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Exploring Textural Changes in Foliated and Non-Foliated Rocks

Learn about the transformation from random orientation to alignment in rocks such as mylonite and migmaitite. Understand the shearing and dislocation processes that shape these distinctive textures in geology. Images credit: British Geological Survey.

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Exploring Textural Changes in Foliated and Non-Foliated Rocks

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  1. GL4 E1 KI 3c • Textural changes: • FOLIATED AND NON-FOLIATED • See KI 3 b

  2. Textural changes • From random orientation to alignment • Recrystallisation

  3. MYLONITE • Foliated • Shearing and dislocation processes powder the rock and align it to the movement directions • Often forms slickensides

  4. MYLONITE Folded mylonite Credit: British Geological Survey Photomicrograph of mylonite (XPL) Credit: British Geological Survey

  5. 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)

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