An expanded model and application of the combined effect of crystal-size distribution and crystal shape on the relative viscosity of magmas - Institut de Mathématiques de Marseille 2014- Accéder directement au contenu
Article Dans Une Revue Journal of Volcanology and Geothermal Research Année : 2018

An expanded model and application of the combined effect of crystal-size distribution and crystal shape on the relative viscosity of magmas

Johannes Klein
  • Fonction : Auteur
Christoph Helo
  • Fonction : Auteur
Silja Schweitzer
  • Fonction : Auteur
Lucia Gurioli
Jonathan Castro
  • Fonction : Auteur

Résumé

This study examines the combined effect of crystal-size distributions (CSD) and crystal shape on the rheology of vesicle free magmatic suspensions and provides the first practical application of an empirical model to estimate the relative effect of crystal content and CSD's on the viscosity of magma directly from textural image analysis of natural rock samples in the form of a user-friendly texture-rheology spreadsheet calculator. We extend and apply established relationships between the maximum packing fraction ϕm of a crystal bearing suspension and both its rheological properties and the polydispersity γ of a CSD. By using analogue rotational rheometric experiments with glass fibres and glass flakes in silicone oil acting as magma equivalent, this study also provides new insights in the relationship between ϕm and the aspect ratio rp of suspended particles.

Domaines

Volcanologie
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Dates et versions

hal-01877256 , version 1 (19-09-2018)

Identifiants

Citer

Johannes Klein, Sebastian Mueller, Christoph Helo, Silja Schweitzer, Lucia Gurioli, et al.. An expanded model and application of the combined effect of crystal-size distribution and crystal shape on the relative viscosity of magmas. Journal of Volcanology and Geothermal Research, 2018, 357, pp.128 - 133. ⟨10.1016/j.jvolgeores.2018.04.018⟩. ⟨hal-01877256⟩
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