Figure 54

Naturally deformed feldspar aggregates

Figure caption

Naturally deformed feldspar rocks

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

54

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

Higher magnification view of sample shown in photo #52, illustrating mylonitic anorthosite. Most of the plagioclase is dynamically recrystallized and only small remnants are left of former porphyroclasts. Porphyroclasts oriented for easy slip have been reduced in thickness to the diameter of a single recrystallized grain (15-80 µm) by slip and recrystallization. Porphyroclasts with small aspect ratios have a markedly different crystallographic orientation, unsuitable for (010)[001] slip.

		Naturally deformed feldspar aggregates
		Figure caption

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


54		Detail of anorthosite strongly deformed and largely recrystallized at ~700°C and 900 MPa; regime 2 dislocation creep. Higher magnification view of sample shown in photo #52, illustrating mylonitic anorthosite. Most of the plagioclase is dynamically recrystallized and only small remnants are left of former porphyroclasts. Porphyroclasts oriented for easy slip have been reduced in thickness to the diameter of a single recrystallized grain (15-80 µm) by slip and recrystallization. Porphyroclasts with small aspect ratios have a markedly different crystallographic orientation, unsuitable for (010)[001] slip.