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Book Chapter

Dolomitization Kinetics: Recent Experimental Studies

By
Alan M. Gaines
Alan M. Gaines
Division of Earth Sciences, National Science FoundationWashington, DC 20550
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Published:
January 01, 1980

Abstract

Experimental studies of the kinetics of reaction of calcium carbonate with magnesium-calcium chloride solutions indicate a solution-reprecipitation mechanism with a cation-ordered protodolomite as the initial reaction product. Nucleation of ordered dolomite is extremely difficult at low temperatures and is an important factor in the reaction. The kinetics of the reaction are strongly dependent on temperature and on the reactant (calcite or aragonite). Experimental dolomitization of aragonite at 100°C and atmospheric pressure has allowed the reaction to be studied under conditions approaching those of natural sedimentary environments. These studies indicate that other important kinetic factors include the ionic strength (salinity) and Mg++/Ca++ ratio in the dolomitizing fluids and the presence of strongly hydrated ions. Certain amino acids and soluble proteins severely inhibit the reaction, but may be removed by oxidation. The results of these experiments may aid in the interpretation of the processes involved in sedimentary dolomitization.

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Contents

SEPM Special Publication

Concepts and Models of Dolomitization

Donald H. Zenger
Donald H. Zenger
Pomona College, Claremont, California
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John B. Dunham
John B. Dunham
Union Oil Research Center, Brea, California
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Raymond L. Ethington
Raymond L. Ethington
Ethington, University of Missouri-Columbia
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SEPM Society for Sedimentary Geology
Volume
28
ISBN electronic:
9781565761582
Publication date:
January 01, 1980

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