CONJUGATE BRITTLE DUCTILE SHEAR ZONES

Note that in bothe the sets of brittle ductile shear zones, the late stage or tapering chords of sigmoidal extension veins point in the same direction, approx. towards top or bottom of the photograph and this direction is the direction of maximum shortening in the rock. The acute angle is about 80 degrees which again suggests that the response is transitional. The sigmoidality is not pronounced suggesting that the amount of shear strain is rather small.