Fo
Liquid
En
SiO2
Forsterite + Enstatite
Enstatite + Silica
Enstatite + Liquid
Forsterite +
Liquid
P = 1 atm
Y
1. Cool Y to liquidus;
2.
Removal of Fo causes L to change
composition
3. L
reaches peritectic, P; Fo reacts
with L to form En
P
E
4. Fo is consumed in
reaction
5. En
crystallizes as L moves to eutectic
composition, E
6. En +
silica crystallize at eutectic until
L is consumed
7. Crystalline En + silica cool
Fo crystallizes