metaphoric rocks Flashcards
1
Q
Metamorphism is
A
Change in mineral shape + composition because of HIGH PRESSURE HIGH TEMP through REACTIONS and RECRYSTALLISATION
2
Q
Geothermal gradient
A
Temp increases by 10-40 C per 1 km
3
Q
Load pressure
A
Equal pressure in all directions
4
Q
Directed pressure
A
Flattens minerals and rocks
5
Q
CONTACT METAMORPHISM
A
Occurs when rocks are close to igneous intrusion
6
Q
What does contact metamorphism mean for the rocks
A
High temp => granular texture
7
Q
REGIONAL METAMORPHISM
A
Wide area with deeply burried rocks (>10km)
8
Q
What does regional metamorphism mean for rocks
A
High temp + high directed pressure => foliages (banded) rocks
