Figure 3-3. Microsparitic limestone with three small stylolites (red arrows) and two areas of silicification (S). This image is typical of the entire sample, which consists of stylolitic carbonate with areas of silicification between the stylolite. This arrangement could be interpreted as resulting from more extensive cementation near the stylolites, which acted as sources of dissolved solids for cementation, and subsequent silicification of inter-stylolite zones in which greater porosity and permeability remained. An alternate interpretation is that early silicification mechanically dictated the location of stylolite development, but such an interpretation would require an explanation of why silicification would have been localized to diffuse horizontal zones like those seem here.

      Photomicrograph was taken in plane-polarized light; field of view is 1.6 mm wide. Location unkown; Sample 62-17; thin section62-17. Sample collected by Dr. Gilles O. Allard.

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