Journal
JOURNAL OF SEDIMENTARY RESEARCH
Volume 70, Issue 3, Pages 559-564Publisher
SEPM-SOC SEDIMENTARY GEOLOGY
DOI: 10.1306/2DC40928-0E47-11D7-8643000102C1865D
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The production of several: morphologies of magnesian calcite crystals by the soil bacterium Myxococcus xanthus is reported for the first time. Mg-calcite crystallization occurred in agar-agar gel culture media in the presence of the live bacteria. The agar-agar used to solidify the nutritive microbial solution acted as a porous system that allowed slow counterdiffusion of cations and, anions and of the bacterial metabolites produced. Under these conditions, crystal nucleation and growth occurs, apparently as a consequence of the localized ion supersaturation produced by the microbial metabolites and by microbial supply of heterogeneous nuclei for crystallization. Several morphologies of Mg-calcite typical of those formed under biotic and abiotic conditions developed simultaneously, The crystals produced were not com positionally zoned and showed no significant variation in Mg content, probably as a consequence of the sponge-hike character of the precipitates.
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