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Microbial Kinetic Controls on Calcite Morphology in Supersaturated Solutions

Bosak, Tanja and Newman, Dianne K. (2005) Microbial Kinetic Controls on Calcite Morphology in Supersaturated Solutions. Journal of Sedimentary Research, 75 (2). pp. 190-199. ISSN 1527-1404. doi:10.2110/jsr.2005.015.

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Recognizing microbial imprints in the morphology of calcium carbonate minerals that form in very supersaturated solutions containing a high level of dissolved inorganic carbon (DIC) is challenging. To better define criteria for this purpose, we have analyzed the influence of sulfate-reducing bacterium Desulfovibrio desulfuricans strain G20 on the morphology of calcite in such solutions. G20 does not induce large shifts of pH or alkalinity under these conditions, but its uptake of millimolar sulfate and lactate decreases the number of anhedral crystals and stimulates growth of subhedral spar crystals relative to the abiotic controls. In addition, organic compounds associated with the basal growth medium, purified exopolymeric substances produced by G20 and lypopolysaccharide, stimulate the growth of anhedral crystals and crystals with rounded edges at low supersaturation index (SI) of calcite. The effect of organic compounds is reduced at higher SI, where rhombohedral habits dominate. Our results suggest that the local production and uptake of kinetic inhibitors within microbial biofilms may be an important control on calcite morphology in supersaturated solutions.

Item Type:Article
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Newman, Dianne K.0000-0003-1647-1918
Additional Information:© 2005 SEPM (Society for Sedimentary Geology). Received 9 October 2003; accepted 2 August 2004. We want to thank George Rossman and Ma Chi of the Division Analytical Center, Benjamin Weiss, Virginia Souza-Egipsy, Megan Ferguson and Nathan Dalleska, John Grotzinger, Andy Knoll, Bruce Fouke, Henry Chafetz, two anonymous reviewers, and the members of the Newman laboratory for their help, comments, and suggestions. This work was supported by grants from the Agouron Institute, the Luce Foundation, and the Packard Foundation.
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Agouron InstituteUNSPECIFIED
Clare Booth Luce FoundationUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20130327-092401068
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Official Citation: Tanja Bosak and Dianne K. Newman Microbial Kinetic Controls on Calcite Morphology in Supersaturated Solutions Journal of Sedimentary Research March 2005 75:190-199; published online April 14, 2005, doi:10.2110/jsr.2005.015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37645
Deposited By: Tony Diaz
Deposited On:15 Apr 2013 18:41
Last Modified:09 Nov 2021 23:30

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