Calcium isotope fractionation during microbially induced carbonate mineral precipitation
Document Type
Article
Publication Date
5-1-2020
Abstract
We report the calcium isotope fractionation during the microbially-induced precipitation of calcium carbonate minerals in pure cultures of the marine sulfate-reducing bacterium Desulfovibrio bizertensis. These data are used to explore how the calcium isotope fractionation factor during microbially-induced carbonate mineral precipitation differs from the better-constrained calcium isotope fractionation factors during biogenic or abiotic carbonate mineral precipitation. Bacterial growth was then modulated with antibiotics, and the evolution of δ44Ca in solution was monitored under different microbial growth rates. The faster the microbial growth rate, the larger the calcium isotope fractionation during carbonate mineral precipitation, with Δ44Ca(s-f) ranging from −1.07‰ to −0.48‰. The reported calcium isotope fractionation can help us understand the link between calcium isotope fractionation and microbial metabolism in carbonate minerals precipitated during sedimentary diagenesis.
Keywords
Calcite, Calcium carbonate, Diagenesis, Growth rate, Induced response, Isotopic fractionation, Precipitation (chemistry), Sulfate-reducing bacterium
Divisions
GEOLOGY
Funders
Seventh Framework Programme [Grant No: 307582],Natural Environment Research Council [Grant No: NE/R013519/1],National Eye Research Centre,European Research Council
Publication Title
Geochimica Et Cosmochimica Acta
Volume
277
Publisher
Pergamon-Elsevier Science Ltd
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND