DYNAMIC RECRYSTALLIZATION AND FABRIC DEVELOPMENT DURING THE SIMPLE SHEAR DEFORMATION OF ICE

In situ observations of polycrystalline ice deformed in simple shear between minus 10 and minus 1 degree C are presented. This study illustrates the processes responsible for deformation, development of a preferred crystallographic orientation and formation of a preferred dimensional orientation. It is argued that estimates of the strain magnitude made from orientation of elongate grains are unreliable in high temperature shear zones. These results are applicable to geological and glacial shear environments.