Table 1 Averaged molecular compositions (±one standard deviation) for fountain and repose gas on 5 May 2021 (15:20:44–17:43:07 UTC)
From: Near-surface magma flow instability drives cyclic lava fountaining at Fagradalsfjall, Iceland
Species abundance | Fountaining n = 1374 (mol %) | Repose n = 1111 (mol %) |
|---|---|---|
H2O | 89.8 ± 1.9 | 96.1 ± 1.5 |
CO2 | 7.8 ± 1.5 | 2.8 ± 1.3 |
SO2 | 2.3 ± 0.6 | 0.9 ± 0.3 |
HCl | 0.08 ± 0.07 | 0.17 ± 0.07 |
HF | 0.04 ± 0.009 | 0.06 ± 0.03 |
CO | 0.006 ± 0.004 | 0.010 ± 0.005 |
Species molecular ratios | (mol/mol) | (mol/mol) |
H2O/CO2 | 12.1 ± 3.0 | 41.9 ± 21.6 |
H2O/SO2 | 42.7 ± 11.1 | 120.5 ± 41.0 |
CO2/SO2 | 3.6 ± 0.9 | 3.35 ± 1.5 |
SO2/HCl | 33.0 ± 6.9 | 8.65 ± 2.9 |
HCl/HF | 1.7 ± 0.3 | 1.90 ± 0.2 |
CO2/CO | 1101 ± 371 | 310.4 ± 130 |
