Bradbury, Harold J. and Halloran, Kathryn H. and Lin, Chin Yik and Turchyn, Alexandra V. (2020) Calcium isotope fractionation during microbially induced carbonate mineral precipitation. Geochimica Et Cosmochimica Acta, 277. pp. 37-51. ISSN 00167037, DOI https://doi.org/10.1016/j.gca.2020.03.014.
Full text not available from this repository.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.
| Item Type: | Article |
|---|---|
| Funders: | Seventh Framework Programme [Grant No: 307582], Natural Environment Research Council [Grant No: NE/R013519/1], National Eye Research Centre, European Research Council |
| Uncontrolled Keywords: | Calcite; Calcium carbonate; Diagenesis; Growth rate; Induced response; Isotopic fractionation; Precipitation (chemistry); Sulfate-reducing bacterium |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Science > Department of Geology |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 04 Nov 2024 03:09 |
| Last Modified: | 04 Nov 2024 03:09 |
| URI: | http://eprints.um.edu.my/id/eprint/36685 |
Actions (login required)
 |
View Item |
