8.1.4: Dynamic Metamorphism
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- 18598
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Metamorphism can also occur when rocks grind together, producing dynamic metamorphism, also called cataclastic metamorphism. This uncommon form of metamorphism, occurs because of shearing and deformation associated with faults and fault zones where rocks move past each other. The metamorphism produces fractured and granulated rocks that contain elongated mineral grains. Sometimes, but not often, new metamorphic minerals form. Figure 8.7 shows an outcrop where dynamic metamorphism has occurred along a meter-wide fault zone.