Kinetics of dolomitization

Research Article| December 01, 1987 Kinetics of dolomitization Duncan F. Sibley; Duncan F. Sibley 1Department of Geological Sciences, Michigan State University, East Lansing, Michigan 48824-1115 Search for other works by this author on: GSW Google Scholar Robert E. Dedoes; Robert E. Dedoes 1Department of Geological Sciences, Michigan State University, East Lansing, Michigan 48824-1115 Search for other works by this author on: GSW Google Scholar Timothy R. Bartlett Timothy R. Bartlett 1Department of Geological Sciences, Michigan State University, East Lansing, Michigan 48824-1115 Search for other works by this author on: GSW Google Scholar Geology (1987) 15 (12): 1112–1114. https://doi.org/10.1130/0091-7613(1987)15<1112:KOD>2.0.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Duncan F. Sibley, Robert E. Dedoes, Timothy R. Bartlett; Kinetics of dolomitization. Geology 1987;; 15 (12): 1112–1114. doi: https://doi.org/10.1130/0091-7613(1987)15<1112:KOD>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Dolomitization of CaCO3 in the laboratory at ≥175 °C demonstrates that the transformation has two distinct stages: an induction stage during which no detectable products form and a nucleation-growth stage during which dolomite forms at the expense of the reactant CaCO3. Experiments at 218 °C demonstrate that as the Mg/Ca ratio of the solution increases, the length of the induction stage decreases. Addition of CO2 to the solution decreases the induction stage and also changes the overall transformation mechanism. Previously published data show that the induction stage is affected by the temperature of the reaction and the surface area and mineralogy of the reactant. The induction stage is often the slowest part of the overall transformation. Characteristics of natural dolomites that are consistent with the experimental results include the following: (1) Dolomite selectively replaces fine crystalline CaCO3; (2) most carbonate rocks are 100% dolomite or 100% calcite; (3) limestone-dolomite contacts are usually sharp and involve a decrease in the number of dolomite rhombs, but the size of the rhombs remains constant; (4) dolomite in completely dolomitized rocks is more stoichiometric than dolomite in partially dolomitized rocks; (5) aragonite is selectively dolomitized in modern sabkha sediments; and (6) modern dolomite is most abundant in areas of elevated Mg/Ca ratio or HCO3−. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.