Dolomitization requires fluid flow for the introduction of magnesium into the system. Therefore, fluid flow is a crucial element in the origin of dolomite fabrics, and dolomite patterns may not be directly linked to depositional patterns. Gypsum and anhydrite are commonly associated with dolomitization and require the transport of sulfate into the system by hypersaline water.
The source and flow paths of dolomitizing water are best understood in the context of reflux dolomitization. The source is the tidal flat or saline lake, and the flow paths are generally downward and seaward. Patterns of burial dolomitization are difficult to predict because predolomite diagenetic history may significantly alter the permeability structure and result in dolomitizing waters following diagenetic rather than depositional flow paths.
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