Geochemistry of volcanic gases and hot springs of Satsuma-Iwojima, Japan: Following Matsuo.

Shinohara, Hiroshi; Giggenbach, Werner F.; Kazahaya, Kohei; Hedenquist, Jeffrey W.

doi:10.2343/geochemj.27.271

Cited by 100 publications

(85 citation statements)

References 8 publications

(26 reference statements)

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“…Both ratios are in the range of 0.5 to 5.7 obtained by the conventional gas analyses for each fumaroles, reported by Shinohara et al (1993). The SO 2 /HCl ratios of fumarolic gases analyzed for 1996 sample range between 0.9 and 2.2 for various temperature fumaroles (Shinohara, personal communication).…”

Section: The So 2 /Hcl Ratio In the Plumementioning

confidence: 97%

“…Variations in the molar HF/SiF 4 ratios with temperature were calculated for given set of partial pressures of HF and H 2 O and total pressure, with an assumption of a silica activity of unity (Rosenberg, 1973;White and Hochella, 1992). An average logarithmic HF mole fraction in high-temperature volcanic gases (>400 • C) is about −3.6 at SatsumaIwojima (Kamada, 1964;Matsuo et al, 1974;Shinohara et al, 1993). At this volcano, some low-temperature fumaroles (about 100 • C) are rich in HF with an average logarithmic HF mole fraction of about −2.6 (Kamada, 1964;Yoshida et al, 1966).…”

Section: Thermodynamic Calculationsmentioning

confidence: 99%

“…Iwodake is the high temperature over 880 • C (Shinohara et al, 1993). The chemical and isotopic compositions and fluxes of Satsuma-Iwojima's fumarolic gases and hot spring waters have been studied by many researchers (Iwasaki et al, 1962;Kamada, 1964;Matsuo et al, 1974;Shinohara et al, 1993;Hedenquist et al, 1994). The measurements at Satsuma-Iwojima were carried out on October 16, 1996.…”

Section: Measurements At Satsuma-iwojima Volcano Japanmentioning

confidence: 99%

“…These values are closer to the results from the ALS measurements. According to Shinohara et al (1993), SO 2 /HCl ratio of the common parental gas of the volcano is approximately 1.5.…”

Section: The So 2 /Hcl Ratio In the Plumementioning

confidence: 99%

“…Until present, the measurements of SiF 4 and HF in volcanic gases are very few, and the chemical nature of F-bearing species in volcanic gases is not well understood. In order to detect both HF and SiF 4 by this remote technique and to understand the fluorine chemistry of the volcanic plume, a field campaign was performed at Satsuma-Iwojima volcano, Japan, where relatively high HF concentration in volcanic gases is reported by previous investigations (e.g., Yoshida et al, 1966;Matsuo et al, 1974;Shinohara et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

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High SiF4/HF ratio detected in Satsuma-Iwojima volcano’s plume by remote FT-IR observation

et al. 2014

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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 hightemperature 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%.

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Section: The So 2 /Hcl Ratio In the Plumementioning

confidence: 97%

Section: Thermodynamic Calculationsmentioning

confidence: 99%

Section: Measurements At Satsuma-iwojima Volcano Japanmentioning

confidence: 99%

“…These values are closer to the results from the ALS measurements. According to Shinohara et al (1993), SO 2 /HCl ratio of the common parental gas of the volcano is approximately 1.5.…”

Section: The So 2 /Hcl Ratio In the Plumementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High SiF4/HF ratio detected in Satsuma-Iwojima volcano’s plume by remote FT-IR observation

et al. 2014

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Time‐averaged SO₂ fluxes of subduction‐zone volcanoes: Example of a 32‐year exhaustive survey for Japanese volcanoes

et al. 2013

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[1] All available SO 2 flux data for 32 years of Japanese volcanoes, accounting for about 10% of the world's arc volcanoes, were compiled to evaluate the temporal variation of the flux of each volcano and to estimate the time-averaged SO 2 flux. The compiled data revealed that 6 volcanoes (Tokachi, Asama, Aso, Sakurajima, Satsuma-Iwojima, and Suwanosejima volcanoes) out of 17 significantly degassing volcanoes usually contributed more than 94% of the total flux. The time-averaged annual flux was 2.2 Tg a À1, which includes intense degassing of Miyakejima volcano after 2000, which raised the figure from 1.4 Tg a À1, indicating that a single huge emitter is capable of significantly skewing regional time-averaged degassing totals and indicating that the time-averaged flux assessments for infrequent huge emitters are important for accurate estimation. The regional SO 2 flux distribution in cumulative frequency-flux plot does not obey a power law distribution. It shows a roll-off curve bending at about 500 t d À1, implying that it is misleading to assume the power law distribution for estimation of the global flux. Because the contribution of the major degassing volcanoes including the six volcanoes and additional sporadically degassing volcanoes during eruptive and posteruptive periods to the total flux is more than 95%, measurement of all large flux volcanoes can approximate the global flux.

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Fluid Geochemistry and Volcanic Unrest: Dissolving the Haze in Time and Space

Rouwet

Hidalgo

Joseph

et al. 2017

Advances in Volcanology

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The heat and gas released by a degassing magma affects the overlying predominantly meteoric aquifers to form magmatic-hydrothermal systems inside the solid body of a volcano. This chapter reviews how fluid geochemical signals help to track the evolution throughout the various stages of volcanic unrest. A direct view into a degassing magma is possible at open-conduit degassing volcanoes. Nevertheless, in most cases gas is trapped (i.e. scrubbed) by abundant water, leading to the loss of the pure signal the magma ideally provides. Deciphering how magmatic gas rises through, reacts, and re-equilibrates with the liquids in the magmatic-hydrothermal system in time and space is the only way to trace back to the pure signal. The most indicative magmatic gas species (CO 2 , SO 2 -H 2 S, HCl and HF) are released as a function of their solubility in magma. The less soluble gas species are released early from a magma at higher pressure conditions (CO 2 ) (deeper), whereas the more soluble species are released later, at lower pressures (SO 2 , HCl and HF) (shallower depth). When these gases hit the water during their rise towards the surface, they will be more or less scrubbed. Depending on the chemical equilibria inside the magmatic-hydrothermal system (e.g. SO 2 -H 2 S conversion, acidity), the gas that eventually reaches the surface will carry the history of its rise from bottom to top. Tracking volcanic unrest implies a time frame; the kinetics of magma degassing throughout the liquid cocktail inside the volcano impose the maximum resolution the volcano provides and hence the monitoring time window to be adopted for each volcano. Gas-dominated systems are "faster" and require a higher monitoring frequency, water-dominated systems are slower and require a lower monitoring frequency. ResumenEl calor y gas liberados por la desgasificación del magma afecta los acuíferos de origen predominantemente meteórico para formar sistemas magmático-hidrotermales dentro el cuerpo sólido del volcán. Este capítulo revisa como la geoquímica de fluidos puede ayudar a trazar la evolución a través de las varias etapas de "unrest" volcánico. Una visión directa dentro de un magma en desgasificación es solo posible para volcanes de conducto abierto. Sin embargo, en la mayoría de las situaciones el gas queda atrapado (i.e. "scrubbing") en el agua, que conduce a la pérdida de la señal pura que el magma idealmente puede proporcionar. Descifrar como el magma sube a través de los líquidos, y reacciona y re-equilibra con ellos dentro el sistema magmático-hidrotermal, en un marco de tiempo y espacio, es la única manera para rastrear el origen de la señal del magma. La desgasificación de magma se da por cuatro procesos: (1) durante la subida de magma, (2) por la descompresión debido al eliminar una porción del edificio volcánico, (3) debido a la convección interna dentro la cámara magmática, o (4) después de "ebullición secundaria" siguiendo el enfriamiento y consecuente cristalización. Las especies gaseosas magmáti-cas más indicativas (CO 2 , ...

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Geochemistry of volcanic gases and hot springs of Satsuma-Iwojima, Japan: Following Matsuo.

Cited by 100 publications

References 8 publications

High SiF4/HF ratio detected in Satsuma-Iwojima volcano’s plume by remote FT-IR observation

High SiF4/HF ratio detected in Satsuma-Iwojima volcano’s plume by remote FT-IR observation

Time‐averaged SO₂ fluxes of subduction‐zone volcanoes: Example of a 32‐year exhaustive survey for Japanese volcanoes

Fluid Geochemistry and Volcanic Unrest: Dissolving the Haze in Time and Space

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Geochemistry of volcanic gases and hot springs of Satsuma-Iwojima, Japan: Following Matsuo.

Cited by 100 publications

References 8 publications

High SiF4/HF ratio detected in Satsuma-Iwojima volcano’s plume by remote FT-IR observation

High SiF4/HF ratio detected in Satsuma-Iwojima volcano’s plume by remote FT-IR observation

Time‐averaged SO2 fluxes of subduction‐zone volcanoes: Example of a 32‐year exhaustive survey for Japanese volcanoes

Fluid Geochemistry and Volcanic Unrest: Dissolving the Haze in Time and Space

Contact Info

Product

Resources

About

Time‐averaged SO₂ fluxes of subduction‐zone volcanoes: Example of a 32‐year exhaustive survey for Japanese volcanoes