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TOPIC 2 ( PROTOLITH )
Topic 3 ( metamorphic process )
topic 4 ( types of metamorphism )
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topic 5 ( types of metamorphic rocks )
metamorphism > Metamorphic TOPIC 1 ( METAMORPHISM ) > TOPIC 2 ( PROTOLITH ) > Topic 3 ( metamorphic process ) > topic 4 ( types of metamorphism )
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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
Type of metamorphism -
Contact
/
thermal
Condition-
High
temperature
Occurrence- Occurs where
plutons
intrude
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
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