Early and Middle Proterozoic evolution of Yukon, Canada
This paper provides a comprehensive synthesis of virtually all units and events of Early and Middle Proterozoic age in the Yukon, spanning ~1 Ga. Early and Middle Proterozoic time was dominated by a series of extensional-basin-forming events punctuated by orogenesis, magmatism, and hydrothermal acti...
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crcansciencepubl:10.1139/e04-075 2024-09-15T18:18:10+00:00 Early and Middle Proterozoic evolution of Yukon, Canada Thorkelson, Derek J Abbott, J Grant Mortensen, James K Creaser, Robert A Villeneuve, Michael E McNicoll, Vicki J Layer, Paul W 2005 http://dx.doi.org/10.1139/e04-075 http://www.nrcresearchpress.com/doi/pdf/10.1139/e04-075 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 42, issue 6, page 1045-1071 ISSN 0008-4077 1480-3313 journal-article 2005 crcansciencepubl https://doi.org/10.1139/e04-075 2024-09-05T04:11:14Z This paper provides a comprehensive synthesis of virtually all units and events of Early and Middle Proterozoic age in the Yukon, spanning ~1 Ga. Early and Middle Proterozoic time was dominated by a series of extensional-basin-forming events punctuated by orogenesis, magmatism, and hydrothermal activity. Basinal deposits include the Wernecke Supergroup (>1.71 Ga), Pinguicula Group (~1.38 Ga), and Mackenzie Mountains Supergroup (1.000.78 Ga). Igneous rocks include the Bonnet Plume River Intrusions (1.71 Ga), Slab volcanics (≥1.6 Ga), Hart River sills and volcanics (1.38 Ga), and Bear River (Mackenzie) dykes (1.27 Ga). A voluminous hydrothermal event generated the widespread Wernecke breccias at 1.60 Ga. The Racklan orogeny deformed the Wernecke Supergroup prior to emplacement of the Wernecke Breccia. The Corn Creek orogeny deformed Mackenzie Mountains Supergroup and older rocks prior to deposition of the Windermere Supergroup (<0.78 Ga). Long intervals with scanty rock records extended for as much as 300 Ma and appear to represent periods of crustal stability and subaerial conditions. By the time of Windermere rifting (<0.78 Ga), the supracrust of northwestern Laurentia was a mature, largely denuded orogenic belt with a composite sedimentarymetamorphicigneous character. New isotopic data include Nd depleted mantle model ages for the Wernecke Supergroup (2.282.69 Ga) and Wernecke Breccia (2.362.96 Ga), a UPb zircon age for a Hart River sill 1381.9 +5.3 -3.7 (Ma), detrital UPb zircon ages from the basal Pinguicula Group (18413078 Ma), detrital muscovite ages from the Mackenzie Mountains Supergroup (10372473 Ma), and muscovite 40 Ar/ 39 Ar cooling ages from the Wernecke Supergroup (788 ± 8 and 980 ± 4 Ma). Article in Journal/Newspaper Mackenzie mountains Yukon Canadian Science Publishing Canadian Journal of Earth Sciences 42 6 1045 1071 |
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Canadian Science Publishing |
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English |
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This paper provides a comprehensive synthesis of virtually all units and events of Early and Middle Proterozoic age in the Yukon, spanning ~1 Ga. Early and Middle Proterozoic time was dominated by a series of extensional-basin-forming events punctuated by orogenesis, magmatism, and hydrothermal activity. Basinal deposits include the Wernecke Supergroup (>1.71 Ga), Pinguicula Group (~1.38 Ga), and Mackenzie Mountains Supergroup (1.000.78 Ga). Igneous rocks include the Bonnet Plume River Intrusions (1.71 Ga), Slab volcanics (≥1.6 Ga), Hart River sills and volcanics (1.38 Ga), and Bear River (Mackenzie) dykes (1.27 Ga). A voluminous hydrothermal event generated the widespread Wernecke breccias at 1.60 Ga. The Racklan orogeny deformed the Wernecke Supergroup prior to emplacement of the Wernecke Breccia. The Corn Creek orogeny deformed Mackenzie Mountains Supergroup and older rocks prior to deposition of the Windermere Supergroup (<0.78 Ga). Long intervals with scanty rock records extended for as much as 300 Ma and appear to represent periods of crustal stability and subaerial conditions. By the time of Windermere rifting (<0.78 Ga), the supracrust of northwestern Laurentia was a mature, largely denuded orogenic belt with a composite sedimentarymetamorphicigneous character. New isotopic data include Nd depleted mantle model ages for the Wernecke Supergroup (2.282.69 Ga) and Wernecke Breccia (2.362.96 Ga), a UPb zircon age for a Hart River sill 1381.9 +5.3 -3.7 (Ma), detrital UPb zircon ages from the basal Pinguicula Group (18413078 Ma), detrital muscovite ages from the Mackenzie Mountains Supergroup (10372473 Ma), and muscovite 40 Ar/ 39 Ar cooling ages from the Wernecke Supergroup (788 ± 8 and 980 ± 4 Ma). |
format |
Article in Journal/Newspaper |
author |
Thorkelson, Derek J Abbott, J Grant Mortensen, James K Creaser, Robert A Villeneuve, Michael E McNicoll, Vicki J Layer, Paul W |
spellingShingle |
Thorkelson, Derek J Abbott, J Grant Mortensen, James K Creaser, Robert A Villeneuve, Michael E McNicoll, Vicki J Layer, Paul W Early and Middle Proterozoic evolution of Yukon, Canada |
author_facet |
Thorkelson, Derek J Abbott, J Grant Mortensen, James K Creaser, Robert A Villeneuve, Michael E McNicoll, Vicki J Layer, Paul W |
author_sort |
Thorkelson, Derek J |
title |
Early and Middle Proterozoic evolution of Yukon, Canada |
title_short |
Early and Middle Proterozoic evolution of Yukon, Canada |
title_full |
Early and Middle Proterozoic evolution of Yukon, Canada |
title_fullStr |
Early and Middle Proterozoic evolution of Yukon, Canada |
title_full_unstemmed |
Early and Middle Proterozoic evolution of Yukon, Canada |
title_sort |
early and middle proterozoic evolution of yukon, canada |
publisher |
Canadian Science Publishing |
publishDate |
2005 |
url |
http://dx.doi.org/10.1139/e04-075 http://www.nrcresearchpress.com/doi/pdf/10.1139/e04-075 |
genre |
Mackenzie mountains Yukon |
genre_facet |
Mackenzie mountains Yukon |
op_source |
Canadian Journal of Earth Sciences volume 42, issue 6, page 1045-1071 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e04-075 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
42 |
container_issue |
6 |
container_start_page |
1045 |
op_container_end_page |
1071 |
_version_ |
1810456288294862848 |