Naturally deformed quartzo-feldspathic rocks
Figure caption
weak deformation (Mulwaree) / strong deformation (Mulwaree) / mylonites (Redbank) / ultramylonites (Redbank)
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Quartzo-feldspathic mylonite developed at greenschist conditions; feldspar deformed by regime 1 dislocation creep, quartz by regime 2 dislocation creep.
Quartzo-feldspathic mylonite from the Redbank shear zone, showing the layering of quartz ribbons (regime 2 dislocation creep) and of small recrystallized or neo-mineralized feldspar grains. The new feldspar grains are concentrated in the pressure shadows of large porphyroclasts and strung out to form the mylonitic foliation. (495-10A)