Characterization and Modeling of Carbonates–Mountjoy Symposium 1
DOLOMITE, VERY HIGH-MAGNESIUM CALCITE, AND MICROBES—IMPLICATIONS FOR THE MICROBIAL MODEL OF DOLOMITIZATION
Published:January 01, 2017
Stephen E. Kaczmarek, Jay M. Gregg, David L. Bish, Hans G. Machel, Bruce W. Fouke, 2017. "DOLOMITE, VERY HIGH-MAGNESIUM CALCITE, AND MICROBES—IMPLICATIONS FOR THE MICROBIAL MODEL OF DOLOMITIZATION", Characterization and Modeling of Carbonates–Mountjoy Symposium 1, Alex J. Macneil, Jeff Lonnee, Rachel Wood
Download citation file:
Numerous field and laboratory studies over the past two decades claim that microbes catalyze nucleation and growth of dolomite at temperatures common in low-temperature geologic environments (25–60° C). However, a critical reexamination of the X-ray diffraction (XRD) data presented by these studies indicates that the laboratory products are not dolomite but rather a mixture of minerals, including very high-magnesium calcite (VHMC). Because VHMC can be “compositionally” indistinguishable from dolomite (i.e., 50 mol% MgCO3), the positions of the principal (104) XRD reflection for VHMC and dolomite can be identical. Nevertheless, published XRD patterns of products derived from microbial...