ABSTRACT
In terms of the relative speed of transport of chemical components, fluid flowing along a fracture network is typically the fastest, followed by fluid flow along grain boundaries. Diffusion through intergranular fluid is usually slower than fluid flow, and diffusion in the solid state, along fluid-free grain boundaries and especially through crystal lattices, is generally the slowest. Movement in a flowing fluid is called advective or infiltration transport, and movement by diffusion is, amazingly enough, called diffusive transport.
