Figur 14

Experimentally deformed quartz aggregates

Figure caption

Experimentally deformed quartz aggregates

starting materials / semi-brittle & regime 1 / regime 2 / regime 2 & 3 / annealing

14

BHQ shortened 60% at 800°C, 10-6/sec and 1200 MPa (regime 2 dislocation creep); then annealed at 900°C for 120 hrs.

BHQ shortened 60% at 800°C, 10-6/sec and 1200 MPa (regime 2) and then statically annealed at 900°C for 120 hours. The deformation microstructure has been completely replaced by strain-free polygonal recrystallized grains, but the pattern and the strength of the c-axis crystallographic preferred orientation has not changed. Compare this photo with #12, which shows a sample dynamically recrystallized at high temperature; in the annealed sample the grain boundaries are straighter, but both samples were quenched. Would differences be preserved and noticeable in naturally deformed (and possibly annealed) samples? (AN9)

		Experimentally deformed quartz aggregates
		Figure caption

	Experimentally deformed quartz aggregates	starting materials / semi-brittle & regime 1 / regime 2 / regime 2 & 3 / annealing


14		BHQ shortened 60% at 800°C, 10-6/sec and 1200 MPa (regime 2 dislocation creep); then annealed at 900°C for 120 hrs. BHQ shortened 60% at 800°C, 10-6/sec and 1200 MPa (regime 2) and then statically annealed at 900°C for 120 hours. The deformation microstructure has been completely replaced by strain-free polygonal recrystallized grains, but the pattern and the strength of the c-axis crystallographic preferred orientation has not changed. Compare this photo with #12, which shows a sample dynamically recrystallized at high temperature; in the annealed sample the grain boundaries are straighter, but both samples were quenched. Would differences be preserved and noticeable in naturally deformed (and possibly annealed) samples? (AN9)