Calcium isotope fractionation during microbially induced carbonate mineral precipitation

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 0016-7037 DOI https://doi.org/10.1016/j.gca.2020.03.014

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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
Uncontrolled Keywords:	2020AREP; IA76
Subjects:	01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions:	01 - Climate Change and Earth-Ocean Atmosphere Systems 12 - PhD 08 - Green Open Access
Journal or Publication Title:	Geochimica Et Cosmochimica Acta
Volume:	277
Page Range:	pp. 37-51
Identification Number:	https://doi.org/10.1016/j.gca.2020.03.014
Depositing User:	Sarah Humbert
Date Deposited:	08 Apr 2020 17:34
Last Modified:	08 Apr 2020 17:50
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4676

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