Heydari (2000) presents a series of calculations and interpretations based on 24 modal analyses covering a limestone interval 36 m (117 ft) thick. This is an impressive application of quantitative petrography to determine the detailed mechanisms of carbonate diagenesis. Although I reviewed this article in manuscript, I did not have the opportunity to comment on the use of a model for convective circulation of formation water, which was added after my review was completed and which now stands as the main conclusion arrived at by this study. This discussion contends that (1) the convective circulation model used to explain apparent...

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