Figure 16

Naturally deformed quartz-rich rocks

Figure caption

Naturally deformed quartz-rich rocks

undeformed / semibrittle & bulging recrystallization / subgrain rotation recrystallization / grain boundary migration recrystallization

16

Bulging recrystallization of quartz vein, Eastern Tonale line.

Sample is from the mylonitic fault zone; deformation conditions are approximately 340°C, 200-300 MPa. Quartz grains show undulose and patchy extinction; the grain boundaries are clearly serrated indicating bulging recrystallization. The recrystallized new grains at the rims of the porphyroclasts occur more extensively at triple junctions and along grain boundaries that are oriented at high angles to the foliation. Apparent flattening and stretching of porphyroclasts is partly due to initially elongated shape of quartz fibres. Larger irregular subgrains are probably not synkinematic. (MS26-2)

		Naturally deformed quartz-rich rocks
		Figure caption

	Naturally deformed quartz-rich rocks	undeformed / semibrittle & bulging recrystallization / subgrain rotation recrystallization / grain boundary migration recrystallization


16		Bulging recrystallization of quartz vein, Eastern Tonale line. Sample is from the mylonitic fault zone; deformation conditions are approximately 340°C, 200-300 MPa. Quartz grains show undulose and patchy extinction; the grain boundaries are clearly serrated indicating bulging recrystallization. The recrystallized new grains at the rims of the porphyroclasts occur more extensively at triple junctions and along grain boundaries that are oriented at high angles to the foliation. Apparent flattening and stretching of porphyroclasts is partly due to initially elongated shape of quartz fibres. Larger irregular subgrains are probably not synkinematic. (MS26-2)