8. Metamorphism of Igneous Rocks Flashcards
1
Q
What is a metamophosed basic igneous rocks called?
A
Metabasite
2
Q
What six mineral groups occur mostly in metabasites?
A
Pyroxenes, Amphiboles, Olivine, Plagioclase feldspar, Epidote, Chlorite
3
Q
Which three minerals are included in the pyroxene group?
A
Cpx
Opx
Jd = jadeite (component of omphacite = high-P cpx)
4
Q
What three minerals are in the amphibole group?
A
Act = actinolite
Hbl = hornblende
Gln = glaucophane
5
Q
What is required for basic rocks to start to change during regional metamorphism?
A
water
the rocks are anhydrous so need hydration
6
Q
Describe subduction zone metamorphism
A
Low T, HIgh P
