A new theory of bubble formation in magma

Kou Yamada, Hidekazu Tanaka, Kiyoshi Nakazawa, Hiroyuki Emori

研究成果: Article査読

27 被引用数 (Scopus)

抄録

We have newly developed an accurate theoretical model of bubble formation in supersaturated magma with a relatively low viscosity under the formulation by Toramaru (1995). Such a model is essential in deriving considerable information from the data of bubble nucleation in the recent decompression experiments. We obtain analytical solutions for the time evolution of the nucleation rate and the number density of nucleated bubbles in cases with constant decompression rates and constant supersaturation pressures. Both the bubble number density and the duration time of nucleation obtained in this study are larger than those obtained by Toramaru by a factor of 10. We find that the uncertainty of several orders in the classical nucleation rate has little effect on the final number density of bubbles in cases of continuous decompression. In the formulation by Toramaru, a spatially uniform volatile concentration surrounding the growing bubbles is assumed. We also construct a nonuniform concentration model and subsequently show that an uniform concentration model is valid for the evaluation of the bubble number density. Finally, we apply our model to the recent decompression experiments and indirectly estimate the surface tensions of the rhyolitic melt with only H2O and with H2O and CO2. Our indirect estimates indicate that the surface tensions for 7 wt % H2O dissolved in melt are 0.08 ± 0.01 N m-1 for samples with no CO2 and 0.07 ± 0.01 N m-1 for samples with a considerable amount of CO2, respectively. These estimations are consistent with the available experimental values of the surface tension.

本文言語English
論文番号B02203
ページ(範囲)1-17
ページ数17
ジャーナルJournal of Geophysical Research: Solid Earth
110
2
DOI
出版ステータスPublished - 2005 2 4
外部発表はい

ASJC Scopus subject areas

  • 地球化学および岩石学
  • 地球物理学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 大気科学
  • 天文学と天体物理学
  • 海洋学

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