Equilibrium temperature and redox state of volcanic gas at Unzen volcano, Japan
書誌事項
- 公開日
- 1994-05
- 権利情報
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- https://www.elsevier.com/tdm/userlicense/1.0/
- https://www.elsevier.com/legal/tdmrep-license
- DOI
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- 10.1016/0377-0273(94)90055-8
- 公開者
- Elsevier BV
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説明
Abstract High-temperature volcanic gases were collected from a growing dacitic dome of Unzen volcano, Japan. Apparent equilibrium temperatures (AET) were calculated for the following two reactions, SO2+3H2=H2S+2H2O and CO2+H2=CO+H2O. Both the AET's are higher than the outlet temperature (To). Two hypotheses are examined as a cause of this disagreement; one is a partial advancement in the reaction SO2+3H2→H2S+2H2O, the other is an addition of external water after a final equilibrium attainment. Based on these hypotheses the equilibrium compositions, temperatures and redox potentials were estimated resulting in similar values. The estimated temperatures range from 850 to 911°C, which is consistent with a petrological estimation made with the lava; however, the estimated redox potential is one unit less in logfo2 scale than the petrological estimation.
収録刊行物
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- Journal of Volcanology and Geothermal Research
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Journal of Volcanology and Geothermal Research 60 (3-4), 263-272, 1994-05
Elsevier BV