10. Environments of Metamorphism Flashcards
1
Q
Describe the geological mechanism for changing Pressure
A
Changing thickness of overlying rock pile by:
- sedimentary burial
- tectonic burial e.g. overthrusting
- erosion
- crustal stretching
- diapiric uprise etc
Pressure changes are instantaneous
2
Q
Describe the geological mechanisms fro changing Temperature
A
Heat sources:
- radioactive decay
- conduction from interior
- hot magma
Change arrangement of heat sources by:
- intrusion of magma
- change thickness of overlying pile
3
Q
Why are T changes time-dependent?
A
rocks are not good heat conductors - transient geotherms
