The ability of temperature to influence the mobility of diagenetically generated dissolved silica in sediment-pore water systems is discussed. The theory suggests that probable mean distances of diffusive transport for dissolved components are of the proper order of magnitude to allow silica and other dissolved components derived from illitization reactions to migrate out of shale beds and into sand formations. The effect of increasing temperature is to reduce the distance of solution transport, perhaps to the extent that the temperature at which illitization proceeds may control the spatial distribution of zones of silica cementation.

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