Ref: SPURR WHOLE ROCK SAMPLE (mean Ancestral Spurr from M.Coombs compilation, Apr2025. Estimated values in red)
input     value     unit
temperature    400  degC

SiO2     59.30 wt%
TiO2      0.80 wt%
Al2O3    17.48 wt%
FeOT      6.40 wt%
Fe2O3     1.56 wt%
FeO       4.99 wt%
MnO       0.13 wt%
MgO       3.55 wt%
CaO       6.88 wt%
Na2O      3.57 wt%
K2O       1.66 wt%
P2O5      0.21 wt%
Cl        300  ppm
S         400  ppm
F         200  ppm
CO2       10   ppm
Sr       540.3 ppm
Ba       552.9 ppm
Zn        77.2 ppm
Cu        31.0 ppm
Pb        5.5  ppm
___________________________________
SiO2     59.30 wt%
TiO2      0.80 wt%
Al2O3    17.48 wt%
Fe2O3     1.56 wt%
FeO       4.99 wt%
MnO       0.13 wt%
MgO       3.55 wt%
CaO       6.88 wt%
Na2O      3.57 wt%
K2O       1.66 wt%
P2O5      0.21 wt%
Cl     0.03000 wt%
S      0.04000 wt%
F      0.02000 wt%
CO2    0.00100 wt%
Sr     0.05403 wt%
Ba     0.05529 wt%
Zn     0.00772 wt%
Cu     0.00310 wt%
Pb     0.00055 wt%