Table 1. Major-element compositions (normalised to 100 wt%) of glass shards and/or micropumices from the investigated FIC-12.9 tephra.
SiO2 | 54.82 | 54.83 | 54.88 | 54.10 | 54.93 | 54.83 | 55.37 | 53.89 | 60.47 | 58.03 | 60.10 |
TiO2 | 0.61 | 0.61 | 0.64 | 0.63 | 0.59 | 0.66 | 0.59 | 0.65 | 0.40 | 0.50 | 0.55 |
Al2O3 | 19.16 | 19.36 | 19.43 | 19.28 | 19.34 | 19.49 | 19.54 | 20.62 | 19.07 | 19.06 | 19.46 |
FeO | 5.03 | 5.24 | 4.79 | 5.05 | 4.69 | 5.14 | 4.49 | 4.82 | 2.78 | 3.91 | 3.08 |
MnO | 0.23 | 0.24 | 0.19 | 0.22 | 0.16 | 0.13 | 0.21 | 0.23 | 0.24 | 0.10 | 0.10 |
MgO | 1.44 | 1.48 | 1.44 | 1.50 | 1.30 | 1.39 | 1.22 | 1.41 | 0.38 | 0.80 | 0.38 |
CaO | 5.66 | 5.73 | 5.84 | 5.81 | 5.67 | 5.83 | 5.15 | 5.72 | 2.69 | 4.09 | 2.99 |
Na2O | 4.37 | 4.62 | 4.59 | 3.85 | 4.69 | 4.62 | 4.98 | 4.69 | 3.44 | 3.21 | 3.83 |
K2O | 8.40 | 7.65 | 7.98 | 9.32 | 8.40 | 7.71 | 8.19 | 7.71 | 10.51 | 10.14 | 9.48 |
P2O5 | 0.30 | 0.24 | 0.23 | 0.24 | 0.22 | 0.21 | 0.25 | 0.26 | 0.03 | 0.17 | 0.04 |
F | 0.52 | 0.55 | 0.35 | 0.40 | 0.50 | 0.35 | 0.37 | 0.37 | 0.35 | 0.13 | 0.36 |
Cl | 0.10 | 0.12 | 0.13 | 0.09 | 0.10 | 0.09 | 0.14 | 0.10 | 0.11 | 0.08 | 0.14 |
SO3 | 0.32 | 0.39 | 0.32 | 0.29 | 0.45 | 0.30 | 0.52 | 0.26 | 0.09 | 0.18 | 0.14 |
Analytic Tot. | 97.98 | 96.23 | 98.36 | 98.63 | 97.53 | 98.07 | 96.56 | 94.29 | 98.36 | 93.76 | 94.34 |
SiO2 | 54.72 | 57.53 | 55.01 | 54.89 | 55.01 | 55.61 | 54.73 | 54.53 | 53.82 | 54.58 | 54.85 |
TiO2 | 0.70 | 0.52 | 0.59 | 0.64 | 0.65 | 0.66 | 0.76 | 0.75 | 0.67 | 0.73 | 0.73 |
Al2O3 | 19.09 | 20.14 | 19.44 | 19.33 | 19.60 | 19.17 | 19.17 | 19.49 | 19.14 | 19.31 | 19.30 |
FeO | 5.20 | 3.58 | 4.80 | 4.99 | 5.18 | 5.22 | 5.62 | 5.21 | 5.29 | 5.39 | 4.95 |
MnO | 0.18 | 0.14 | 0.22 | 0.14 | 0.15 | 0.18 | 0.23 | 0.23 | 0.26 | 0.18 | 0.21 |
MgO | 1.60 | 0.73 | 1.37 | 1.34 | 1.46 | 1.48 | 1.49 | 1.59 | 1.48 | 1.50 | 1.46 |
CaO | 5.92 | 3.74 | 5.53 | 5.44 | 6.00 | 6.14 | 6.36 | 5.61 | 5.98 | 5.91 | 5.64 |
Na2O | 4.68 | 3.44 | 4.38 | 4.74 | 3.76 | 4.80 | 5.13 | 4.83 | 4.76 | 4.42 | 4.57 |
K2O | 7.59 | 10.02 | 8.44 | 8.26 | 7.97 | 6.46 | 6.21 | 7.43 | 8.31 | 7.75 | 8.03 |
P2O5 | 0.33 | 0.15 | 0.22 | 0.23 | 0.22 | 0.29 | 0.30 | 0.34 | 0.29 | 0.21 | 0.26 |
F | 0.35 | 0.45 | 0.47 | 0.46 | 0.40 | 0.36 | 0.62 | 0.65 | 0.45 | 0.47 | 0.44 |
Cl | 0.10 | 0.10 | 0.10 | 0.14 | 0.11 | 0.09 | 0.12 | 0.10 | 0.14 | 0.13 | 0.11 |
SO3 | 0.33 | 0.15 | 0.44 | 0.32 | 0.35 | 0.38 | 0.29 | 0.26 | 0.38 | 0.44 | 0.22 |
Analytic Tot. | 94.50 | 93.84 | 96.21 | 97.33 | 96.81 | 97.04 | 98.30 | 98.93 | 92.99 | 95.94 | 97.17 |