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Sökning: WFRF:(Enzmann Frieder)

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  • Wilson, Christopher J.L., et al. (författare)
  • Partial melting in polycrystalline ice: pathways identified in 3D neutron tomographic images
  • 2024
  • Ingår i: Cryosphere. - 1994-0416 .- 1994-0424. ; 18:2, s. 819-836
  • Tidskriftsartikel (refereegranskat)abstract
    • In frozen cylinders composed of deuterium ice (Tm+3.8C) and 10% water ice (Tm0C), it is possible to track melt pathways produced by increasing the temperature during deformation. Raising the temperature to +2C produces water (H2O) which combines with the D2O ice to form mixtures of HDO. As a consequence of deformation, HDO and H2O meltwater are expelled along conjugate shear bands and as compactional melt segregations. Melt segregations are also associated with high-porosity networks related to the location of transient reaction fronts where the passage of melt-enriched fluids is controlled by the localized ductile yielding and lowering of the effective viscosity. Accompanying the softening, the meltwater also changes and weakens the crystallographic fabric development of the ice. Our observations suggest meltwater-enriched compaction and shear band initiation provide instabilities and the driving force for an enhancement of permeability in terrestrial ice sheets and glaciers.
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