Page 59 - Microtectonics

3.9 · Competing Processes During Deformation 47

Fig. 3.31. Typical fabric of dynamically recrystallised quartz formed by subgrain rotation (SGR) recrystallisation. Grains have a weak shape-
preferred orientation that defines a continuous foliation. Granite mylonite. Qin Ling mountains, China. Width of view 1.8 mm. CPL

Fig. 3.32. Polycrystalline quartz with irregular grain boundaries formed in response to grain boundary migration (GBM) recrystallisation.
The light-grey central grain is bulging into the dark grain at lower right. Quartzite, Yilgarn Craton, Australia. Width of view 1.8 mm. CPL