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Sulphate‐reducing bacteria induce low‐temperature Ca‐dolomite and high Mg‐calcite formation

Sulphate‐reducing bacteria induce low‐temperature Ca‐dolomite and high Mg‐calcite formation ABSTRACT In this study, we demonstrate that sulphate‐reducing bacteria induce anoxic low‐temperature Ca‐dolomite formation both in situ in Lagoa Vermelha and Brejo do Espinho, two neighbouring, dolomite‐precipitating hypersaline lagoons in Brazil, and in laboratory culture experiments. The metabolic activity of sulphate‐reducing bacteria facilitates dolomite formation under anoxic conditions, as demonstrated with experiments using dialysis bags. Overall changes in the chemical conditions of the medium exclusively, without the presence of bacteria, did not result in carbonate precipitation. Only pure cultures of metabolizing sulphate‐reducing bacteria induced Ca‐dolomite and high Mg‐calcite precipitates, indicating that the carbonate nucleation takes place in the locally changed microenvironment around the sulphate‐reducing bacterial cells. Not all pure strains, however, produced Ca‐dolomite under similar conditions, suggesting that the bacterial metabolism, activity and the rate of mineral precipitation have an influence on the type of carbonate formed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geobiology Wiley

Sulphate‐reducing bacteria induce low‐temperature Ca‐dolomite and high Mg‐calcite formation

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References (28)

Publisher
Wiley
Copyright
Copyright © 2003 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1472-4677
eISSN
1472-4669
DOI
10.1046/j.1472-4669.2003.00003.x
Publisher site
See Article on Publisher Site

Abstract

ABSTRACT In this study, we demonstrate that sulphate‐reducing bacteria induce anoxic low‐temperature Ca‐dolomite formation both in situ in Lagoa Vermelha and Brejo do Espinho, two neighbouring, dolomite‐precipitating hypersaline lagoons in Brazil, and in laboratory culture experiments. The metabolic activity of sulphate‐reducing bacteria facilitates dolomite formation under anoxic conditions, as demonstrated with experiments using dialysis bags. Overall changes in the chemical conditions of the medium exclusively, without the presence of bacteria, did not result in carbonate precipitation. Only pure cultures of metabolizing sulphate‐reducing bacteria induced Ca‐dolomite and high Mg‐calcite precipitates, indicating that the carbonate nucleation takes place in the locally changed microenvironment around the sulphate‐reducing bacterial cells. Not all pure strains, however, produced Ca‐dolomite under similar conditions, suggesting that the bacterial metabolism, activity and the rate of mineral precipitation have an influence on the type of carbonate formed.

Journal

GeobiologyWiley

Published: Jul 1, 2003

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