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1 Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
2 British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Fast-flowing ice streams and outlet glaciers currently account for as much as 90% of the discharge from the Antarctic and Greenland Ice Sheets. Although the deformation of subglacial material has been proposed as the mechanism for this rapid motion, such sediment is usually hidden under several kilometers of ice. Marine-geophysical records have allowed reconstruction of the three-dimensional thickness of the sedimentary bed beneath a large Antarctic paleo–ice stream for the first time. Fast flow is indicated by streamlined seafloor lineations that form the surface of a layer of low shear strength, unsorted sediment, averaging 4.6 m thick. Rapid motion of the paleo–ice stream was a result of subglacial deformation within this layer.
Key Words: paleo–ice streams • subglacial environment • deformation till • Antarctic Peninsula • Quaternary
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