Effect of grain size on the distribution and transport of deep-seated fluids and melts

Physics

Scientific paper

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Mineralogy And Petrology: General Or Miscellaneous, Physical Properties Of Rocks: Microstructure, Volcanology: Magma Migration

Scientific paper

Because permeability increases with the square of the grain size for a given fluid fraction, it is commonly assumed that porous flow of fluids and melts is more effective in coarse-grained domains of deep-seated rocks. This relative behavior is accurate, however, only as a description of two systems operating in isolation. We demonstrate that if coarse- and fine-grained domains are in chemical communication, then equilization of pore-wall curvature across the system results in concentration of fluid or melt in domains of finer grain size. Because of this localization of fluid, the permeability of the finer-grained domains will match or exceed that of domains with coarser grains. Fluid focussing due to differences in grain size has potentially important implications for grain-scale transport of metamorphic fluids-including those released from subducting slabs into the sheared mantle wedge-and also for partial melts in the mantle and deep crust.

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