Integrated modeling for stratigraphic development of the Mackenzie Trough and the Eastern Beaufort Shelf, N.W.T., Canada
Glaciated shelves develop under the influence of a more complex suite of processes than most non-glaciated shelves. Amongst the specific processes are the glacially-influenced sediment supply and the glacial-isostatic adjustment (GIA), which is largely responsible for the complex nature of regional...
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ftuvicpubl:oai:dspace.library.uvic.ca:1828/4122 2023-05-15T15:18:32+02:00 Integrated modeling for stratigraphic development of the Mackenzie Trough and the Eastern Beaufort Shelf, N.W.T., Canada Picard, Kim Hill, Philip R. Juniper, S. K. 2012 application/pdf http://hdl.handle.net/1828/4122 English en eng http://hdl.handle.net/1828/4122 Available to the World Wide Web Arctic Eastern Beaufort Shelf Stratigraphy geology stratigraphic simulation model sedflux glacio-isostatic adjustment relative sea-level Mackenzie Trough Mackenzie River Delta marine Canada Thesis 2012 ftuvicpubl 2022-05-19T06:10:27Z Glaciated shelves develop under the influence of a more complex suite of processes than most non-glaciated shelves. Amongst the specific processes are the glacially-influenced sediment supply and the glacial-isostatic adjustment (GIA), which is largely responsible for the complex nature of regional relative sea-levels (RSLs). This study first characterizes the impact of GIA on the Mackenzie-Beaufort region by presenting a new set of RSL curves derived from a modern gravitationally self-consistent sea level model computing the effects of glacio-hydro isostasy, geoid changes, and true polar wander. The results of the RSL model present cross-shelf variations in the order of 100 m and along-shelf of 30 m during the LGM. The model also suggests a different timing and range to the single RSL curve presently used for this region. Depending on the location, the lowstand is modeled between 14 and 12 ka BP and reached between 85 and 140 m below present sea-level. These new findings are used in the second part of the study to evaluate the impacts of GIA along with other factors on the Late Quaternary evolution of the Canadian Beaufort Shelf. SedFlux, a process-based stratigraphic simulation model is used. Uncertainties associated with post-LGM conditions create difficulties in establishing good model parameterization. Thus, simulations are first performed on the Mackenzie Trough area, where data availability permits better evaluation and constraint of parameters that are then applied to the more data poor Eastern Beaufort Shelf environment. The results of the stratigraphic simulations suggest that the ice sheet margin in the Mackenzie-Beaufort region was more extensive than previously assumed. The impact of GIA on the stratigraphy of the Mackenzie Trough is to develop more progradational than retrogradational stratigraphic features. Simulations of the Eastern Beaufort Shelf suggest that a previously dated sample from the Uviluk borehole is not a RSL indicator as previously thought and by taking this into consideration, the ... Thesis Arctic Ice Sheet Mackenzie river University of Victoria (Canada): UVicDSpace Arctic Beaufort Shelf ENVELOPE(-142.500,-142.500,70.000,70.000) Canada Mackenzie River MacKenzie Trough ENVELOPE(-138.025,-138.025,69.528,69.528) |
institution |
Open Polar |
collection |
University of Victoria (Canada): UVicDSpace |
op_collection_id |
ftuvicpubl |
language |
English |
topic |
Arctic Eastern Beaufort Shelf Stratigraphy geology stratigraphic simulation model sedflux glacio-isostatic adjustment relative sea-level Mackenzie Trough Mackenzie River Delta marine Canada |
spellingShingle |
Arctic Eastern Beaufort Shelf Stratigraphy geology stratigraphic simulation model sedflux glacio-isostatic adjustment relative sea-level Mackenzie Trough Mackenzie River Delta marine Canada Picard, Kim Integrated modeling for stratigraphic development of the Mackenzie Trough and the Eastern Beaufort Shelf, N.W.T., Canada |
topic_facet |
Arctic Eastern Beaufort Shelf Stratigraphy geology stratigraphic simulation model sedflux glacio-isostatic adjustment relative sea-level Mackenzie Trough Mackenzie River Delta marine Canada |
description |
Glaciated shelves develop under the influence of a more complex suite of processes than most non-glaciated shelves. Amongst the specific processes are the glacially-influenced sediment supply and the glacial-isostatic adjustment (GIA), which is largely responsible for the complex nature of regional relative sea-levels (RSLs). This study first characterizes the impact of GIA on the Mackenzie-Beaufort region by presenting a new set of RSL curves derived from a modern gravitationally self-consistent sea level model computing the effects of glacio-hydro isostasy, geoid changes, and true polar wander. The results of the RSL model present cross-shelf variations in the order of 100 m and along-shelf of 30 m during the LGM. The model also suggests a different timing and range to the single RSL curve presently used for this region. Depending on the location, the lowstand is modeled between 14 and 12 ka BP and reached between 85 and 140 m below present sea-level. These new findings are used in the second part of the study to evaluate the impacts of GIA along with other factors on the Late Quaternary evolution of the Canadian Beaufort Shelf. SedFlux, a process-based stratigraphic simulation model is used. Uncertainties associated with post-LGM conditions create difficulties in establishing good model parameterization. Thus, simulations are first performed on the Mackenzie Trough area, where data availability permits better evaluation and constraint of parameters that are then applied to the more data poor Eastern Beaufort Shelf environment. The results of the stratigraphic simulations suggest that the ice sheet margin in the Mackenzie-Beaufort region was more extensive than previously assumed. The impact of GIA on the stratigraphy of the Mackenzie Trough is to develop more progradational than retrogradational stratigraphic features. Simulations of the Eastern Beaufort Shelf suggest that a previously dated sample from the Uviluk borehole is not a RSL indicator as previously thought and by taking this into consideration, the ... |
author2 |
Hill, Philip R. Juniper, S. K. |
format |
Thesis |
author |
Picard, Kim |
author_facet |
Picard, Kim |
author_sort |
Picard, Kim |
title |
Integrated modeling for stratigraphic development of the Mackenzie Trough and the Eastern Beaufort Shelf, N.W.T., Canada |
title_short |
Integrated modeling for stratigraphic development of the Mackenzie Trough and the Eastern Beaufort Shelf, N.W.T., Canada |
title_full |
Integrated modeling for stratigraphic development of the Mackenzie Trough and the Eastern Beaufort Shelf, N.W.T., Canada |
title_fullStr |
Integrated modeling for stratigraphic development of the Mackenzie Trough and the Eastern Beaufort Shelf, N.W.T., Canada |
title_full_unstemmed |
Integrated modeling for stratigraphic development of the Mackenzie Trough and the Eastern Beaufort Shelf, N.W.T., Canada |
title_sort |
integrated modeling for stratigraphic development of the mackenzie trough and the eastern beaufort shelf, n.w.t., canada |
publishDate |
2012 |
url |
http://hdl.handle.net/1828/4122 |
long_lat |
ENVELOPE(-142.500,-142.500,70.000,70.000) ENVELOPE(-138.025,-138.025,69.528,69.528) |
geographic |
Arctic Beaufort Shelf Canada Mackenzie River MacKenzie Trough |
geographic_facet |
Arctic Beaufort Shelf Canada Mackenzie River MacKenzie Trough |
genre |
Arctic Ice Sheet Mackenzie river |
genre_facet |
Arctic Ice Sheet Mackenzie river |
op_relation |
http://hdl.handle.net/1828/4122 |
op_rights |
Available to the World Wide Web |
_version_ |
1766348727183736832 |