% oxide | PM 5 Jun 635 km | B 4 Jun. 75 km | LA 5 Jun 40 km | LA Nov. 40 km |
SiO2 | 70.08 | 64.38 | 62.10 | 67.99 |
Al2O3 | 13.91 | 14.55 | 14.81 | 16.32 |
Na2O | 2.52 | 5.79 | 5.77 | 5.07 |
K2O | 2.19 | 2.47 | 2.31 | 1.61 |
CaO | 1.88 | 2.90 | 2.78 | 2.30 |
MgO | 1.04 | 1.30 | 2.37 | 2.27 |
FeO | 4.00 | 7.82 | 8.51 | 4.74 |
TiO2 | 0.56 | 0.65 | 0.70 | 0.70 |
SO3 | nd | 0.03 | 0.23 | nd |
Cl2O | nd | 0.11 | 0.42 | nd |
Ratio |
|
|
|
|
SiO2/Al2O3 | 5.03 | 4.42 | 4.19 | 4.17 |
SiO2/FeO | 17.52 | 8.23 | 7.29 | 14.34 |
SiO2/CaO | 37.27 | 22.20 | 22.42 | 29.56 |