Figure 95

Deformation and metamorphic reactions in polyphase rocks

Figure caption

Deformation and metamorphic reactions

granodiorites / anorthosites

95

Mylonite derived from granodiorite at low to mid greenschist conditions; reaction plus deformation produced a weak fine-grained mixed phase matrix.

Mylonite derived from granodiorite. The matrix consists of fine-grained albite + epidote + quartz. Most of the deformation has been accommodated by this phase mixture. Quartz porphyroclasts embedded in this matrix show incipient dynamic recrystallization, with a grain size larger than the grain size of the phase mixture. TEM shows no dislocations in the highly strained fine grained phase mixture; thus the dominant deformation mechanism is inferred to be grain boundary sliding and diffusion creep.

		Deformation and metamorphic reactions in polyphase rocks
		Figure caption

	Deformation and metamorphic reactions	granodiorites / anorthosites


95		Mylonite derived from granodiorite at low to mid greenschist conditions; reaction plus deformation produced a weak fine-grained mixed phase matrix. Mylonite derived from granodiorite. The matrix consists of fine-grained albite + epidote + quartz. Most of the deformation has been accommodated by this phase mixture. Quartz porphyroclasts embedded in this matrix show incipient dynamic recrystallization, with a grain size larger than the grain size of the phase mixture. TEM shows no dislocations in the highly strained fine grained phase mixture; thus the dominant deformation mechanism is inferred to be grain boundary sliding and diffusion creep.