Investigating the Paleozoic-Mesozoic low-temperature thermal history of the southwestern Canadian Arctic: insights from (U-Th)/He thermochronology
The Arctic Amerasia Basin, located between the Canadian margin and Alaska, formed by purported Jurassic–Cretaceous rifting related to the rotation of the Arctic Alaska – Chukotka microcontinent from northern Laurentia. Rifting may have been accompanied by rift shoulder uplift and cooling that is rec...
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ftunivtoronto:oai:localhost:1807/75886 2023-05-15T13:22:45+02:00 Investigating the Paleozoic-Mesozoic low-temperature thermal history of the southwestern Canadian Arctic: insights from (U-Th)/He thermochronology Midwinter, Derrick Powell, Jeremy Schneider, David Dewing, Keith 2016-11-08 http://hdl.handle.net/1807/75886 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2016-0088 unknown NRC Research Press (a division of Canadian Science Publishing) 0008-4077 http://hdl.handle.net/1807/75886 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2016-0088 Article 2016 ftunivtoronto 2020-06-17T12:03:10Z The Arctic Amerasia Basin, located between the Canadian margin and Alaska, formed by purported Jurassic–Cretaceous rifting related to the rotation of the Arctic Alaska – Chukotka microcontinent from northern Laurentia. Rifting may have been accompanied by rift shoulder uplift and cooling that is recorded in low-temperature thermochronometers. Furthermore, the southwestern Canadian Arctic has a widespread Devonian–Cretaceous unconformity with a poorly understood burial-unroofing history. We evaluate new zircon (U–Th)/He thermochronology (ZHe) and organic maturity (vitrinite reflectance (VRo)) data from Neoproterozoic strata of the Amundsen Basin, Cambrian strata of the Arctic Platform, and Devonian strata of the Franklinian Basin to help resolve the sedimentary thickness deposited and eroded during the time represented by the regional unconformity. ZHe and VRo models identify the thermal maximum occurring between the late Paleozoic – Mesozoic interval. Proximal to the rifted Canadian margin, models estimate 3.7–4.5 km of deposition between the Devonian–Cretaceous, in marked contrast to <1 km towards the craton. Jurassic–Cretaceous exhumation is estimated at 2.3–3.5 km and is more uniform across the region. Although the magnitude of burial and erosion can be resolved by modelling, the timing of these events cannot be elucidated with confidence. The thermochronology models can be satisfied by either (1) late Paleozoic – early Mesozoic burial with a thermal maximum prior to Jurassic rifting, followed by cooling; or (2) Late Devonian maximum burial, with gradual unroofing until Cretaceous sedimentation. Although continued deposition into the Mesozoic towards the craton interior seems unlikely, it remains possible that there was continued deposition proximal to the rifted Canadian margin. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. Article in Journal/Newspaper amundsen basin Arctic Chukotka Alaska University of Toronto: Research Repository T-Space Amerasia Basin ENVELOPE(-170.000,-170.000,80.000,80.000) Amundsen Basin ENVELOPE(74.000,74.000,87.000,87.000) Arctic |
institution |
Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
unknown |
description |
The Arctic Amerasia Basin, located between the Canadian margin and Alaska, formed by purported Jurassic–Cretaceous rifting related to the rotation of the Arctic Alaska – Chukotka microcontinent from northern Laurentia. Rifting may have been accompanied by rift shoulder uplift and cooling that is recorded in low-temperature thermochronometers. Furthermore, the southwestern Canadian Arctic has a widespread Devonian–Cretaceous unconformity with a poorly understood burial-unroofing history. We evaluate new zircon (U–Th)/He thermochronology (ZHe) and organic maturity (vitrinite reflectance (VRo)) data from Neoproterozoic strata of the Amundsen Basin, Cambrian strata of the Arctic Platform, and Devonian strata of the Franklinian Basin to help resolve the sedimentary thickness deposited and eroded during the time represented by the regional unconformity. ZHe and VRo models identify the thermal maximum occurring between the late Paleozoic – Mesozoic interval. Proximal to the rifted Canadian margin, models estimate 3.7–4.5 km of deposition between the Devonian–Cretaceous, in marked contrast to <1 km towards the craton. Jurassic–Cretaceous exhumation is estimated at 2.3–3.5 km and is more uniform across the region. Although the magnitude of burial and erosion can be resolved by modelling, the timing of these events cannot be elucidated with confidence. The thermochronology models can be satisfied by either (1) late Paleozoic – early Mesozoic burial with a thermal maximum prior to Jurassic rifting, followed by cooling; or (2) Late Devonian maximum burial, with gradual unroofing until Cretaceous sedimentation. Although continued deposition into the Mesozoic towards the craton interior seems unlikely, it remains possible that there was continued deposition proximal to the rifted Canadian margin. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. |
format |
Article in Journal/Newspaper |
author |
Midwinter, Derrick Powell, Jeremy Schneider, David Dewing, Keith |
spellingShingle |
Midwinter, Derrick Powell, Jeremy Schneider, David Dewing, Keith Investigating the Paleozoic-Mesozoic low-temperature thermal history of the southwestern Canadian Arctic: insights from (U-Th)/He thermochronology |
author_facet |
Midwinter, Derrick Powell, Jeremy Schneider, David Dewing, Keith |
author_sort |
Midwinter, Derrick |
title |
Investigating the Paleozoic-Mesozoic low-temperature thermal history of the southwestern Canadian Arctic: insights from (U-Th)/He thermochronology |
title_short |
Investigating the Paleozoic-Mesozoic low-temperature thermal history of the southwestern Canadian Arctic: insights from (U-Th)/He thermochronology |
title_full |
Investigating the Paleozoic-Mesozoic low-temperature thermal history of the southwestern Canadian Arctic: insights from (U-Th)/He thermochronology |
title_fullStr |
Investigating the Paleozoic-Mesozoic low-temperature thermal history of the southwestern Canadian Arctic: insights from (U-Th)/He thermochronology |
title_full_unstemmed |
Investigating the Paleozoic-Mesozoic low-temperature thermal history of the southwestern Canadian Arctic: insights from (U-Th)/He thermochronology |
title_sort |
investigating the paleozoic-mesozoic low-temperature thermal history of the southwestern canadian arctic: insights from (u-th)/he thermochronology |
publisher |
NRC Research Press (a division of Canadian Science Publishing) |
publishDate |
2016 |
url |
http://hdl.handle.net/1807/75886 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2016-0088 |
long_lat |
ENVELOPE(-170.000,-170.000,80.000,80.000) ENVELOPE(74.000,74.000,87.000,87.000) |
geographic |
Amerasia Basin Amundsen Basin Arctic |
geographic_facet |
Amerasia Basin Amundsen Basin Arctic |
genre |
amundsen basin Arctic Chukotka Alaska |
genre_facet |
amundsen basin Arctic Chukotka Alaska |
op_relation |
0008-4077 http://hdl.handle.net/1807/75886 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2016-0088 |
_version_ |
1766366796920651776 |