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Summary Deformation

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Notes describing factors affecting rock behaviour, principal stress orientations of different types of faults, fault indicators, folding mechanisms, cleavage-bedding relationships, fault reactivation, and interpreting block diagrams and maps

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Institution
WJEC
Module
GL4 - Interpreting the Geological Record








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Study Level
A/AS Level
Examinator
WJEC
Subject
Geology
Unit
GL4 - Interpreting the Geological Record
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Uploaded on
September 1, 2020
Number of pages
4
Written in
2019/2020
Type
Summary

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Deformation
Deformation of Rock: Stress-Strain Recap
Stress – forces applied to a rock by Earth movements or the mass of overlying rock

Strain – a change in the shape or volume of a body as a result of applied stress

Factors that Affect a Rocks Behaviour

• Temperature – higher temperature makes the rock more plastic
• Time – slow = fold, fast = fracture
• Pressure – confining pressure – depth into crust
• Strength – composition determines whether it is competent or incompetent


Faults
Principal Stress Orientations Heave
Throw
Maximum Stress Pmax σ1
Intermediate Stress Pmin σ2
Minimum Stress Pint σ3


Normal Fault (Tensional Stress)


Pmax

Footwall Hanging Wall

Pmin →  Pmin Thrust Fault (Compressional Stress)

Pmin
  
Pint Pmax

 Pmax
Reverse Fault (Compressional Stress)
Pmax →

Pmin  
 Pint Pmin


Pmax →  Pmax Strike Slip Fault (Shear Stress)

Pmax Pmin
  

Pint
Pmin


SWAN – Synclines are Wider on the downthrown side
and Anticlines are Narrower 
Pmin 
 Pmax
Pint

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