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Title: Study of ice fabrics, Thule Area, Greenland
Authors: Rigsby, George P.
Keywords: Glaciers
Moltke Glacier
Thule, Greenland
Ice crystals
Glacier ice
Shear stress
Publisher: U.S. Army Snow, Ice, and Permafrost Research Establishment.
Engineer Research and Development Center (U.S.)
Series/Report no.: SIPRE report ; 26.
Description: Technical Report
Abstract: Crystal fabric studies were made on glacier ice taken from 11 locations on the Nuna Ramp and three locations on the Moltke Glacier, Greenland. From samples taken near the surface of the glacier, 1/16-in. sections of ice were prepared, and the orientation of the optic axis of each ice crystal in the section was determined with a large universal stage with four axes of rotation, mounted between crossed polaroid sheets. The optic axes, when plotted on a Schmidt equal-area projection, often show very strong patterns with concentrations as high as 30% in 1% of the area. Ice appears to be very sensitive to shearing forces and the crystals in polar glaciers tend to become oriented so that the basal glide plane is parallel to the shear plane. The strength of the pattern appears to be more or less proportional to the strength of the shearing forces imposed on the ice. Strong shearing forces seem to produce small crystals with strong preferred orientations, while high temperatures tend to produce larger crystals.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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