Sulfur isotopic fractionation between sulfur and sulfuric acid in the hydrothermal solution of sulfur dioxide

Oana, Shinya; Ishikawa, Hitomi

doi:10.2343/geochemj.1.45

Cited by 63 publications

(30 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MIZUTANI and RAFTER (1969a) have shown this for the sulfates in the geothermal brines at Wairakei, New Zealand, having the temperature of 300°C. OANA and ISHIKAWA (1966) showed experimentally that the exchange rate of sulfur isotopes between sulfate and native sulfur is rather rapid when they are formed by disproportionation of sulfurous acid in hydrothermal solution. NAKAI (1967) even demonstrated that sulfate ion and pyrite synthesized in a hydrothermal bomb at temperatures from 200 to 300°C reached isotopic exchange equilibrium with each other within a few hours in the presence of excess native sulfur.…”

Section: Resultsmentioning

confidence: 99%

“…The sulfide sulfur may be of magmatic origin or bacterially derived from the sea water sulfate, itself. OANA and ISHIKAWA (1966) and NAKAI (1967) demonstrated experimentally that, under favorable conditions, sulfate and sulfide can isotopically equilibrate with each other in hydro thermal solution. However, a more definitive criterion than the sulfur isotopic fraction ation factor is required to determine the isotopic relationship between sulfate and sulfide as well as the origin of sulfate.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sulfur and oxygen isotopic geochemistry of sulfate in the black ore deposits of Japan

1970

View full text Add to dashboard Cite

Abstract-The sulfur isotopic values of barite, gypsum and anhydrite from the typical strata-bound submarine ore deposits (black ore deposits) of Miocene age in Japan have a narrow range of +21 to 24%o with respect to the meteoritic sulfur. However, the oxygen isotopic values (in SMOW) vary from +5 to +19%o and have a general tendency to increase in the order : barite < anhydrite -alabaster < secondary gypsum (satin spar and selenite). The sulfate minerals from the late Paleozoic cupriferrous iron sulfide ore deposits of the Yanahara and Besshi mines are similar in the sulfur isotopic values (+11 to +15%o) to inferred Permian sea water sulfate, whereas the oxygen isotopic values have a wide range of variation.The observed sulfur isotopic pattern is most likely due to a submarine hydrothermal system in which sulfate of marine origin (connate or actual sea water) predominated over other sources of sulfur. The variable oxygen isotopic data of sulfate are explained by the oxygen isotopic exchange between sulfate and water during depositional and post-depo sitional processes. The sulfur and oxygen isotopic ratios of "hot sulfate" in the Wairakei and the Red Sea geothermal brines are consistent with this idea.The sulfates in secor dary gypsum ores in the Noto mine are enriched in both 34Sand 180, suggesting that the alteration of the primary ores in this mine may have taken place under the influence of sulfate-reducing bacteria.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sulfur and oxygen isotopic geochemistry of sulfate in the black ore deposits of Japan

1970

View full text Add to dashboard Cite

show abstract

“…Significant volume of hydrothermal system would be needed to maintain H 2 S flux of 700-800 t/d at least for 2 months with dissolved and aqueous H 2 S in the hydrothermal water. Instead, if we can assume hydrolysis reaction of accumulated sulfur to H 2 S (Oana and Ishikawa 1966;Ellis and Giggenbach 1971) in the hydrothermal system of Mt. Ontake, the volume of the system needed may be drastically decreased.…”

Section: Discussionmentioning

confidence: 99%

Volcanic plume measurements using a UAV for the 2014 Mt. Ontake eruption

et al. 2016

View full text Add to dashboard Cite

A phreatic eruption of Mt. Ontake, Japan, started abruptly on September 27, 2014, and caused the worst volcanic calamity in recent 70 years in Japan. We conducted volcanic plume surveys using an electric multirotor unmanned aerial vehicle to elucidate the conditions of Mt. Ontake's plume, which is flowing over 3000 m altitude. A plume gas composition, sulfur dioxide flux and thermal image measurements and a particle sampling were carried out using the unmanned aerial vehicle for three field campaigns on November 20 and 21, 2014, and June 2, 2015. Together with the results of manned helicopter and aircraft observations, we revealed that the plume of Mt. Ontake was not directly emitted from the magma but was influenced by hydrothermal system, and observed SO 2 /H 2 S molar ratios were decreasing after the eruption. High SO 2 flux of >2000 t/d observed at least until 20 h after the onset of the eruption implies significant input of magmatic gas and the flux quickly decreased to about 130 t/d in 2 months. In contrast, H 2 S fluxes retrieved using SO 2 /H 2 S ratio and SO 2 flux showed significantly high level of 700-800 t/d, which continued at least between 2 weeks and 2 months after the eruption. This is a peculiar feature of the 2014 Mt. Ontake eruption. Considering the trends of the flux changes of SO 2 and H 2 S, we presume that majority of SO 2 and H 2 S are supplied, respectively, from high-temperature magmatic fluid of a deep origin and from hydrothermal system. From the point of view of SO 2 /H 2 S ratios and fumarolic temperatures, the plume degassing trend after the 2014 eruption is following the similar course as that after the 1979 eruptions, and we speculate the 2014 eruptive activity will cease slowly similar to the 1979 eruption.

show abstract

“…(11) (Oana and Ishikawa, 1966;Giggenbach, 1987). Subaerial venting of SO2 and H2S will result in precipitation of native sulfur by reaction (11) or by direct oxidation of H2S with atmospheric 02: (12) Reactions (11) and (12) are expected to occur in subaerial fumaroles of the 1953-54 cinder cone as well as subaqueous fumaroles exposed to the atmosphere by the decline and disappearance of the lake.…”

Section: Sulfur Isotopesmentioning

confidence: 99%

Oxygen, hydrogen, and sulfur isotope systematics of the crater lake system of Poas Volcano, Costa Rica.

Rowe

1994

Geochem. J.

View full text Add to dashboard Cite

Sulfur isotopic fractionation between sulfur and sulfuric acid in the hydrothermal solution of sulfur dioxide

Cited by 63 publications

References 5 publications

Sulfur and oxygen isotopic geochemistry of sulfate in the black ore deposits of Japan

Sulfur and oxygen isotopic geochemistry of sulfate in the black ore deposits of Japan

Volcanic plume measurements using a UAV for the 2014 Mt. Ontake eruption

Oxygen, hydrogen, and sulfur isotope systematics of the crater lake system of Poas Volcano, Costa Rica.

Contact Info

Product

Resources

About