Fig. 11

Crystallographic preferred orientation (CPO) and microstructure of quartz in sheared quartz veins from the Vals-Scaradra Shear Zone. Textures from the western part show a combination of sinistral shearing and coaxial flattening strain (particularly JK47, JK61, VF41). Photomicrograph of VF41 from the Darlun Zone shows evidence for post-kinematic annealing. The pole figures from the eastern part (V6 and V7) represent strong textures with dextral simple shear component and only minor indication of flattening. V14 from the middle of the shear zone shows flattening without a clear simple-shear component. Textures obtained by X-ray diffraction or time-of-flight neutron diffractometer and plotted in lower-hemisphere, equal-area projection. The trace of the foliation is in pole figures along the “equator” and the stretching lineation (X-direction of strain) within the foliation at the periphery, so that the Z-direction is at the upper and lower vertical extremities, and Y is in the middle. Thin sections (with crossed polarizers) on the right correspond with quartz pole figures on the left. Sections are orientated parallel to stretching lineation. Sample coordinates according to Swiss kilometric grid (CH1903/LV03)