Concepts and Models of Dolomitization
Special Publication 28 has its roots in the 22nd Annual Research Symposium of SEPM entitled Concepts and Models of Dolomitization – Their Intricacies and Significance held on April 3,1979 in Houston, Texas as part of the joint annual meetings of AAPG and SEPM. The purpose of that symposium was to express the state-of-the-art of the study of the elusive process(es) of dolomitization. Most of the contributions in this volume are concerned with apparent early, nearsurface dolomitization, either by hypersaline brines, by the marine-meteoric mixing model or some variant thereof, or by both mechanisms where more than one phase or kind of dolomite exists, or where the origin of a particular dolomite is uncertain. Other models and aspects of dolomitization are treated here as well.
Lynton S. Land, 1980. "The Isotopic and Trace Element Geochemistry of Dolomite: The State of the Art", Concepts and Models of Dolomitization, Donald H. Zenger, John B. Dunham, Raymond L. Ethington
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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...