Salt-dome calcite

Most limestones are formed from the bicarbonate ion of sea water, HCOg , (which in turn comes from atmospheric COg) and have the normal content. The salt-dome calcite, on the other hand, is formed by the combination of a calcium ion, Ca++, and the CO resulting from the oxidation of petroleum (hence from an organic source with less These... 

The transport of significant amounts of dissolved calcite by convection (Wood Hewett, 1984) can probably also be excluded, as convection cells are usually not active except in special settings with strongly sloping isotherms, such as adjacent to salt domes (Bjorlykke etal., 1988). This point of view is supported by the fact that we observe no systematic tendency for calcite cement to be concentrated near the base of a sandstone (i.e. a convection cell) and quartz cement near the top, as one would expect if convection were controlling cementation (Bjorlykke Egeberg, 1993). 

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