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Submarine glacial-landform distribution across the West Greenland margin: a fjord–shelf–slope transect through the Uummannaq system (70–71° N)

J. A. Dowdeswell, K. A. Hogan and C. Ó Cofaigh
Geological Society, London, Memoirs, 46, 453-460, 30 November 2016, https://doi.org/10.1144/M46.150
J. A. Dowdeswell
1Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
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K. A. Hogan
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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C. Ó Cofaigh
3Department of Geography, Durham University, Durham DH1 3LE, UK
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Today, the Greenland Ice Sheet reaches the sea via a number of fast-flowing outlet glaciers that are fed by ice draining from huge interior basins (Rignot & Kanagaratnam 2006). At the Last Glacial Maximum (LGM), the ice sheet expanded to reach the continental shelf break around much of Greenland (Ó Cofaigh et al. 2013a). In the Uummannaq area at c. 70–71° N (Fig. 1a) there is now a 400 km distance between the terminus of Rink Glacier, which drains about 30 000 km2 of the ice sheet, and the shelf edge. This provides a transect from the modern glacier front, through a deep fjord system and adjacent cross-shelf trough, to the continental slope in Baffin Bay. The seafloor is now exposed along this transect and the landforms produced by past glacial activity can be examined using marine-geophysical methods. Deglaciation from the LGM was underway at the shelf edge in Uummannaq Trough by 14.8 kyr ago and from the mid-shelf by 10.9 kyr, and ice had probably retreated back into the fjord system by 9.3 kyr ago (Ó Cofaigh et al. 2013a; Roberts et al. 2013).

Fig. 1.

Regional bathymetry and shelf architecture of the Uummannaq fjord–shelf–slope system, West Greenland. The location of subsequent figures is also shown. (a) Multibeam-bathymetric coverage of the Uummannaq system (located as a red box on the inset location map of Greenland). UI, Ubekendt Island; RF, Rink Fjord. Regional bathymetry from IBCAO v. 3.0. (b) Dip-line seismic-reflection profile (130 km long) showing West Greenland continental shelf architecture comprising prograding sedimentary units. (c) 110 km long strike profile showing a Late Quaternary glacial trough where erosion has truncated pre-existing reflectors (black arrows). The reflections marked bPP represent the lower boundary of Plio-Pleistocene erosion and glacier-influenced sediments; (b) and (c) are located in (a) …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Submarine glacial-landform distribution across the West Greenland margin: a fjord–shelf–slope transect through the Uummannaq system (70–71° N)

J. A. Dowdeswell, K. A. Hogan and C. Ó Cofaigh
Geological Society, London, Memoirs, 46, 453-460, 30 November 2016, https://doi.org/10.1144/M46.150
J. A. Dowdeswell
1Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
  • Find this author on Google Scholar
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  • For correspondence: jd16@cam.ac.uk
K. A. Hogan
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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C. Ó Cofaigh
3Department of Geography, Durham University, Durham DH1 3LE, UK
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Submarine glacial-landform distribution across the West Greenland margin: a fjord–shelf–slope transect through the Uummannaq system (70–71° N)

J. A. Dowdeswell, K. A. Hogan and C. Ó Cofaigh
Geological Society, London, Memoirs, 46, 453-460, 30 November 2016, https://doi.org/10.1144/M46.150
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