Biostratigraphic evidence for incremental tectonic development of early Cambrian deep-water environments in the Misty Creek embayment (Selwyn basin, Northwest Territories, Canada)
The early evolution of the Misty Creek embayment (MCE), a prominent, northwest-trending sub-basin of the economically important Selwyn basin, is poorly understood. The abrupt contact between Cambrian Stage 4 (traditional lower Cambrian) carbonate ramp strata of the Sekwi Formation and overlying Miao...
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ftunivtoronto:oai:tspace.library.utoronto.ca:1807/110269 2023-05-15T17:46:45+02:00 Biostratigraphic evidence for incremental tectonic development of early Cambrian deep-water environments in the Misty Creek embayment (Selwyn basin, Northwest Territories, Canada) Scott, R. William Turner, Elizabeth C. MacNaughton, Robert B Fallas, Karen M 2021-10-25 application/pdf application/vnd.openxmlformats-officedocument.spreadsheetml.sheet application/msword http://hdl.handle.net/1807/110269 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2021-0049 unknown University of Toronto 0008-4077 http://hdl.handle.net/1807/110269 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2021-0049 Article Article Post-Print 2021 ftunivtoronto 2022-02-27T18:22:05Z The early evolution of the Misty Creek embayment (MCE), a prominent, northwest-trending sub-basin of the economically important Selwyn basin, is poorly understood. The abrupt contact between Cambrian Stage 4 (traditional lower Cambrian) carbonate ramp strata of the Sekwi Formation and overlying Miaolingian (traditional middle Cambrian) deep-water, calciturbiditic strata of the Hess River Formation has been regarded as diachronous. This important transition, which marks the onset of long-lived, deep-water conditions in the MCE, remains unexplained. This study uses biostratigraphic data from a previously undescribed location in the MCE, existing biostratigraphic and lithostratigraphic data from the 1970s, and regional thickness patterns to characterise the sharp yet diachronous transition from lithofacies typical of the Sekwi Formation to those typical of the Hess River Formation. The dramatic change in depositional environments was diachronous yet non-gradational, precluding a eustatic cause. The change was geologically abrupt, probably through two extension-related subsidence events, with different geographic extents, which heralded the MCE’s long life as a deep-water basin. The onset of deep-water conditions in the MCE occurred semi-contemporaneously with other extension-related events that are recorded in the northern Canadian Cordillera, demonstrating that Cambrian Series 2 - Miaolingian was a time of widespread extension and subsidence along the western margin of Laurentia. 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 Northwest Territories University of Toronto: Research Repository T-Space Northwest Territories Canada Hess ENVELOPE(-65.133,-65.133,-67.200,-67.200) Selwyn ENVELOPE(-138.287,-138.287,62.799,62.799) Misty Creek ENVELOPE(-131.187,-131.187,64.116,64.116) Hess River ENVELOPE(-133.987,-133.987,63.550,63.550) |
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Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
unknown |
description |
The early evolution of the Misty Creek embayment (MCE), a prominent, northwest-trending sub-basin of the economically important Selwyn basin, is poorly understood. The abrupt contact between Cambrian Stage 4 (traditional lower Cambrian) carbonate ramp strata of the Sekwi Formation and overlying Miaolingian (traditional middle Cambrian) deep-water, calciturbiditic strata of the Hess River Formation has been regarded as diachronous. This important transition, which marks the onset of long-lived, deep-water conditions in the MCE, remains unexplained. This study uses biostratigraphic data from a previously undescribed location in the MCE, existing biostratigraphic and lithostratigraphic data from the 1970s, and regional thickness patterns to characterise the sharp yet diachronous transition from lithofacies typical of the Sekwi Formation to those typical of the Hess River Formation. The dramatic change in depositional environments was diachronous yet non-gradational, precluding a eustatic cause. The change was geologically abrupt, probably through two extension-related subsidence events, with different geographic extents, which heralded the MCE’s long life as a deep-water basin. The onset of deep-water conditions in the MCE occurred semi-contemporaneously with other extension-related events that are recorded in the northern Canadian Cordillera, demonstrating that Cambrian Series 2 - Miaolingian was a time of widespread extension and subsidence along the western margin of Laurentia. 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 |
Scott, R. William Turner, Elizabeth C. MacNaughton, Robert B Fallas, Karen M |
spellingShingle |
Scott, R. William Turner, Elizabeth C. MacNaughton, Robert B Fallas, Karen M Biostratigraphic evidence for incremental tectonic development of early Cambrian deep-water environments in the Misty Creek embayment (Selwyn basin, Northwest Territories, Canada) |
author_facet |
Scott, R. William Turner, Elizabeth C. MacNaughton, Robert B Fallas, Karen M |
author_sort |
Scott, R. William |
title |
Biostratigraphic evidence for incremental tectonic development of early Cambrian deep-water environments in the Misty Creek embayment (Selwyn basin, Northwest Territories, Canada) |
title_short |
Biostratigraphic evidence for incremental tectonic development of early Cambrian deep-water environments in the Misty Creek embayment (Selwyn basin, Northwest Territories, Canada) |
title_full |
Biostratigraphic evidence for incremental tectonic development of early Cambrian deep-water environments in the Misty Creek embayment (Selwyn basin, Northwest Territories, Canada) |
title_fullStr |
Biostratigraphic evidence for incremental tectonic development of early Cambrian deep-water environments in the Misty Creek embayment (Selwyn basin, Northwest Territories, Canada) |
title_full_unstemmed |
Biostratigraphic evidence for incremental tectonic development of early Cambrian deep-water environments in the Misty Creek embayment (Selwyn basin, Northwest Territories, Canada) |
title_sort |
biostratigraphic evidence for incremental tectonic development of early cambrian deep-water environments in the misty creek embayment (selwyn basin, northwest territories, canada) |
publisher |
University of Toronto |
publishDate |
2021 |
url |
http://hdl.handle.net/1807/110269 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2021-0049 |
long_lat |
ENVELOPE(-65.133,-65.133,-67.200,-67.200) ENVELOPE(-138.287,-138.287,62.799,62.799) ENVELOPE(-131.187,-131.187,64.116,64.116) ENVELOPE(-133.987,-133.987,63.550,63.550) |
geographic |
Northwest Territories Canada Hess Selwyn Misty Creek Hess River |
geographic_facet |
Northwest Territories Canada Hess Selwyn Misty Creek Hess River |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_relation |
0008-4077 http://hdl.handle.net/1807/110269 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2021-0049 |
_version_ |
1766150589957275648 |