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Science 10 July 1981:
Vol. 213. no. 4504, pp. 214 - 216
DOI: 10.1126/science.213.4504.214
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Articles

Constraints on the Formation of Sedimentary Dolomite

PAUL A. BAKER 1 and MIRIAM KASTNER 1

1 Scripps Institution of Oceanography, University of California, San Diego, La Jolla 92093

The experimental replacement of calcite and aragonite by dolomite under a variety of conditions indicates that dolomitization can take place in marine and lacustrine environments under two conditions: (i) low dissolved sulfate concentrations and (ii) insubstantial contemporaneous silica diagenesis. Common sites for dolomite formation are areas where the dissolved sulfate concentration is reduced by microbial sulfate reduction, through the mixing of seawater with large amounts of fresh water, or where low-sulfate alkaline lacustrine environments prevail. Even under these conditions, dolomite formation may be inhibited by the concurrent transformation of opal-A (amorphous silica) to opal-CT (disordered cristobalite and tridymite), whereas the subsequent transformation of opal-CT to quartz favors the formation of dolomite.

Submitted on January 28, 1981
Revised on March 26, 1981


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