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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

From: Magma ascent and degassing processes of the 2011 and 2017–18 eruptions of Shinmoedake in Kirishima volcano group, Japan, based on petrological characteristics and volatile content of magmas

Fig. 7

Volatile and SiO2 contents in melt inclusions and groundmasses: a Sulfur vs. SiO2 contents; b Cl vs. SiO2 contents; c H2O vs. SiO2 contents; and d CO2 vs. SiO2 contents. H2O and CO2 contents of the melt inclusions were measured by SIMS and the S and Cl contents by EPMA, except for the small symbols in c, which indicate that the H2O content was measured by EPMA (shown in Additional file 5). Analytical errors for H2O and CO2 by SIMS are ± 0.2 wt% and ± 0.0028 wt%, respectively (Saito et al. 2010). Analytical errors for H2O, S, and Cl by EPMA are ± 1 wt%, ± 0.007 wt%, and ± 0.004 wt%, respectively (Saito et al. 2018). H2O, CO2, and SiO2 contents of melts (M1 and M2 magmas at pressure ranges of 50–500 MPa and F1, F2, A1, A2, B1, and B2 magmas at pressure ranges of 50–200 MPa) calculated using the MELTS program (Additional file 9) are also shown. Gray lines with circles indicate mixing of mafic and felsic melts in the 2011 magma (Table 4). Red lines with circles indicate mixing of mafic and felsic melts in the 2018 magma (Table 4). Blue and red curves with arrows show the compositional changes in melts that are expected from a decrease in the pressures of the 2011 mafic magma and 2018 magma, respectively

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