A juvenile Paleozoic ocean floor origin for eastern Stikinia, Canadian Cordillera
International audience The Cordillera of Canada and Alaska is a type example of an accretionary orogen, but the origin of some terranes remains contentious (e.g., Stikinia of British Columbia and Yukon, Canada). Presented herein are igneous and detrital zircon U/Pb-Hf and trace-element data, as well...
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Format: | Article in Journal/Newspaper |
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HAL CCSD
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Online Access: | https://hal.science/hal-03692350 https://hal.science/hal-03692350/document https://hal.science/hal-03692350/file/ges02459.pdf https://doi.org/10.1130/GES02459.1 |
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ftunivlyon:oai:HAL:hal-03692350v1 2023-06-11T04:17:36+02:00 A juvenile Paleozoic ocean floor origin for eastern Stikinia, Canadian Cordillera Ootes, Luke Milidragovic, Dejan Friedman, Richard Wall, Corey Cordey, Fabrice Luo, Yan Jones, Gabrielle Pearson, D. Graham Bergen, Anika British Columbia Geological Survey Branch Department of Earth, Ocean and Atmospheric Sciences Vancouver (UBC EOAS) University of British Columbia (UBC) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) University of Alberta 2022-05-12 https://hal.science/hal-03692350 https://hal.science/hal-03692350/document https://hal.science/hal-03692350/file/ges02459.pdf https://doi.org/10.1130/GES02459.1 en eng HAL CCSD Geological Society of America info:eu-repo/semantics/altIdentifier/doi/10.1130/GES02459.1 hal-03692350 https://hal.science/hal-03692350 https://hal.science/hal-03692350/document https://hal.science/hal-03692350/file/ges02459.pdf doi:10.1130/GES02459.1 http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess EISSN: 1553-040X Geosphere https://hal.science/hal-03692350 Geosphere, 2022, ⟨10.1130/GES02459.1⟩ https://pubs.geoscienceworld.org/gsa/geosphere/article/doi/10.1130/GES02459.1/613638/A-juvenile-Paleozoic-ocean-floor-origin-for [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2022 ftunivlyon https://doi.org/10.1130/GES02459.110.1130/GES02459.1/613638/A-juvenile-Paleozoic-ocean-floor-origin-for 2023-05-03T16:38:00Z International audience The Cordillera of Canada and Alaska is a type example of an accretionary orogen, but the origin of some terranes remains contentious (e.g., Stikinia of British Columbia and Yukon, Canada). Presented herein are igneous and detrital zircon U/Pb-Hf and trace-element data, as well as the first radiolarian ages from the Asitka Group, the basement to eastern Stikinia. The data are used to evaluate the role of juvenile and ancient crust in the evolution of Stikinia and the tectonic environment of magmatism. Two rhyolites are dated by U-Pb zircon at 288.64 ± 0.21 Ma and 293.89 ± 0.31 Ma, with εHf(t) = +10. Red chert contains radiolarians that are correlated with P. scalprata m. rhombothoracata + Ruzhencevispongus uralicus assemblages (Artinskian–Kungurian). Detrital zircon U/Pb-Hf from a rare Asitka Group sandstone have a mode at ca. 320 Ma and εHf(t) +10 to +16; the detrital zircon suite includes five Paleoproterozoic zircons (~5% of the population). Detrital zircons from a stratigraphically overlying Hazelton Group (Telkwa Formation) volcanic sandstone indicate deposition at ca. 196 Ma with zircon εHf(t) that are on a crustal evolution line anchored from the Asitka Group. Zircon trace-element data indicate that the Carboniferous detrital zircons formed in an ocean arc environment. The Proterozoic detrital zircons were derived from a peripheral landmass, but there is no zircon εHf(t) evidence that such a landmass played any role in the magmatic evolution of eastern Stikinia. The data support that eastern Stikinia formed on Paleozoic ocean floor during the Carboniferous to early Permian. Consistent with previous fossil modeling, zircon statistical comparisons demonstrate that Stikinia and Wrangellia were related terranes during the Carboniferous to Permian, and they evolved separately from Yukon-Tanana terrane and cratonic North America. Article in Journal/Newspaper Alaska Yukon Université de Lyon: HAL Yukon Canada British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Hazelton ENVELOPE(-127.670,-127.670,55.250,55.250) Telkwa ENVELOPE(-127.055,-127.055,54.685,54.685) Geosphere 18 4 1297 1315 |
institution |
Open Polar |
collection |
Université de Lyon: HAL |
op_collection_id |
ftunivlyon |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Ootes, Luke Milidragovic, Dejan Friedman, Richard Wall, Corey Cordey, Fabrice Luo, Yan Jones, Gabrielle Pearson, D. Graham Bergen, Anika A juvenile Paleozoic ocean floor origin for eastern Stikinia, Canadian Cordillera |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience The Cordillera of Canada and Alaska is a type example of an accretionary orogen, but the origin of some terranes remains contentious (e.g., Stikinia of British Columbia and Yukon, Canada). Presented herein are igneous and detrital zircon U/Pb-Hf and trace-element data, as well as the first radiolarian ages from the Asitka Group, the basement to eastern Stikinia. The data are used to evaluate the role of juvenile and ancient crust in the evolution of Stikinia and the tectonic environment of magmatism. Two rhyolites are dated by U-Pb zircon at 288.64 ± 0.21 Ma and 293.89 ± 0.31 Ma, with εHf(t) = +10. Red chert contains radiolarians that are correlated with P. scalprata m. rhombothoracata + Ruzhencevispongus uralicus assemblages (Artinskian–Kungurian). Detrital zircon U/Pb-Hf from a rare Asitka Group sandstone have a mode at ca. 320 Ma and εHf(t) +10 to +16; the detrital zircon suite includes five Paleoproterozoic zircons (~5% of the population). Detrital zircons from a stratigraphically overlying Hazelton Group (Telkwa Formation) volcanic sandstone indicate deposition at ca. 196 Ma with zircon εHf(t) that are on a crustal evolution line anchored from the Asitka Group. Zircon trace-element data indicate that the Carboniferous detrital zircons formed in an ocean arc environment. The Proterozoic detrital zircons were derived from a peripheral landmass, but there is no zircon εHf(t) evidence that such a landmass played any role in the magmatic evolution of eastern Stikinia. The data support that eastern Stikinia formed on Paleozoic ocean floor during the Carboniferous to early Permian. Consistent with previous fossil modeling, zircon statistical comparisons demonstrate that Stikinia and Wrangellia were related terranes during the Carboniferous to Permian, and they evolved separately from Yukon-Tanana terrane and cratonic North America. |
author2 |
British Columbia Geological Survey Branch Department of Earth, Ocean and Atmospheric Sciences Vancouver (UBC EOAS) University of British Columbia (UBC) Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) University of Alberta |
format |
Article in Journal/Newspaper |
author |
Ootes, Luke Milidragovic, Dejan Friedman, Richard Wall, Corey Cordey, Fabrice Luo, Yan Jones, Gabrielle Pearson, D. Graham Bergen, Anika |
author_facet |
Ootes, Luke Milidragovic, Dejan Friedman, Richard Wall, Corey Cordey, Fabrice Luo, Yan Jones, Gabrielle Pearson, D. Graham Bergen, Anika |
author_sort |
Ootes, Luke |
title |
A juvenile Paleozoic ocean floor origin for eastern Stikinia, Canadian Cordillera |
title_short |
A juvenile Paleozoic ocean floor origin for eastern Stikinia, Canadian Cordillera |
title_full |
A juvenile Paleozoic ocean floor origin for eastern Stikinia, Canadian Cordillera |
title_fullStr |
A juvenile Paleozoic ocean floor origin for eastern Stikinia, Canadian Cordillera |
title_full_unstemmed |
A juvenile Paleozoic ocean floor origin for eastern Stikinia, Canadian Cordillera |
title_sort |
juvenile paleozoic ocean floor origin for eastern stikinia, canadian cordillera |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03692350 https://hal.science/hal-03692350/document https://hal.science/hal-03692350/file/ges02459.pdf https://doi.org/10.1130/GES02459.1 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) ENVELOPE(-127.670,-127.670,55.250,55.250) ENVELOPE(-127.055,-127.055,54.685,54.685) |
geographic |
Yukon Canada British Columbia Hazelton Telkwa |
geographic_facet |
Yukon Canada British Columbia Hazelton Telkwa |
genre |
Alaska Yukon |
genre_facet |
Alaska Yukon |
op_source |
EISSN: 1553-040X Geosphere https://hal.science/hal-03692350 Geosphere, 2022, ⟨10.1130/GES02459.1⟩ https://pubs.geoscienceworld.org/gsa/geosphere/article/doi/10.1130/GES02459.1/613638/A-juvenile-Paleozoic-ocean-floor-origin-for |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/GES02459.1 hal-03692350 https://hal.science/hal-03692350 https://hal.science/hal-03692350/document https://hal.science/hal-03692350/file/ges02459.pdf doi:10.1130/GES02459.1 |
op_rights |
http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1130/GES02459.110.1130/GES02459.1/613638/A-juvenile-Paleozoic-ocean-floor-origin-for |
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Geosphere |
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18 |
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4 |
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1297 |
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1315 |
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1768376948759724032 |