Figure 53

Naturally deformed feldspar aggregates

Figure caption

Naturally deformed feldspar rocks

regime 1 / regime 2 low deformation / regime 2 moderate-high deformation

53

Detail of anorthosite strongly deformed and substantially recrystallized at ~700°C and 900 MPa; regime 2 dislocation creep.

Higher magnification view of sample shown in photo #52, illustrating segmentation of elongated plagioclase porphyroclasts by dynamic recrystallization. Bands of recrystallized grains develop parallel to the long axes of porphyroclasts, perhaps along slip planes with higher dislocation densities, and may lead to their segmentation into narrow slivers. Thus, the aspect ratios of such slivers cannot be used to infer the total elongation of porphyroclasts.

		Naturally deformed feldspar aggregates
		Figure caption

	Naturally deformed feldspar rocks	regime 1 / regime 2 low deformation / regime 2 moderate-high deformation


53		Detail of anorthosite strongly deformed and substantially recrystallized at ~700°C and 900 MPa; regime 2 dislocation creep. Higher magnification view of sample shown in photo #52, illustrating segmentation of elongated plagioclase porphyroclasts by dynamic recrystallization. Bands of recrystallized grains develop parallel to the long axes of porphyroclasts, perhaps along slip planes with higher dislocation densities, and may lead to their segmentation into narrow slivers. Thus, the aspect ratios of such slivers cannot be used to infer the total elongation of porphyroclasts.