Igneous Rocks Flashcards
1
Q
extrusive igneous characteristics
A
- cooled on surface
- mineral crystals often not visible (aphanitic)
2
Q
phaneritic
A
visible crystals
3
Q
aphanitic
A
no visible crystals
4
Q
porphyritic
A
mix of phaneritic and aphanitic
5
Q
pyroclastic
A
made from volcanic ash
6
Q
mafic rocks example
A
melt at high temperatures (mantle)
eg. Ca-rich plagioclase
7
Q
intermediate rocks example
A
medium temp melting (oceanic crust)
eg. amphibole
8
Q
felsic rock exampple
A
low heat melting
eg. quartz, muscovite
9
Q
dike
A
magma intrusions that cut across layers
10
Q
sill
A
magma intrusions that cross between layers
11
Q
laccolisth
A
parallel to layers
12
Q
batholiths
A
large magma intrusions
