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Large variations in the perfection of order and in substitution of calcium for magnesium occur in sedimentary dolomite, and complicate the trace element and isotopie chemistry of this complex mineral. The stabilization of metastable disordered and/or Ca-rich phases is as important in forming ancient dolomitic rocks as is the stabilization of aragonite and Mg-calcite in forming ancient limestones.

The equilibrium value of Δ18O (δ18Odolomite—δ18Ocalcile) is most likely 3 ± 1% at 25°C. Redetermination of phosphoric acid fractionation factors (α=(18O/l6OCO2 )/(18O/16...

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