Computer Science
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.214..369m&link_type=abstract
Earth and Planetary Science Letters, Volume 214, Issue 1-2, p. 369-378.
Computer Science
3
Ice, Ice Sheets, Creep, Deformation Inhomogeneities, X-Ray Diffraction
Scientific paper
Hard X-ray diffraction experiments have been carried out on ice monocrystals taken from the 3623 m long Vostok core (Antarctica). Strain gradients associated with the storage of geometrically necessary dislocations appear to be a general feature of the deformation microstructure of ice. The observed lattice distortion is related to the bending of the basal plane and the torsion of the lattice around the c-axis. The lattice distortion is shown to be compatible with the basal dislocations generally observed in ice crystals, supporting the assumption of deformation modes governed by basal slip and accommodated by recrystallization processes. The dependence of the ice viscosity on grain size in ice sheets appears to be compatible with these accommodation modes.
Bastie Pierre
Duval Paul
Hamelin Bernard
Lipenkov Volodya Ya.
Montagnat Maurine
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