SUPPLEMENTARY INFORMATION-­‐TABLE 1, COEXISTING FELDSPAR COMPOSITIONS AND DERIVED TEMPERATURES

AlkaliFeldsparCompositions(wt %)

sample
kfs 1 / location
core / SiO2
64.18 / TiO2
0.05 / Al2O3
18.79 / FeO(t)
0.07 / MnO
0.00 / MgO
0.00 / CaO
0.14
kfs 2 / core / 62.45 / 0.26 / 18.96 / 0.08 / 0.00 / 0.00 / 0.11
kfs 1 / rim / 64.18 / 0.05 / 18.79 / 0.07 / 0.00 / 0.00 / 0.14
kfs 2 / rim / 62.45 / 0.26 / 18.96 / 0.08 / 0.00 / 0.00 / 0.11
PlagioclaseCompositions(wt %)
SiO2 / TiO2 / Al2O3 / FeO(t) / MnO / MgO / CaO
high An / core / 52.53 / 0.35 / 29.33 / 0.17 / 0.00 / 0.00 / 11.19
high An / core / 52.53 / 0.35 / 29.33 / 0.17 / 0.00 / 0.00 / 11.19
low An / rim / 58.54 / 0.34 / 25.60 / 0.13 / 0.00 / 0.00 / 6.99
low An / rim / 58.54 / 0.34 / 25.60 / 0.13 / 0.00 / 0.00 / 6.99

Two-­‐Feldspar TemperaturesoC at 0.1 Gpa (Putirka,2008)

Global regression
Eqn 27aEqn 27b (42 Experiments) / CalculatedFeldsparComponents
AlkaliFeldspar
T(oC)T(oC)T(oC) / AnAb Or
870 755 780 / 0.007 0.175 0.817
840 735 755 / 0.005 0.175 0.819
T used in P calc / 790 695 700 / 0.007 0.175 0.817
760 680 680 / 0.005 0.175 0.819

*Wavelength-­‐dispersive analysis was performed using an accelerationvoltage of 15 keV and a beam currentof 20 n

To minimizevolatilizationof alkalis,plagioclaseand amphibolewere analyzed using a defocusedbeam (ca.5m m). Natural and syntheticsilicate,oxide,and pure metal standards were used.

FROM THE SOUTHERN MT RICHTHOFEN STOCK*

Na2O
1.98 / K2O
14.01 / Cr2O3
0.00 / total
99.22
1.93 / 13.72 / 0.00 / 97.52
1.98 / 14.01 / 0.00 / 99.22
1.93 / 13.72 / 0.00 / 97.52
Na2O
4.97 / K2O
0.19 / Cr2O3
0.00 / total
98.74
4.97 / 0.19 / 0.00 / 98.74
7.40 / 0.31 / 0.00 / 99.31
7.40 / 0.31 / 0.00 / 99.31

PlagioclaseFeldspar

AnAbOr

0.548 0.4400.011

0.548 0.4400.011

0.336 0.6450.017

0.336 0.6450.017