Dynamic recrystallization of quartzite along deformation gradient

4.7

ORIENTATION IMAGES OF EXPERIMENTALLY DEFORMED ROCKS

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Dynamic recrystallization of quartzite along deformation gradient

Experimentally deformed Black Hills quartzite. Deformation occurred in the transition region between regime 2 and regime 3 dislocation creep (Hirth & Tullis, 1992).
Experimental conditions:

pc = 1.5 GPa

T = 900°C

strain rate = 10-6 s-1

0.16wt% water added

The total shortening of sample CQ78 (A.B.C) and sample CQ82(D) is 36% and 57% respectively. However, the deformation intensity increases from sample site A to C.
Note also, how the bulk c-axis pole figure changes, from near random (starting material) in A to a small circle distribution with discrete maxima in C and D (80-90% recrystallized).

Left, from top to bottom:
- CQ78, site A, B, C
- CQ82, site D
Below:
axial sections of sample CQ78 and CQ82, image sites indicated

4.7	ORIENTATION IMAGES OF EXPERIMENTALLY DEFORMED ROCKS
	top / contents / section 4 / pages -- 4.1 -- 4.2 -- 4.3 -- 4.4 -- 4.5 -- 4.6 -- 4.7

		Dynamic recrystallization of quartzite along deformation gradient
		Experimentally deformed Black Hills quartzite. Deformation occurred in the transition region between regime 2 and regime 3 dislocation creep (Hirth & Tullis, 1992). Experimental conditions: pc = 1.5 GPa T = 900°C strain rate = 10-6 s-1 0.16wt% water added The total shortening of sample CQ78 (A.B.C) and sample CQ82(D) is 36% and 57% respectively. However, the deformation intensity increases from sample site A to C. Note also, how the bulk c-axis pole figure changes, from near random (starting material) in A to a small circle distribution with discrete maxima in C and D (80-90% recrystallized). Left, from top to bottom: - CQ78, site A, B, C - CQ82, site D Below: axial sections of sample CQ78 and CQ82, image sites indicated