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Title: Late Quaternary ice flow in a West Greenland fjord and cross-shelf trough system: submarine landforms from Rink Isbrae to Uummannaq shelf and slope
Authors: Dowdeswell, Julian A.
Hogan, K.A.
O Cofaigh, Colm
Fugelli, E.M.G.
Evans, Jeff
Noormets, R.
Keywords: Arctic
Ice flow
Ice stream
Late Quaternary
Submarine landforms
Trough-mouth fan
West Greenland
Issue Date: 2014
Publisher: Elsevier Ltd / © The Authors
Citation: DOWDESWELL, J.A. ... et al, 2014. Late Quaternary ice flow in a West Greenland fjord and cross-shelf trough system: submarine landforms from Rink Isbrae to Uummannaq shelf and slope. Quaternary Science Reviews, 92, pp. 292 - 309.
Abstract: Sea-floor landforms and acoustic-stratigraphic records allow interpretation of the past form and flow of a westward-draining ice stream of the Greenland Ice Sheet, Rink Isbrae. The Late Pliocene-Pleistocene glacial package is several hundred metres thick and down-laps onto an upper Miocene horizon. Several acoustic facies are mapped from sub-bottom profiler records of the 400km-long Uummannaq fjord-shelf-slope system. An acoustically stratified facies covers much of the fjord and trough floor, interpreted as glacimarine sediment from rain-out of fine-grained debris in turbid meltwater. Beneath this facies is a semi-transparent deformation-till unit, which includes buried streamlined landforms. Landform distribution in the Uummannaq system is used to reconstruct past ice extent and flow directions. The presence of streamlined landforms (mega-scale glacial lineations, drumlins, crag-and-tails) shows that an ice stream advanced through the fjord system to fill Uummannaq Trough, reaching the shelf edge at the Last Glacial Maximum. Beyond the trough there is a major fan built mainly of glacigenic debris flows. Turbidity-current channels were not observed on Uummannaq Fan, contrasting with well-developed channels on Disko Fan, 300km to the south. Ice retreat had begun by 14.8cal.ka ago. Grounding-zone wedges (GZW) in Uummannaq Trough imply that retreat was episodic, punctuated by several still-stands. Ice retreat between GZWs may have been relatively rapid. There is little sedimentary evidence for still-stands in the inner fjords, except for a major moraine ridge marking a Little Ice Age maximum position. On the shallow banks either side of Uummannaq Trough, iceberg ploughing has reworked any morphological evidence of earlier ice-sheet activity. © 2013 The Authors.
Description: This is an Open Access article published by Elsevier and distributed under a Creative Commons Attribution Licence CC-BY 3.0 http://creativecommons.org/licenses/by/3.0/ which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Sponsor: This research was funded by UK Natural Environment Research Council [grant number NE/D001951/1].
Version: Published
DOI: 10.1016/j.quascirev.2013.09.007
URI: https://dspace.lboro.ac.uk/2134/17834
Publisher Link: http://dx.doi.org/10.1016/j.quascirev.2013.09.007
ISSN: 0277-3791
Appears in Collections:Published Articles (Geography and Environment)

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