2014/06/24 by Toshiya Mori, Masanori Sato, Y. Shimoike +1 · 2 citations
Chemistry · Earth and Planetary Sciences · Environmental Science · #Astrobiology #Atmospheric Ozone and Climate #Atmospheric and Environmental Gas Dynamics #Atmospheric sciences #Chemistry #Flux (metallurgy) #Fumarole #Geochemistry #Geology #Impact crater #Meteorology #Methane Hydrates and Related Phenomena #Mineralogy #Physics #Plume #Volcanic Gases #Volcano
paper · pdf · doi:10.1186/bf03353024
openalex publication_date 2014/06/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23
Remote FT-IR measurements of volcanic plume of Mt. Iwodake, Satsuma-Iwojima volcano, Japan, were carried out in October 1996 to understand plume chemistry of the volcano, especially characteristics of fluorine-bearing species in the plume. The SO 2 /HCl molar ratio in the plume was about 4, that is larger than the ratio in high-temperature gases. The high content of SO 2 is suggested to be caused by sulfur combustion in the crater. An average SiF 4 /HF molar ratio of 0.57 was observed for the plume, which is about one order of magnitude higher than the previously reported ratio. The result shows that SiF 4 is an important species and has similar to even larger contribution for fluorine output from Satsuma-Iwojima volcano than HF. The SiF 4 flux of Satsuma-Iwojima volcano is about 13 t/d, that is the largest SiF 4 flux from volcanoes in the world. The observed SiF 4 /HF ratio cannot be explained only by the high-temperature fumarolic composition of the volcano according to the thermodynamic calculations. The ratio can be explained if contribution of F-rich low-temperature fumaroles to the total gas flux of the volcano is as high as 40%.