Page "Syenite" Paragraph 11
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This process is only referring to the macroscopic result of relative SiO < sub > 2 </ sub > depletion in a rock.
The actual physical process leading to this SiO < sub > 2 </ sub > depletion may vary in a given metamorphic environment.
Diffusion of chemical components in a stagnant fluid, related to differences in chemical potential or pressure as well as advection of a SiO < sub > 2 </ sub >- undersaturated fluid may lead to the dissolution of quartz from the un-altered rock, thus depleting it of this component.
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