Metamorphic Flashcards
(9 cards)
1
Q
two main distinguishing features of metamorphic rocks
A
- sequential solid state mineral growth in response to increasing metamorphic intensity or grade
- formation of planar fabrics in response to differential stress
2
Q
prograde reactions
A
3
Q
the barrovian sequence
A
a common sequence of metamorphic index minerals; chlorite, biotite, garnet, staurolite, kyanite, then sillimanite (all in the presence of muscovite, quartz, and plagioclase)
4
Q
porphyroblasts
A
distinct, coarse-grained crystals within a matrix of muscovite, chlorite, or biotite, quartz, and plagioclase
5
Q
inclusion trails
A
6
Q
leucosomes
A
light colored quartzfeldspathic layers
7
Q
melanosomes
A
dark colored biotite-rich layers
8
Q
migmatites
A
9
Q
A
