Dolomite selectivity and mimic replacement

Research Article| November 01, 1984 Dolomite selectivity and mimic replacement Susan B. Bullen; Susan B. Bullen 1Department of Geological Sciences, Michigan State University, East Lansing, Michigan 48824-1115 Search for other works by this author on: GSW Google Scholar 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 Author and Article Information Susan B. Bullen 1Department of Geological Sciences, Michigan State University, East Lansing, Michigan 48824-1115 Duncan F. Sibley 1Department of Geological Sciences, Michigan State University, East Lansing, Michigan 48824-1115 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1984) 12 (11): 655–658. https://doi.org/10.1130/0091-7613(1984)12<655:DSAMR>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Susan B. Bullen, Duncan F. Sibley; Dolomite selectivity and mimic replacement. Geology 1984;; 12 (11): 655–658. doi: https://doi.org/10.1130/0091-7613(1984)12<655:DSAMR>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 Dolomite can (1) selectively replace certain components of a rock such as coralline algae and (2) mimically replace certain fossils such as echinoid fragments. We dolomitized coralline alga, echinoid, foram, pelecypod, Halimeda, gastropod and coral fragments at 250 °C in two-molar CaCl2/MgCl2 solutions and found that coralline algae, echinoids, Halimedae, and forams dolomitized faster than the other fossils.Echinoids and forams were mimically replaced, whereas pelecypods, gastropods, and corals were replaced by dolomite, which destroyed the original skeletal architecture. Artificial conversion of high-Mg calcite coralline algae and echinoid fragments to low-Mg calcite prior to dolomitization had no discernible effect on the rate of dolomitization or the fabric of the dolomitized fossils.On the basis of these results and petrographic analyses of natural, low-temperature dolomites, we conclude that mimic replacement and fossil selective replacement is more likely to be affected by the crystal size than by mineralogy. 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.