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http://hdl.handle.net/2122/5400
Authors: | Costa, A.* Caricchi, L.* Bagdassarov, N.* |
Title: | A model for the rheology of particle-bearing suspensions and partially molten rocks | Journal: | Geochem. Geophys. Geosyst | Series/Report no.: | 3/10(2009) | Publisher: | AGU and the Geochemical Society | Issue Date: | 18-Mar-2009 | DOI: | 10.1029/2008GC002138 | Keywords: | melts concentrated suspensions viscosity strain rate |
Subject Classification: | 04. 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: | Article published / in press |
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