Table 4 Groundmass chemical compositions and crystallinity for the representative samples from the Shinmoedake eruptions
Eruption | 28 Jan 2011 | 1 Feb 2011 | Mar 2018 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Sample name | 2011–020503 | 2011–0201-1 | SNM18_15 | SNM18_16 | SNM190305-2–3 | SNM18_17 | ||||
Sample type | Pumice | Lava | P1 | P2 | B | L | ||||
Bulk GM | Bulk GM | GM glass | Pl rim | GM glass | Pl rim | GM glass | Pl rim | GM glass | Pl rim | |
SiO2 | 60.87 | 63.94 | 68.57 | 53.26 | 69.83 | 53.77 | 72.63 | 53.25 | 76.02 | 54.35 |
TiO2 | 0.65 | 0.65 | 0.83 | 0.00 | 0.65 | 0.05 | 0.69 | 0.11 | 0.75 | 0.01 |
Al2O3 | 18.01 | 16.26 | 14.19 | 29.46 | 14.86 | 28.45 | 13.11 | 28.80 | 12.48 | 28.72 |
tFeO | 5.67 | 5.44 | 5.17 | 0.47 | 3.78 | 0.94 | 3.60 | 1.16 | 1.88 | 0.56 |
MnO | 0.12 | 0.12 | 0.11 | 0.00 | 0.09 | 0.01 | 0.07 | 0.02 | 0.05 | 0.01 |
MgO | 2.37 | 2.11 | 1.10 | 0.04 | 0.69 | 0.13 | 0.47 | 0.15 | 0.06 | 0.05 |
CaO | 7.10 | 5.72 | 3.68 | 12.71 | 3.58 | 12.54 | 2.40 | 13.08 | 1.01 | 11.75 |
Na2O | 3.19 | 3.24 | 2.94 | 3.76 | 3.06 | 3.75 | 3.06 | 2.75 | 2.84 | 4.23 |
K2O | 1.87 | 2.37 | 3.18 | 0.27 | 3.25 | 0.34 | 3.76 | 0.64 | 4.74 | 0.31 |
P2O5 | 0.16 | 0.16 | 0.12 | 0.00 | 0.11 | 0.00 | 0.12 | 0.00 | 0.09 | 0.00 |
n | 480 | 565 | 10 | 3 | 9 | 3 | 6 | 2 | 2 | 3 |
Crystallinity | 36.5 ± 8.6 | 38.8 ± 8.6 | 52.5 ± 8.0 | 59.2 ± 5.6 | ||||||