GL4 E1 KI 3c

• Textural changes:– FOLIATED AND NON-FOLIATED

– See KI 3 b

Textural changes

• From random orientation to alignment

• Recrystallisation

MYLONITE

• Foliated• Shearing and dislocation processes

powder the rock and align it to the movement directions

• Often forms slickensides

MYLONITE

Folded myloniteCredit: British Geological Survey

Photomicrograph of mylonite (XPL)Credit: British Geological Survey

MIGMATITE

• Very coarse gneiss• Look similar to granite• Bands of quartz-feldspar granitic

material and mafic material (biotite and hornblende)

• Highest metamorphic grades• Partial melting• Plastic stage flow folds (ptygmatic

folds)