Koenders, M.A. and Petford, N., 2000. Quantitative analysis and scaling of sheared granitic magmas. Geophysical Research Letters, 27 (8), pp. 1231-1234.
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We present a quantitative treatment of the macroscopic behaviour of a sheared granitic magma using Biot's theory [Biot, 1941] and a shear-dilatancy sensitive material model for the solids. The calculations are relevant to a magma in the solidosity range 0.55-0.7. The resulting excess pore pressure distribution is a function of the position and the time. Results are presented in graphical form. A scaling emerges that enables the results to be presented in non-dimensional form. A sensitivity study is carried out of the parameters describing the rheology of the solid matrix (including permeability features). The model enables the estimate of pressure and flow rates, thus opening a way of understanding the features in the granite crystal mush that are caused by upflowing magma. At high strain rates (10[-10] s[-1]) flow rates due to shear far exceed melt movement due to buoyancy effects.
|Uncontrolled Keywords:||Emplacement, magmas, granitic composition, granites, shear, quantitative analysis, dilatancy, mathematical models, pore pressure, rheology, flow mechanism, strain rates, plutonic rocks, igneous rocks|
|Subjects:||Science > Earth Sciences|
|Group:||University Executive Team|
|Deposited By:||Ms MJ Bowden|
|Deposited On:||02 Jan 2008|
|Last Modified:||07 Mar 2013 14:42|
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