GL4 E1 KI 3c
5
GL4 E1 KI 3c • Textural changes: – FOLIATED AND NON-FOLIATED – See KI 3 b
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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 Presentation
Transcript of GL4 E1 KI 3c
![Page 1: GL4 E1 KI 3c](https://reader036.fdocuments.us/reader036/viewer/2022082818/56812f2b550346895d94bd88/html5/thumbnails/1.jpg)
GL4 E1 KI 3c
• Textural changes:– FOLIATED AND NON-FOLIATED
– See KI 3 b
![Page 2: GL4 E1 KI 3c](https://reader036.fdocuments.us/reader036/viewer/2022082818/56812f2b550346895d94bd88/html5/thumbnails/2.jpg)
Textural changes
• From random orientation to alignment
• Recrystallisation
![Page 3: GL4 E1 KI 3c](https://reader036.fdocuments.us/reader036/viewer/2022082818/56812f2b550346895d94bd88/html5/thumbnails/3.jpg)
MYLONITE
• Foliated• Shearing and dislocation processes
powder the rock and align it to the movement directions
• Often forms slickensides
![Page 4: GL4 E1 KI 3c](https://reader036.fdocuments.us/reader036/viewer/2022082818/56812f2b550346895d94bd88/html5/thumbnails/4.jpg)
MYLONITE
Folded myloniteCredit: British Geological Survey
Photomicrograph of mylonite (XPL)Credit: British Geological Survey
![Page 5: GL4 E1 KI 3c](https://reader036.fdocuments.us/reader036/viewer/2022082818/56812f2b550346895d94bd88/html5/thumbnails/5.jpg)
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)