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Deformation mechanisms (Deformation mechanism maps (Rely on (Grain Size…

- - - - deformation by dislocation glide
    - - Recovery
      - Recrystalization
    - - Mean grain size
        
        Grain size piezometer relies on
        
        Microstructural record must atribute to a certain stage of rocks history
        
        Steady state DC must be achieved
        
        Microstructural record must not be modified during subsequent history, ie: grain growth, recovery...
      - Constant mean grain shape
      - CPO
        
        CPO can also be enhanced by eg.micas & can inherit CPO from replaced host
      - Constant free dislocation density
- - - - Presence of fluids
      - phase boundaries
      - Low Temp.
- - - - Dislocation climb, requires elevated Temp.
      - Subgrains are indication
      - Polygonization of UE
      - If LAGB are II, referred to as deformation bands
      - < 5-15°
      - New dislocations migrate into LAGB #
      - Forms by rearranging of dislocations into low energy configuration
    - - '> 5-15°
      - Boundaries end memebrs
        
        Tilt
        
        Twist
      - Driven by reduction in dislocation density
      - Migration then occurs: Sutured - SIGBM
      - Boundaries move to areas of higher dislocation densities
      - Formation of new grains
        
        Subgrain rotation / rotation recrytalization
        
        Grains same size
        
        CPO
        
        SGR + Fracturing #
        
        Bulging
        
        Nucleation & growth
        
        Very high dislocation
        
        Small recrystalizations along larger old deformed grains