A model for the rheology of particle-bearing suspensions and partially molten rocks

Antonio Costa , Luca Caricchi (1, 2) , Nickolai Bagdassarov

1 ISTO - Institut des Sciences de la Terre d'Orléans
2 D-ERDW - Department of Earth Sciences [Swiss Federal Institute of Technology - ETH Zürich]

This contribution presents a semiempirical model describing the effective relative viscosity of crystal-bearing magmas as function of crystal fraction and strain rate. The model was applied to an extensive data set of magmatic suspensions and partially molten rocks providing a range of values for the fitting parameters that control the behavior of the relative viscosity curves as a function of the crystal fraction in an intermediate range of crystallinity (30-80 vol % crystals). The analysis of the results and of the materials used in the experiments allows for evaluating the physical meaning of the parameters of the proposed model. We show that the model, by varying the parameters within the ranges obtained during the fitting procedure, is able to describe satisfactory the effective relative viscosity as a function of crystal fraction and strain rate for suspensions having different geometrical characteristics of the suspended solid fraction.

Mots clés: Tectonophysics: Rheology: general (1236; 8032); Volcanology: Lava rheology and morphology; Volcanology: Physics and chemistry of magma bodies; melts; concentrated suspensions; viscosity; strain rate

Domaines: Planète et Univers [physics]

Antonio Costa, Luca Caricchi, Nickolai Bagdassarov. A model for the rheology of particle-bearing suspensions and partially molten rocks. Geochemistry, Geophysics, Geosystems, 2009, 10, pp. 733-750. ⟨10.1029/2008GC002138⟩. ⟨insu-03596896⟩