In a recent article on chemical compaction of sandstones, Sheldon et al. (2003) claim that models of quartz cementation based upon the diffusional transport of dissolved silica originating from the clay-induced dissolution (CID) of quartz at stylolites are untenable because no chemical driving force is available to drive silica diffusion in the aqueous phase. As examples of such untenable models, they cite a number of our papers (Oelkers et al. 1992, 1996; Walderhaug 1994; Bjørkum 1996; Bjørkum and Nadeau 1998; Bjørkum et al. 1998; Walderhaug et al. 2001). In the following discussion...

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