The vis osity of sili ate melts ontrols magma transport dynami s, eruption style and rates of physi o hemi al pro esses in natural magmas. A predi tive model for vis osity of natural sili ate melts at geologi al onditions has been a long-term goal in earth s ien e for over half a entury. During that time, the number of vis osity models has in reased and the rate of in rease is a elerating. This growth in the vis osity model ling industry is driven by innovations in the experimental laboratory over the last 30 years allowing for vis osity measurements over larger ranges of temperature and omposition. Here we review the models and modelling strategies for melt vis osity from the original work of Shaw [1℄ and Bottinga and Weill [2℄ to now [3-7℄. We suggest that the best models are those that onform to the operational denition of a model [8℄; in addition to a strong predi tive apability, models must omprise: wel l- onstrained logi al propositions (i.e. onstru t) with ne essary, testable onsequen es . For example, the GRD [7℄ model predi ts the nonArrhenian vis osity of natural sili ate melts as a fun tion of T and melt omposition, but, an also predi t and be tested against other transport properties in luding Tg , melt fragility, and a tivation energy. Su h testing, by hundreds of users, has delineated the strengths and weaknesses of the GRD model. As we begin to develop the next-generation model, we are urrently assessing whether the key is: i) more data, ii) better data, or iii) a better physi al hemi al guiding model? Referen es [1℄ Shaw H.R. (1972), Am. Jour. S i. 272, 870-893. [2℄ Bottinga Y. and Weill, D. (1972), Am. Jour. S i. 272, 438-475. [3℄ Baker D.R. (1996), Am. Mineral. 81, 126-134. [4℄ Hess K.U. and Dingwell D.B. (1996), Am. Mineral. 81, 1297-1300. [5℄ Avramov I. (2007), J. Vol . Geoth. Res. 160, 165-174. [6℄ Hui H. and Zhang Y. (2007), Geo h. Cosmo h. A ta 71, 403-416. [7℄ Giordano D. et al. (2008), Earth & Planet S i Lets, 271, 123-134. [8℄ Greenwood H.J. (1989), Can. Mineral. 1-14.
Modelling natural silicate melt viscosity
GIORDANO, Daniele;
2013-01-01
Abstract
The vis osity of sili ate melts ontrols magma transport dynami s, eruption style and rates of physi o hemi al pro esses in natural magmas. A predi tive model for vis osity of natural sili ate melts at geologi al onditions has been a long-term goal in earth s ien e for over half a entury. During that time, the number of vis osity models has in reased and the rate of in rease is a elerating. This growth in the vis osity model ling industry is driven by innovations in the experimental laboratory over the last 30 years allowing for vis osity measurements over larger ranges of temperature and omposition. Here we review the models and modelling strategies for melt vis osity from the original work of Shaw [1℄ and Bottinga and Weill [2℄ to now [3-7℄. We suggest that the best models are those that onform to the operational denition of a model [8℄; in addition to a strong predi tive apability, models must omprise: wel l- onstrained logi al propositions (i.e. onstru t) with ne essary, testable onsequen es . For example, the GRD [7℄ model predi ts the nonArrhenian vis osity of natural sili ate melts as a fun tion of T and melt omposition, but, an also predi t and be tested against other transport properties in luding Tg , melt fragility, and a tivation energy. Su h testing, by hundreds of users, has delineated the strengths and weaknesses of the GRD model. As we begin to develop the next-generation model, we are urrently assessing whether the key is: i) more data, ii) better data, or iii) a better physi al hemi al guiding model? Referen es [1℄ Shaw H.R. (1972), Am. Jour. S i. 272, 870-893. [2℄ Bottinga Y. and Weill, D. (1972), Am. Jour. S i. 272, 438-475. [3℄ Baker D.R. (1996), Am. Mineral. 81, 126-134. [4℄ Hess K.U. and Dingwell D.B. (1996), Am. Mineral. 81, 1297-1300. [5℄ Avramov I. (2007), J. Vol . Geoth. Res. 160, 165-174. [6℄ Hui H. and Zhang Y. (2007), Geo h. Cosmo h. A ta 71, 403-416. [7℄ Giordano D. et al. (2008), Earth & Planet S i Lets, 271, 123-134. [8℄ Greenwood H.J. (1989), Can. Mineral. 1-14.
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