Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut

Cowan, Beth (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.

[img] [English] PDF - Accepted Version
Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.

Download (89Mb)

Abstract

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).

Item Type: Thesis (Masters)
URI: http://research.library.mun.ca/id/eprint/11633
Item ID: 11633
Additional Information: Includes bibliographical references.
Keywords: submerged shorelines, multibeam bathymetry, postglacial sea level, Cumberland Peninsula, Coastal geomorphology
Department(s): Humanities and Social Sciences, Faculty of > Geography
Date: October 2015
Date Type: Submission
Geographic Location: Nunavut--Baffin Island
Library of Congress Subject Heading: Submerged lands--Nunavut--Baffin Island; Submarine topography--Nunavut--Baffin Island; Geology, Structural--Nunavut--Baffin Island; Sea level--Nunavut--Baffin Island

Actions (login required)

View Item View Item

Downloads

Downloads per month over the past year

View more statistics