Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut
This thesis presents the discovery of eight submerged deltas (-19 to -45m), the first documented submerged boulder barricade, a submerged sill platform and spits off the coast of Cumberland Peninsula, eastern Baffin Island, NU. The geomorphic characteristics of these features in relation to contempo...
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Memorial University of Newfoundland
2015
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ftmemorialuniv:oai:research.library.mun.ca:11633 2023-10-01T03:54:51+02:00 Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut Cowan, Beth 2015-10 application/pdf https://research.library.mun.ca/11633/ https://research.library.mun.ca/11633/1/thesis.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/11633/1/thesis.pdf Cowan, Beth <https://research.library.mun.ca/view/creator_az/Cowan=3ABeth=3A=3A.html> (2015) Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut. Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 2015 ftmemorialuniv 2023-09-03T06:48:22Z This thesis presents the discovery of eight submerged deltas (-19 to -45m), the first documented submerged boulder barricade, a submerged sill platform and spits off the coast of Cumberland Peninsula, eastern Baffin Island, NU. The geomorphic characteristics of these features in relation to contemporaneous sea-level are presented and compared with the modern shore-zone. The submerged boulder barricade at Qikiqtarjuaq in the west indicates a -16 m sea level that isolated Broughton Channel from Baffin Bay to the north, changing the coastal dynamics from those observed at present. A shoreline deeper than -50 m planed off the fiord-mouth sill in Akpait Fiord and formed spits at -50 m and -30 m present depth. These features define a submerged shoreline gradient of 0.35 m/km to the east across northeastern Cumberland Peninsula. The linear gradient sediment supply requirements for delta formation suggest a synchronous lowstand, bracketed by ice margins and sourced from glacial outwash between 11.8-8.5 ka. This confirms the submergence trend hypothesized for eastern Cumberland Peninsula (Dyke, 1979). Thesis Baffin Bay Baffin Bay Baffin Island Baffin Cumberland Peninsula Nunavut Qikiqtarjuaq Memorial University of Newfoundland: Research Repository Nunavut Baffin Bay Baffin Island Cumberland Peninsula ENVELOPE(-64.497,-64.497,66.501,66.501) Qikiqtarjuaq ENVELOPE(-64.029,-64.029,67.557,67.557) Broughton Channel ENVELOPE(-64.030,-64.030,67.551,67.551) Akpait Fiord ENVELOPE(-61.890,-61.890,66.889,66.889) |
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Open Polar |
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Memorial University of Newfoundland: Research Repository |
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ftmemorialuniv |
language |
English |
description |
This thesis presents the discovery of eight submerged deltas (-19 to -45m), the first documented submerged boulder barricade, a submerged sill platform and spits off the coast of Cumberland Peninsula, eastern Baffin Island, NU. The geomorphic characteristics of these features in relation to contemporaneous sea-level are presented and compared with the modern shore-zone. The submerged boulder barricade at Qikiqtarjuaq in the west indicates a -16 m sea level that isolated Broughton Channel from Baffin Bay to the north, changing the coastal dynamics from those observed at present. A shoreline deeper than -50 m planed off the fiord-mouth sill in Akpait Fiord and formed spits at -50 m and -30 m present depth. These features define a submerged shoreline gradient of 0.35 m/km to the east across northeastern Cumberland Peninsula. The linear gradient sediment supply requirements for delta formation suggest a synchronous lowstand, bracketed by ice margins and sourced from glacial outwash between 11.8-8.5 ka. This confirms the submergence trend hypothesized for eastern Cumberland Peninsula (Dyke, 1979). |
format |
Thesis |
author |
Cowan, Beth |
spellingShingle |
Cowan, Beth Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut |
author_facet |
Cowan, Beth |
author_sort |
Cowan, Beth |
title |
Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut |
title_short |
Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut |
title_full |
Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut |
title_fullStr |
Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut |
title_full_unstemmed |
Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut |
title_sort |
shorelines beneath the sea: geomorphology and characterization of the postglacial sea-level lowstand, cumberland peninsula, baffin island, nunavut |
publisher |
Memorial University of Newfoundland |
publishDate |
2015 |
url |
https://research.library.mun.ca/11633/ https://research.library.mun.ca/11633/1/thesis.pdf |
long_lat |
ENVELOPE(-64.497,-64.497,66.501,66.501) ENVELOPE(-64.029,-64.029,67.557,67.557) ENVELOPE(-64.030,-64.030,67.551,67.551) ENVELOPE(-61.890,-61.890,66.889,66.889) |
geographic |
Nunavut Baffin Bay Baffin Island Cumberland Peninsula Qikiqtarjuaq Broughton Channel Akpait Fiord |
geographic_facet |
Nunavut Baffin Bay Baffin Island Cumberland Peninsula Qikiqtarjuaq Broughton Channel Akpait Fiord |
genre |
Baffin Bay Baffin Bay Baffin Island Baffin Cumberland Peninsula Nunavut Qikiqtarjuaq |
genre_facet |
Baffin Bay Baffin Bay Baffin Island Baffin Cumberland Peninsula Nunavut Qikiqtarjuaq |
op_relation |
https://research.library.mun.ca/11633/1/thesis.pdf Cowan, Beth <https://research.library.mun.ca/view/creator_az/Cowan=3ABeth=3A=3A.html> (2015) Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut. Masters thesis, Memorial University of Newfoundland. |
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thesis_license |
_version_ |
1778522843384905728 |