Quartz crystals of these rocks have been dynamically recrystallized under moderate temperature (>500 C) conditions as represented by grain boundary migration (GBM) as well as recrsytallized feldspars.
Quartz crystals of theserocks have been dynamically recrystallized under moderatetemperature (>500 C) conditions as represented by grain boundarymigration (GBM) as well as recrsytallized feldspars.