104 |
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crcansciencepubl:10.1139/e91-104 2024-06-23T07:53:07+00:00 Nd isotopic evidence for crustal recycling in the ca. 2.0 Ga subsurface of western Canada Thériault, R. J. Ross, G. M. 1991 http://dx.doi.org/10.1139/e91-104 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-104 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 28, issue 8, page 1140-1147 ISSN 0008-4077 1480-3313 journal-article 1991 crcansciencepubl https://doi.org/10.1139/e91-104 2024-06-13T04:10:53Z Sm–Nd isotopic data are presented for 23 drill-core samples from five aeromagnetically and geochronologically (U–Pb zircon) distinct domains of the Precambrian basement of northern Alberta. The domains in question are the Taltson (1.96–1.94 Ga), Buffalo Head (2.32–1.99 Ga), Chinchaga (2.19–2.09 Ga), Ksituan (1.99–1.90 Ga), and Nova (2.81 Ga). These domains are truncated to the north and south by the Great Slave Lake shear zone and the Snowbird tectonic zone, respectively.Initial ε Nd values are −5.0 to −9.7 for the Taltson, +0.2 to −6.3 for the Buffalo Head, +0.6 to −1.8 for the Chinchaga, −1.8 to −2.1 for the Ksituan and +5.6 for the Nova. Crustal residence model ages fall in the 2.5–2.8 Ga range. The Nd isotopic signatures may be viewed in terms of mixing a minimum of 10% Archean continental crust with a depleted-mantle component. Speculations on the tectonic history of the basement domains in question involve the assembly of Archean crustal nuclei to form the Buffalo Head – Chinchaga composite domain. Arc magmatism resulting from plate subduction to the east and west of the Buffalo Head – Chinchaga composite domain would have generated the Taltson and Ksituan domains. The Nd isotopic data suggest that the basement of northern Alberta consists of crust of late Archean crustal residence age which has been extensively remobilized in the Early Proterozoic. Article in Journal/Newspaper Great Slave Lake Slave Lake Canadian Science Publishing Buffalo Head ENVELOPE(173.225,173.225,52.908,52.908) Canada Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Ksituan ENVELOPE(-119.019,-119.019,55.900,55.900) Canadian Journal of Earth Sciences 28 8 1140 1147 |
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Open Polar |
collection |
Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Sm–Nd isotopic data are presented for 23 drill-core samples from five aeromagnetically and geochronologically (U–Pb zircon) distinct domains of the Precambrian basement of northern Alberta. The domains in question are the Taltson (1.96–1.94 Ga), Buffalo Head (2.32–1.99 Ga), Chinchaga (2.19–2.09 Ga), Ksituan (1.99–1.90 Ga), and Nova (2.81 Ga). These domains are truncated to the north and south by the Great Slave Lake shear zone and the Snowbird tectonic zone, respectively.Initial ε Nd values are −5.0 to −9.7 for the Taltson, +0.2 to −6.3 for the Buffalo Head, +0.6 to −1.8 for the Chinchaga, −1.8 to −2.1 for the Ksituan and +5.6 for the Nova. Crustal residence model ages fall in the 2.5–2.8 Ga range. The Nd isotopic signatures may be viewed in terms of mixing a minimum of 10% Archean continental crust with a depleted-mantle component. Speculations on the tectonic history of the basement domains in question involve the assembly of Archean crustal nuclei to form the Buffalo Head – Chinchaga composite domain. Arc magmatism resulting from plate subduction to the east and west of the Buffalo Head – Chinchaga composite domain would have generated the Taltson and Ksituan domains. The Nd isotopic data suggest that the basement of northern Alberta consists of crust of late Archean crustal residence age which has been extensively remobilized in the Early Proterozoic. |
format |
Article in Journal/Newspaper |
author |
Thériault, R. J. Ross, G. M. |
spellingShingle |
Thériault, R. J. Ross, G. M. Nd isotopic evidence for crustal recycling in the ca. 2.0 Ga subsurface of western Canada |
author_facet |
Thériault, R. J. Ross, G. M. |
author_sort |
Thériault, R. J. |
title |
Nd isotopic evidence for crustal recycling in the ca. 2.0 Ga subsurface of western Canada |
title_short |
Nd isotopic evidence for crustal recycling in the ca. 2.0 Ga subsurface of western Canada |
title_full |
Nd isotopic evidence for crustal recycling in the ca. 2.0 Ga subsurface of western Canada |
title_fullStr |
Nd isotopic evidence for crustal recycling in the ca. 2.0 Ga subsurface of western Canada |
title_full_unstemmed |
Nd isotopic evidence for crustal recycling in the ca. 2.0 Ga subsurface of western Canada |
title_sort |
nd isotopic evidence for crustal recycling in the ca. 2.0 ga subsurface of western canada |
publisher |
Canadian Science Publishing |
publishDate |
1991 |
url |
http://dx.doi.org/10.1139/e91-104 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-104 |
long_lat |
ENVELOPE(173.225,173.225,52.908,52.908) ENVELOPE(-114.001,-114.001,61.500,61.500) ENVELOPE(-119.019,-119.019,55.900,55.900) |
geographic |
Buffalo Head Canada Great Slave Lake Ksituan |
geographic_facet |
Buffalo Head Canada Great Slave Lake Ksituan |
genre |
Great Slave Lake Slave Lake |
genre_facet |
Great Slave Lake Slave Lake |
op_source |
Canadian Journal of Earth Sciences volume 28, issue 8, page 1140-1147 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e91-104 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
28 |
container_issue |
8 |
container_start_page |
1140 |
op_container_end_page |
1147 |
_version_ |
1802644602024361984 |