How do cataclasites differ from mylonites? Where are these rocks found (be specific)?

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  • How do cataclasites differ from mylonites? Where are these rocks found (be specific)?


Answer #1 | 08/02 2014 12:43
Cataclasites are formed by brittle deformation of rocks - i.e the parent rock is basically crushed. Mylonites are formed by ductile deformation. The original crystals in the parent rock are stretched and distorted causing them to recrystallise in to smaller, strain free crystals. Mylonites are are crystalline an cohesive. Cataclasites are fragmental and can be either cohesive or not. Both cataclasites and mylonites form along zones of intense deformation. The former forms where such zones are above the brittle-ductile transition (i.e. faults) whereas the latter occur below the brittle-ductile transition in ductile shear zones. The brittle-ductile transition typically occurs at about 15 km depth in continental crust. Rocks around the brittle-ductile transition can show both mylonitic and cataclastic characteristics.
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