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Geology; December 2000; v. 28; no. 12; p. 1091-1094; DOI: 10.1130/0091-7613(2000)28<1091:BIDPIA>2.0.CO;2
© 2000 Geological Society of America
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Bacterially induced dolomite precipitation in anoxic culture experiments

Rolf Warthmann*,1, Yvonne van Lith*,1, Crisógono Vasconcelos*,1, Judith A. McKenzie*,1 and Anne Marie Karpoff*,2

1 Laboratory of Geomicrobiology, Geological Institute, ETH-Zentrum, 8092 Zürich, Switzerland
2 EOST—Centre de Géochimie de la Surface CNRS-UMR 7517, F-67084 Strasbourg, France

To study the process of microbial-mediated dolomite formation, growth experiments were carried out with selected bacterial cultures under anoxic environmental conditions simulating those found in Lagoa Vermelha, a hypersaline lagoon in Brazil where dolomite precipitation occurs. Specifically, we report the isolation of a particular strain of sulfate-reducing bacteria, LVform6, from Lagoa Vermelha sediment, which apparently promotes the formation of nonstoichiometric dolomite. Sulfate-reducing bacteria grown in a synthetic liquid medium produced dolomite during 30 days incubation at 30 °C. The precipitates have morphologies similar to those observed in Lagoa Vermelha sediment. Our results demonstrate that sulfate-reducing bacteria can influence dolomite precipitation under controlled low-temperature, anoxic conditions, and imply that anaerobic microorganisms can play an important role in carbonate sedimentation. They may have been particularly significant in Earth's earliest history when a more reducing atmosphere existed.

Key Words: dolomite • microbial mediation • sulfate-reducing bacteria • dumbbell morphology • anoxic hypersaline environment




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