Petrology and lithogeochemistry of Paleozoic alkalic magmatism in the Selwyn Basin, Yukon, Canada

Alkalic magmatism occurred in the Selwyn Basin, Yukon, Canada throughout the Paleozoic, concurrent with extension during passive margin sedimentation. To examine magmatism associated with this extension, geochemical data were obtained from several locations in the Selwyn Basin (MacMillan Pass, Anvil...

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Published in:Canadian Journal of Earth Sciences
Main Authors: Scanlan, Emma J., Leybourne, Matthew I., Layton-Matthews, Daniel, Van Wagoner, Nancy, Paradis, Suzanne, Piercey, Steve, Crowley, James L.
Other Authors: Natural Resources Canada, Society of Economic Geologists Foundation, Arthur B. McDonald Canadian Astroparticle Physics Research Institute
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 2024
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Online Access:http://dx.doi.org/10.1139/cjes-2023-0081
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spelling crcansciencepubl:10.1139/cjes-2023-0081 2024-05-19T07:43:22+00:00 Petrology and lithogeochemistry of Paleozoic alkalic magmatism in the Selwyn Basin, Yukon, Canada Scanlan, Emma J. Leybourne, Matthew I. Layton-Matthews, Daniel Van Wagoner, Nancy Paradis, Suzanne Piercey, Steve Crowley, James L. Natural Resources Canada Society of Economic Geologists Foundation Arthur B. McDonald Canadian Astroparticle Physics Research Institute 2024 http://dx.doi.org/10.1139/cjes-2023-0081 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2023-0081 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2023-0081 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 61, issue 5, page 597-619 ISSN 0008-4077 1480-3313 journal-article 2024 crcansciencepubl https://doi.org/10.1139/cjes-2023-0081 2024-05-02T06:51:27Z Alkalic magmatism occurred in the Selwyn Basin, Yukon, Canada throughout the Paleozoic, concurrent with extension during passive margin sedimentation. To examine magmatism associated with this extension, geochemical data were obtained from several locations in the Selwyn Basin (MacMillan Pass, Anvil District, Keno Hill, and the Misty Creek Embayment). Volcanic rocks from the Anvil District and the Misty Creek Embayment are dominated by alkalic basalts with light rare earth element (LREE)-enriched geochemical signatures, whereas metavolcanic and dike samples from Keno Hill comprise subalkaline basalts with enriched mid-ocean ridge basalt (E-MORB) signatures. The Early Ordovician Menzie Creek volcanic rocks of the Anvil District display trace element geochemical signatures intermediate between ocean island basalt (OIB) and E-MORB, whereas the Middle–Late Ordovician volcanic rocks from the Misty Creek Embayment have OIB signatures. Differences in the trace element geochemistry of the sample suites are attributed to the degree of partial melting. The Menzie Creek volcanic rocks formed from large volume melts of enriched mantle that diluted incompatible element signatures in the Early Ordovician. Late Ordovician magmatism produced the Misty Creek Embayment samples, where restricted melt volumes of an enriched mantle source resulted in the most enriched samples geochemically. The Keno Hill samples represent the shallowest melting of the analysed samples and may have resulted from melting of heterogenous subcontinental lithospheric mantle. Magmatic zircons from a Keno Hill metavolcanic sample analysed by chemical abrasion thermal ionization mass spectrometry resulted in a primary deposition age of c. 296 ± 0.36 Ma (Early Permian), during a period with little magmatism in the Selwyn Basin and representing a previously unknown unit in the area. Article in Journal/Newspaper Keno Hill Ocean Island Yukon Canadian Science Publishing Canadian Journal of Earth Sciences
institution Open Polar
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op_collection_id crcansciencepubl
language English
description Alkalic magmatism occurred in the Selwyn Basin, Yukon, Canada throughout the Paleozoic, concurrent with extension during passive margin sedimentation. To examine magmatism associated with this extension, geochemical data were obtained from several locations in the Selwyn Basin (MacMillan Pass, Anvil District, Keno Hill, and the Misty Creek Embayment). Volcanic rocks from the Anvil District and the Misty Creek Embayment are dominated by alkalic basalts with light rare earth element (LREE)-enriched geochemical signatures, whereas metavolcanic and dike samples from Keno Hill comprise subalkaline basalts with enriched mid-ocean ridge basalt (E-MORB) signatures. The Early Ordovician Menzie Creek volcanic rocks of the Anvil District display trace element geochemical signatures intermediate between ocean island basalt (OIB) and E-MORB, whereas the Middle–Late Ordovician volcanic rocks from the Misty Creek Embayment have OIB signatures. Differences in the trace element geochemistry of the sample suites are attributed to the degree of partial melting. The Menzie Creek volcanic rocks formed from large volume melts of enriched mantle that diluted incompatible element signatures in the Early Ordovician. Late Ordovician magmatism produced the Misty Creek Embayment samples, where restricted melt volumes of an enriched mantle source resulted in the most enriched samples geochemically. The Keno Hill samples represent the shallowest melting of the analysed samples and may have resulted from melting of heterogenous subcontinental lithospheric mantle. Magmatic zircons from a Keno Hill metavolcanic sample analysed by chemical abrasion thermal ionization mass spectrometry resulted in a primary deposition age of c. 296 ± 0.36 Ma (Early Permian), during a period with little magmatism in the Selwyn Basin and representing a previously unknown unit in the area.
author2 Natural Resources Canada
Society of Economic Geologists Foundation
Arthur B. McDonald Canadian Astroparticle Physics Research Institute
format Article in Journal/Newspaper
author Scanlan, Emma J.
Leybourne, Matthew I.
Layton-Matthews, Daniel
Van Wagoner, Nancy
Paradis, Suzanne
Piercey, Steve
Crowley, James L.
spellingShingle Scanlan, Emma J.
Leybourne, Matthew I.
Layton-Matthews, Daniel
Van Wagoner, Nancy
Paradis, Suzanne
Piercey, Steve
Crowley, James L.
Petrology and lithogeochemistry of Paleozoic alkalic magmatism in the Selwyn Basin, Yukon, Canada
author_facet Scanlan, Emma J.
Leybourne, Matthew I.
Layton-Matthews, Daniel
Van Wagoner, Nancy
Paradis, Suzanne
Piercey, Steve
Crowley, James L.
author_sort Scanlan, Emma J.
title Petrology and lithogeochemistry of Paleozoic alkalic magmatism in the Selwyn Basin, Yukon, Canada
title_short Petrology and lithogeochemistry of Paleozoic alkalic magmatism in the Selwyn Basin, Yukon, Canada
title_full Petrology and lithogeochemistry of Paleozoic alkalic magmatism in the Selwyn Basin, Yukon, Canada
title_fullStr Petrology and lithogeochemistry of Paleozoic alkalic magmatism in the Selwyn Basin, Yukon, Canada
title_full_unstemmed Petrology and lithogeochemistry of Paleozoic alkalic magmatism in the Selwyn Basin, Yukon, Canada
title_sort petrology and lithogeochemistry of paleozoic alkalic magmatism in the selwyn basin, yukon, canada
publisher Canadian Science Publishing
publishDate 2024
url http://dx.doi.org/10.1139/cjes-2023-0081
https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2023-0081
https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2023-0081
genre Keno Hill
Ocean Island
Yukon
genre_facet Keno Hill
Ocean Island
Yukon
op_source Canadian Journal of Earth Sciences
volume 61, issue 5, page 597-619
ISSN 0008-4077 1480-3313
op_rights http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining
op_doi https://doi.org/10.1139/cjes-2023-0081
container_title Canadian Journal of Earth Sciences
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