Earth, Planets and Space

, Volume 55, Issue 2, pp 105–110 | Cite as

Interaction between magmatic fluid and meteoric water, inferred from 18O/16O and 36Ar/H2O ratios of fumarolic gases at the Kusatsu Shirane volcano, Japan

  • Michiko Ohwada
  • Takeshi Ohba
  • Jun-ichi Hirabayashi
  • Kenji Nogami
  • Kazushige Nakamura
  • Keisuke Nagao
Open Access
Article

Abstract

Fumarolic gases from the Kusatsu Shirane volcano, Japan were analyzed for the content and isotopic compositions of H2O, the abundances and isotopic compositions of noble gas. The observed δ18O and 36Ar/H2O ratios could not be explained by an existing hydrothermal model in which a mixing between magmatic vapor (MAV) and meteoric water (ASW), a single-step separation to vapor and liquid phases and a subsequent partial H2O vapor removal from the vapor phase have been considered. We constructed a revised model in which two-step mixing-separation and a subsequent partial H2O vapor removal by condensation were considered. In the model, the first step was the mixing between MAV and ASW, and a subsequent separation to a primary vapor and liquid phases. In the secondary step, the primary vapor mixed with another fluid which has a δ18O lower than the primary vapor phase and a low 36Ar/H2O ratio relative to ASW. The mixture separates to secondary vapor and liquid phases. The fluid with low 36Ar/H2O ratio could be ASW partially vaporized in the geothermal area. The secondary vapor ascended and discharged as fumarolic gas. In the ascending process, the secondary vapor suffers a partial H2O vapor removal by condensation in various degrees.

Keywords

Meteoric Water Steam Explosion Geothermal Area Secondary Vapor Unzen Volcano 

References

  1. Aka, F. T., M. Kusakabe, K. Nagao, and G. Tanyileke, Noble gas isotopic compositions and water/gas chemistry of soda springs from the islands of Bioko, São Tome and Annobon, along with Cameroon Volcanic Line, West Africa, Appl. Geochem., 16, 323–338, 2001.CrossRefGoogle Scholar
  2. Coleman, M. L., T. J. Shepherd, J.J. Durham, J. E. Rouse, and G. R. Moore, Reduction of water with zinc for hydrogen isotope analysis, Anal. Chem., 54, 993–995, 1982.CrossRefGoogle Scholar
  3. Epstein, S. and T. K. Mayeda, Variation of O18 content of waters from natural sources, Geochim. Cosmochim. Acta, 4, 213–224, 1953.CrossRefGoogle Scholar
  4. Faculty of Engineering, Tokyo Institute of Technology, Faculty of Science and Technology, Sophia University, and Faculty of Technology, Saitama University, Geochemical study on the 1982–1983 eruption of the Kusatsu-Shirane volcano (I), Report of Coordinating Committee for Prediction of Volcanic Eruptions, 26, 8–9, 1983 (in Japanese).Google Scholar
  5. Giggenbach, W. F. and R. L. Goguel, Collection and analysis of geothermal and volcanic water and gas discharges, DSIR Chemistry Division Report, 2401, 1–81, 1989.Google Scholar
  6. Hanyu, T. and I. Kaneoka, Magmatic processes revealed by noble gas signatures: the case of Unzen Volcano, Japan, Geochem. J., 31, 395–405, 1997.CrossRefGoogle Scholar
  7. Harvey, A. H. and J. M. H. L. Sengers, Correlation of aqueous Henry’s constants from 0°C to the critical point, AIChEJ., 36, 539–546, 1990.CrossRefGoogle Scholar
  8. Hiyagon, H., M. Ozima, B. M. Marty, S. Zashu, and H. Sasaki, Noble gases in submarine glasses from mid-oceanic ridges and Loihi seamount: Constructions on the early history of the Earth, Geochim. Cosmochim. Acta, 56, 1301–1316, 1992.CrossRefGoogle Scholar
  9. Hoefs, J., Stable Isotope Geochemistry, 241 pp., Springer, New York, 1980.CrossRefGoogle Scholar
  10. Horita, J. and D. J. Wesolowski, Liquid-vapor fractionation of oxygen and hydrogen isotopes of water from the freezing to the critical temperature, Geochim. Cosmochim. Acta, 58, 3425–3437, 1994.CrossRefGoogle Scholar
  11. Kagiyama, T, J. Hirabayashi, T. Ohba, and M. Iguchi, Geothermal avtivity at Kusatsu-Shirane volcano, Rep. Joint Observation of Kusatsu-Shirane Volcano, 37–44, 1992 (in Japanese).Google Scholar
  12. Kusakabe, M. and O. Matsubaya, Volatiles in Magmas, volcanic gases, and thermal waters, Bull. Vol. Soc. Japan, 30, S267–S283, 1986 (in Japanese with English abstract).Google Scholar
  13. Kusakabe, M., H. Sato, S. Nakada, and T. Kitamura, Water contents and hydrogen isotopic ratios of rocks and minerals from the 1991 eruption of Unzen volcano, Japan, J. Volcanol. Geotherm. Res., 89, 231–242, 1999.CrossRefGoogle Scholar
  14. Matsuhisa, Y., Oxygen isotopic compositions of volcanic rocks from the east Japan island arcs and their bearing on petrogenesis, J. Volcanol. Geotherm. Res., 5, 271–296, 1979.CrossRefGoogle Scholar
  15. Matsuhisa, Y., and H. Kurasawa, Oxygen and strontium isotopic characteristics of calc-alkalic volcanic rocks from the central and western Japan arcs: evaluation of contribution of crustal components to the magmas, In Arc Volcanism, edited by S. Aramaki and I. Kushiro, J. Volcanol. Geotherm. Res., 18, 483–510, 1983.CrossRefGoogle Scholar
  16. Niedermann, S., W. Bach, and J. Erzinger, Noble gas evidence for a lower mantle in MORBs from the southern East Pacific Rise: Decoupling of helium and neon isotope systematics, Geochim. Cosmochim. Acta, 61, 2697–2715, 1997.CrossRefGoogle Scholar
  17. Ohba, T, J. Hirabayashi, and K. Nogami, D/H and 18O/16O ratios of water in the crater lake at Kusatsu-Shirane volcano, Japan, J. Volcanol. Geotherm. Res., 97, 329–346, 2000.CrossRefGoogle Scholar
  18. Ossaka, J., T. Ozawa, T. Nomura, T. Ossaka, J. Hirabayashi, A. Takaesu, and T. Hayashi, Variation of Chemical compositions in volcanic gases and waters at Kusatsu-Shirane volcano and its activity in 1976, Bull. Volcanol., 43, 207–216, 1980.CrossRefGoogle Scholar
  19. Ozawa, T., Chemical analysis of volcanic gases: I. Chemical analysis of volcanic gases containing water vapor, hydrogen chloride, sulfur dioxide, hydrogen sulfide, carbon dioxide, etc, Geochem. Int., 5, 939–947, 1968.Google Scholar
  20. Ozima, M. and F. A. Podosek, Noble Gas Geochemistry, 286 pp., Cambridge University Press, Cambridge, 2002.Google Scholar
  21. Ozima, M. and S. Zashu, Noble gases in submarine pillow volcanic glasses, Earth Planet. Sci. Lett., 62, 24–40, 1983.CrossRefGoogle Scholar
  22. Sarda, P. and D. Graham, Mid-ocean ridge popping rocks: Implications for degassing at ridge crests, Earth Planet. Sci. Lett., 97, 268–289, 1990.CrossRefGoogle Scholar
  23. Soya, T, K. Uto, and M. Shimoya, Steam explosion of Kusatsu-Shirane Volcano, October 26, 1982, Chisitu News, 341, 7–16, 1983 (in Japanese).Google Scholar
  24. Taylor, B. E., Magmatic volatiles: Isotopic variation of C, H, and S, in Stable Isotopes, edited by J. W. Valley, H. P. J. Taylor, and J. R. O’Neil, Mineralogical Society of America, 185–225, 1986.Google Scholar

Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2003

Authors and Affiliations

  • Michiko Ohwada
    • 1
  • Takeshi Ohba
    • 1
  • Jun-ichi Hirabayashi
    • 1
  • Kenji Nogami
    • 1
  • Kazushige Nakamura
    • 1
  • Keisuke Nagao
    • 1
  1. 1.Volcanic Fluid Research CenterTokyo Institute of TechnologyTokyoJapan

Personalised recommendations