CLEAVAGE NOT PARALLEL TO XY PLANE OF FSE

A material plane may fail to rotate parallel to the XY plane of fse. The material plane can be a planar fabric and since this has failed to rotate parallel to XY plane, shear may develop along it and dislocation can be observed. Only a small deviation is enough to cause substantial shear. The figure shows the plot of % shortening in e3 against the angle by which the material plane departs from XY plane. The fields of k=0, k=1 and k=infinity have very limited ranges. As the shortening increases, the material plane becomes more and more aligned close to XY plane. In weakly deformed rocks, this discrepancy is therefore much more than in strongly deformed ones. The shortening component reduces the disparity.