topic 4 ( types of metamorphism )

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Cards (85)

  • Impact (Shock) Metamorphism
    Metamorphism generated by meteorite impacts or explosive volcanic eruptions. Produces breccia, shocked quartz lamellae, Pseudotachylites, and UHP/UHT minerals; Impactites
  • Dynamic Metamorphism
    High-strain rate metamorphism produced by non-uniform stress in fault and shear zones. 
    In low P-T (low depth), it produces Cataclasites. 
    At 5-10km, it produces Pseudotachylites
    At 10-15km, it produces Mylonites.
  • Contact Metamorphism
    Local metamorphism around magmatic intrusion, typically producing an Aureole in the contact area between the intrusion and country rock. 
    Produces non-foliated metamorphic rocks such as Hornfels, Metaquartzite, and Skarns. 
  • Ocean Floor Metamorphism
    Hydrothermal alteration (Metasomatism) at ocean spreading ridges resulting to alunitic, propylitic, Sericitic, silicification, carbonatization, serpentinization and Spilitization.
  • Burial (Static) Metamorphism
    Increase in lithostatic stress by deep burial results in diagenetic processes (150oC – 350oC)
  • Dynamothermal Metamorphism
    Regional metamorphism induced by increased temperature-pressure. It is the most aerially extensive metamorphism type. 
  •  
    Type of metamorphism -Regional/ dynamothermal
    Condition- High pressure, high temperature, compression and shearing
    Occurrence - Occurs along convergent plate boundaries
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    Type of metamorphism - Contact/ thermal
    Condition- High temperature
    Occurrence- Occurs where plutons intrude
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    Type of metamorphism- Seafloor
    Condition- Metasomatism involved
    Occurrence- Occurs in mid-ocean ridges and igneous intrusions in continents
  • Burial
    • condition is increasing pressure, temperature, and depth 
    • occurence is any
  • Shock
    condition is Meteorite impact producing heat and shock wave
    occurence is any
  • Dynamic
    • condition is No temperature or pressure involved, only shearing
    • occurence May be near the surface (fragmented) or at great depths (plastic)
  • this is what it looks like
  • this is what it looks like
  • this is what it looks like