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Authors: Costa, A.* 
Caricchi, L.* 
Bagdassarov, N.* 
Title: A model for the rheology of particle-bearing suspensions and partially molten rocks
Issue Date: 18-Mar-2009
Series/Report no.: 3/10(2009)
DOI: 10.1029/2008GC002138
Keywords: melts
concentrated suspensions
strain rate
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.05. Rheology 
04. Solid Earth::04.08. Volcanology::04.08.03. Magmas 
05. General::05.01. Computational geophysics::05.01.03. Inverse methods 
Abstract: This contribution presents a semiempirical model describing the effective relative viscosity of crystalbearing 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.
Description: An edited version of this paper was published by AGU. Copyright (2009) American Geophysical Union
Appears in Collections:Papers Published / Papers in press

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