Naturally deformed quartz-rich rocks
Figure caption
undeformed / semibrittle & bulging recrystallization / subgrain rotation recrystallization / grain boundary migration recrystallization
22
Mica-rich Heavitree quartzite showing grain boundary migration recrystallization; mica grains pin the boundaries of recrystallized quartz grains.
In this sample, the quartz recrystallized grain size is limited by mica grains pinning the grain boundaries; in mica-poor layers, the quartz recrystallized grain size is larger. Dislocation creep regime 3. (SI-11 A)