Structural Reactivation

• Earlier formed faults can be reactivated during larger tectonic events
• Folds can be refolded
• Fault Breccia


  Broken fragments of rocks either side of fault plane

  Fragments are large and angular and made of competent rock
• Fault Gouge


  Grinding of rock along fault plane produces fine grained particles

  Form due to high pressure and heat - typical thrust faults

  Ductile Deformation
• Slikensides


  Scratches fault surface

  The lineations produced show direction of movement

  Seen when a mineral is precipitated by a fluid that flowed along the fault plane

  Shows most recent movement