gl4 e1 ki 3c
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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)