Numerical study of nucleation and growth of bubbles in viscous magmas

研究成果: ジャーナルへの寄稿学術誌査読

180 被引用数 (Scopus)

抄録

The nucleation and growth processes of bubbles in viscous magmas with a constant decompression rate have been numerically investigated based on a formulation which accounts for effects of viscosity, as well as diffusivity, interfacial tension, and decompression rate. The numerical solutions show two regimes in the nucleation and growth process, a diffusion-controlled regime and a viscosity-controlled regime, mainly depending on the decompression rate, initial saturation pressure and viscosity. The transition between the two regimes dramatically occurs when the value of the above parameter decreases below about 2 × 103. In the viscosity-controlled regime abundant tiny bubbles (exceeding 1014 (m-3)) form with a relatively high internal pressure. In basaltic eruptions the vesiculation is essentially controlled by diffusion, and the viscosity-controlled regime is limited to very high decompression rate and very small water content. When andesitic magma saturated by water at 10 MPa is decompressed through the propagation of rarefaction wave induced by a landslide, the vesiculation is controlled by the viscosity up to 100 m depth. In a rhyolitic magma for the same situation, vesiculation is controlled by the viscosity over the whole depth of the magma column. -from Author

本文言語英語
ページ(範囲)1913-1931
ページ数19
ジャーナルJournal of Geophysical Research
100
B2
DOI
出版ステータス出版済み - 1月 1 1995
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 林業
  • 海洋学
  • 水圏科学
  • 生態学
  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地表過程
  • 大気科学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 古生物学

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