Figure 30

Naturally deformed quartz-rich rocks

Figure caption

Naturally deformed quartz-rich rocks

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

30

Mica fish and oblique elongate recrystallized quartz grains in quartz mylonite, indicating dextral shear.

Mica fish in quartzite mylonite, Redbank shear zone, central Australia, deformed at greenschist conditions. Gypsum plate inserted shows strong crystallographic preferred orientation as well as oblique foliation of elongate recrystallized quartz grains consistent with the top-to-the-right (south) sense of shear inferred from mica fish. The section is perpendicular to foliation and parallel to lineation; most c-axes lie in the foliation and are normal to lineation (red-purple grains) and a few define a part of a cross-girdle (blue and yellow grains). (428 A)

		Naturally deformed quartz-rich rocks
		Figure caption

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


30		Mica fish and oblique elongate recrystallized quartz grains in quartz mylonite, indicating dextral shear. Mica fish in quartzite mylonite, Redbank shear zone, central Australia, deformed at greenschist conditions. Gypsum plate inserted shows strong crystallographic preferred orientation as well as oblique foliation of elongate recrystallized quartz grains consistent with the top-to-the-right (south) sense of shear inferred from mica fish. The section is perpendicular to foliation and parallel to lineation; most c-axes lie in the foliation and are normal to lineation (red-purple grains) and a few define a part of a cross-girdle (blue and yellow grains). (428 A)