Chemistry Reference
In-Depth Information
Figure 1.9
Approximate location of metamorphic facies and of some important reactions
in the PT diagram.
1 analcime
+
quartz (low temperature)
=
albite
+
H
2
O (higher temperature)
2 laumontite
+
2 quartz
+
H
2
O (low pressure)
=
lawsonite (high pressure)
2' upper limit of stability of lawsonite that is replaced at higher temperature by epidote
3 calcite (low pressure)
=
aragonite (high pressure)
4 albite (low pressure)
=
jadeite
+
quartz (high pressure)
5 andalusite (low pressure)
=
kyanite (high pressure)
6 andalusite (low temperature)
=
sillimanite (high temperature)
7 kyanite (low temperature)
=
sillimanite (high temperature)
8 muscovite
+
quartz (low temperature)
=
potassium feldspar
+
silicate of alumina
+
H
2
O (high
temperature)
9 solidus of granitic rock (water saturated)
10 solidus of an olivine tholeiite à (water saturated)
