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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Dolomite Growth in Coralline Algae
Seymour O. Schlanger
ABSTRACT
Thin-section study of dolomitized limestone of Eocene age from the subsurface of Eniwetok reveals the localization of dolomite crystals within segments of articulate coralline algae. Corals and large Foraminifera are little affected. The writer suggests, in view of recent work by others on the crystal chemistry and occurrence of high-magnesian calcite, that the dolomitized algae are the end product of the crystallographic ordering of the Ca-Mg solid solution that made up the original high-magnesian algal calcite. This ordering is thought to take place on scattered dolomite nuclei inherent in the original algal precipitate, these nuclei being the result of local concentrations of Mg ions within the algal calcite.
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