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SUMMARY:Megafolding of englacial layers within the West Antarctic Ice Shee
 t - Neil Ross\, School of Geography\, Politics and Sociology\, Newcastle U
 niversity\, UK
DTSTART:20180321T140000Z
DTEND:20180321T150000Z
UID:TALK101191@talks.cam.ac.uk
CONTACT:Max Holloway
DESCRIPTION:Complex englacial structures identified within the East Antarc
 tic and Greenland ice sheets are thought to be generated by water freezing
  to the ice-sheet base\, evolving under ice flow. We use ice-penetrating r
 adar to identify and measure complex deep-ice facies in the Weddell Sea se
 ctor of West Antarctica\, revealing an extensive thick (>500 m) unit\, inc
 orporating several unusually highly-reflective\, heavily tectonised\, fold
 ed layers. Radar reflectivity of one layer within the unit is observed to 
 be far greater parallel to flow than orthogonal to it. Such selective engl
 acial anisotropy is most likely explained by an ice layer with a strong an
 d discrete preferred crystal fabric and\, consequently\, a different rheol
 ogy. Tectonism and folding associated with the deep-ice layer is a strikin
 g rheological response to laterally-convergent ice flow. Similar englacial
  structures\, and therefore rheological controls on ice flow\, will likely
  exist elsewhere in Antarctica and Greenland but current surveys are eithe
 r too localised\, or not optimised\, for imaging and characterising them. 
 The classic view of ice flow\, governed by a simple and uniform power-law\
 , will not produce such structures. For this reason\, the rheology of ice 
 in West Antarctica\, and mostly likely other ice masses\, should be consid
 ered far more complex than previously acknowledged.
LOCATION:British Antarctic Survey\, Innovation Centre\, Seminar Room 2
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