Inferring volcanic degassing processes from vesicle size distributions

JD Blower*, JP Keating, HM Mader, Jeremy C Phillips

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

75 Citations (Scopus)

Abstract

Both power law and exponential vesicle size distributions (VSDs) have been observed in many different types of volcanic rocks. We present results of computer simulations and laboratory analogue experiments which reproduce these findings and show that the distributions can be interpreted as the product of continuous bubble nucleation resulting from non-equilibrium degassing. This ongoing nucleation causes the bubbles to evolve through an exponential size distribution into a power law size distribution as nucleation and growth progress. These findings may explain the apparent contradiction between present models of bubble growth in magmas, which predict that degassing in explosive eruptions is a non-equilibrium process, and models of conduit how, which assume perfect equilibrium degassing. The process of continuous nucleation is the mechanism whereby the volcanic system maintains near-equilibrium in the case of rapid depressurization and slow volatile diffusion.

Translated title of the contributionInferring volcanic degassing processes from vesicle size distributions
Original languageEnglish
Pages (from-to)347-350
Number of pages4
JournalGeophysical Research Letters
Volume28
Issue number2
Publication statusPublished - 15 Jan 2001

Bibliographical note

Publisher: American Geophysical Union
Other identifier: IDS number 392MN

Keywords

  • BUBBLE-GROWTH
  • DYNAMICS
  • ROCKS
  • CRYSTALLIZATION
  • ERUPTION
  • SYSTEMS
  • MODEL
  • LAVAS
  • MELTS

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