Deformation of rocks
- Created by: Brad_ers_B
- Created on: 28-04-15 20:03
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- Deformation of rocks
- Stress and strain
- Stress = Forces applied to a rock by Earth movements or the weight of overlying rocks
- Strain = describes the deformation caused by the applied forces
- Factors affecting stress and strain
- Higher temperature = more plastic rocks
- Fold and not fault even if rock is brittle at high temps
- Pressure (confining) and depth = Stronger rocks (difficult to deform)
- Time
- Pressure applied over short time period = Brittle rocks
- Pressure applied over long period of time = plastic deformation
- Higher temperature = more plastic rocks
- The relationship between forces and geological structures
- Tensional forces
- Result in fracturing and crustal extension
- Is displacement = Structure is a fault
- No displacement = Structure is a joint
- Compressive forces
- Result is fracture or folding, both result in shortening of the Earth's crust
- Cold = fracture and fault
- Warm = more likely to fold
- Shear forces
- Deformation in one place (Normally horizontal
- May result in faults or folds
- Tensional forces
- Stress and strain
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