Summary: Eas210

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• 1 Deformation of Rocks

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• How do rocks respond to differential stress? - At shallow depth and compressional 

  • It is a brittle deformation along faults where one rock mass thrust over the other
  • brittle fracture 

• How do rocks respond to differential stress?- At a deeper depth and compressional?

  • At a high value of confining stress 
    
  • It has a high temperature 
  • It will squeeze and fold the rock masses
  • Has a ductile flow

• How do rocks respond to differential stress?- at a shallow depth and shear

  • Causes an offset in the crustal blocks causing faults 
    
  • brittle fracture

• How do rocks respond to differential stress?- at a deep depth and shear

  • High temperature, shear stress distorts rock mass along shear zones
    
  • ductile flow

• What is produced by compressional stress?

  The crust shortening and thicken when there is compressional stress

• What happens at the shallow parts and the deeper parts of the crust when deformation occurs?

  • At shallow = it has a brittle deformation will break kind of like a stick
    
  • At deep = has a ductile flow deformation, you are able to bend it

• Which yield strength is greater than these two?yield strength of rock A = 10yield strength of rock B = 15

  The B has a greater yield strength

• Which deformation is created by compressional stress?

  1. Reverse Fault
     
  2. Thrust Fault
  3. Folded Rocks

• If a strike and a dip symbol were placed in the map of a structural, which way would the dips point?

  The dips will point down towards the centre

• A syncline were eroded to a flat surfaces, when you walk on it do you go from oldest to youngest? Or youngest to oldest?

  You would go from oldest (outer part) and youngest (inside)