Constraints on the formation of sedimentary dolomite


Journal Article

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. Copyright © 1981 AAAS.

Full Text

Duke Authors

Cited Authors

  • Baker, PA; Kastner, M

Published Date

  • January 1, 1981

Published In

Volume / Issue

  • 213 / 4504

Start / End Page

  • 214 - 216

International Standard Serial Number (ISSN)

  • 0036-8075

Digital Object Identifier (DOI)

  • 10.1126/science.213.4504.214

Citation Source

  • Scopus