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Evolution of subglacial bedforms along a paleo-ice stream, Antarctic Peninsula continental shelf.

Ó Cofaigh, C. and Pudsey, C. J. and Dowdeswell, J. A. and Morris, P. (2002) 'Evolution of subglacial bedforms along a paleo-ice stream, Antarctic Peninsula continental shelf.', Geophysical research letters., 29 (8). p. 1199.

Abstract

Geophysical data from the Antarctic Peninsula continental shelf reveal streamlined subglacial bedforms in a cross-shelf trough. Bedforms exhibit progressive elongation with distance along the trough, and record flow of a paleo-ice stream from the Antarctic Peninsula Ice Sheet during the last glacial maximum. Downflow evolution of the bedforms indicates increasing flow velocities as the ice stream traversed the shelf. This, in turn, is related to a transition from crystalline bedrock on the inner shelf to a soft sedimentary substrate on the outer shelf. Although streaming flow operated across both substrates, the highest flow velocities occurred over the soft bed. Spatial variation in the inferred nature of fast-flow, from sliding to subglacial sediment deformation and/or ploughing, was also lithologically controlled. These data highlight the control of subglacial geology on ice-stream dynamics in the geological record and demonstrate a direct relationship between the formation of streamlined subglacial bedforms and paleo-ice streams.

Item Type:Article
Keywords:Marine Geology and Geophysics, Marine seismics, Hydrology, Glaciology, Information Related to Geographic Region, Antarctica.
Full text:PDF - Published Version (520Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1029/2001GL014488
Publisher statement:© 2002 American Geophysical Union. O'Cofaigh, C. and Pudsey, C. J. and Dowdeswell, J. A. and Morris, P., (2002), 'Evolution of subglacial bedforms along a paleo-ice stream, Antarctic Peninsula continental shelf.', Geophysical research letters., 29 (8), Article 1199, 10.1029/2001GL014488 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Record Created:06 Oct 2008
Last Modified:03 Aug 2011 16:20

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