Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands
New detrital mineral age and whole-rock geochemical data provide the first constraints on the composition and source of North American Triassic strata in the northern Canadian Cordillera. Conodont-bearing Triassic strata collected from five locations across west-central to southeastern Yukon contain...
Published in: | Canadian Journal of Earth Sciences |
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crcansciencepubl:10.1139/e09-065 2024-09-15T18:02:04+00:00 Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands Beranek, Luke P. Mortensen, James K. Orchard, Michael J. Ullrich, Thomas Colpron, Maurice 2010 http://dx.doi.org/10.1139/e09-065 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E09-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/E09-065 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 47, issue 1, page 53-73 ISSN 0008-4077 1480-3313 journal-article 2010 crcansciencepubl https://doi.org/10.1139/e09-065 2024-08-01T04:10:03Z New detrital mineral age and whole-rock geochemical data provide the first constraints on the composition and source of North American Triassic strata in the northern Canadian Cordillera. Conodont-bearing Triassic strata collected from five locations across west-central to southeastern Yukon contain trace-element ratios ((La/Yb) N = ∼8; Eu/Eu* = ∼0.66), εNd (248 Ma) values (–9 to –10), and detrital zircon ages (400–680, 980–1200, 1500–1650, 1800–2000 Ma) that correspond with those of coeval rocks in the Canadian Arctic Islands and the Western Canada Sedimentary Basin of British Columbia and Alberta. The majority of detrital zircons were cannibalized from Ellesmerian clastic wedge and western Laurentian margin strata and recycled into Triassic rocks. Conspicuous early Paleozoic and Neoproterozoic detrital zircons may have been ultimately derived from allochthonous rocks of Caledonian–Baltican affinity in northern North America, such as the Pearya and Arctic Alaska – Chukotka terranes. One Early Triassic unit in eastern Yukon contains ca. 360 Ma detrital muscovite, and samples from several localities include single-grain occurrences of Mississippian detrital zircon. Mississippian detrital mineral ages likely record a partial source from mid-Paleozoic rocks of the allochthonous Slide Mountain and Yukon–Tanana terranes following their Late Permian – Early Triassic emplacement onto the Cordilleran margin. More substantial evidence of terrane-derived sediment deposited along the North American margin may be further identified within Triassic strata that are exposed to the west (outboard) of our sample sites, immediately adjacent to the Slide Mountain and Yukon–Tanana terranes. Article in Journal/Newspaper Chukotka Alaska Yukon Canadian Science Publishing Canadian Journal of Earth Sciences 47 1 53 73 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
New detrital mineral age and whole-rock geochemical data provide the first constraints on the composition and source of North American Triassic strata in the northern Canadian Cordillera. Conodont-bearing Triassic strata collected from five locations across west-central to southeastern Yukon contain trace-element ratios ((La/Yb) N = ∼8; Eu/Eu* = ∼0.66), εNd (248 Ma) values (–9 to –10), and detrital zircon ages (400–680, 980–1200, 1500–1650, 1800–2000 Ma) that correspond with those of coeval rocks in the Canadian Arctic Islands and the Western Canada Sedimentary Basin of British Columbia and Alberta. The majority of detrital zircons were cannibalized from Ellesmerian clastic wedge and western Laurentian margin strata and recycled into Triassic rocks. Conspicuous early Paleozoic and Neoproterozoic detrital zircons may have been ultimately derived from allochthonous rocks of Caledonian–Baltican affinity in northern North America, such as the Pearya and Arctic Alaska – Chukotka terranes. One Early Triassic unit in eastern Yukon contains ca. 360 Ma detrital muscovite, and samples from several localities include single-grain occurrences of Mississippian detrital zircon. Mississippian detrital mineral ages likely record a partial source from mid-Paleozoic rocks of the allochthonous Slide Mountain and Yukon–Tanana terranes following their Late Permian – Early Triassic emplacement onto the Cordilleran margin. More substantial evidence of terrane-derived sediment deposited along the North American margin may be further identified within Triassic strata that are exposed to the west (outboard) of our sample sites, immediately adjacent to the Slide Mountain and Yukon–Tanana terranes. |
author2 |
Colpron, Maurice |
format |
Article in Journal/Newspaper |
author |
Beranek, Luke P. Mortensen, James K. Orchard, Michael J. Ullrich, Thomas |
spellingShingle |
Beranek, Luke P. Mortensen, James K. Orchard, Michael J. Ullrich, Thomas Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands |
author_facet |
Beranek, Luke P. Mortensen, James K. Orchard, Michael J. Ullrich, Thomas |
author_sort |
Beranek, Luke P. |
title |
Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands |
title_short |
Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands |
title_full |
Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands |
title_fullStr |
Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands |
title_full_unstemmed |
Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands |
title_sort |
provenance of north american triassic strata from west-central and southeastern yukon: correlations with coeval strata in the western canada sedimentary basin and canadian arctic islands |
publisher |
Canadian Science Publishing |
publishDate |
2010 |
url |
http://dx.doi.org/10.1139/e09-065 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E09-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/E09-065 |
genre |
Chukotka Alaska Yukon |
genre_facet |
Chukotka Alaska Yukon |
op_source |
Canadian Journal of Earth Sciences volume 47, issue 1, page 53-73 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e09-065 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
47 |
container_issue |
1 |
container_start_page |
53 |
op_container_end_page |
73 |
_version_ |
1810439169736966144 |