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Pommier, A, Evans RL, Key K, Tyburczy JA, Mackwell S, Elsenbeck J.  2013.  Prediction of silicate melt viscosity from electrical conductivity: A model and its geophysical implications. Geochemistry Geophysics Geosystems. 14:1685-1692.   10.1002/ggge.20103   AbstractWebsite

Our knowledge of magma dynamics would be improved if geophysical data could be used to infer rheological constraints in melt-bearing zones. Geophysical images of the Earth's interior provide frozen snapshots of a dynamical system. However, knowledge of a rheological parameter such as viscosity would constrain the time-dependent dynamics of melt bearing zones. We propose a model that relates melt viscosity to electrical conductivity for naturally occurring melt compositions (including H2O) and temperature. Based on laboratory measurements of melt conductivity and viscosity, our model provides a rheological dimension to the interpretation of electromagnetic anomalies caused by melt and partially molten rocks (melt fraction similar to >0.7).