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Calcium isotope fractionation during microbially induced carbonate mineral precipitation
Geochimica et Cosmochimica Acta ( IF 5 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.gca.2020.03.014
Harold J. Bradbury , Kathryn H. Halloran , Chin Yik Lin , Alexandra V. Turchyn

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.

中文翻译:

微生物诱导碳酸盐矿物沉淀过程中的钙同位素分馏

摘要 我们报告了在海洋硫酸盐还原细菌 Desulfovibrio bizertensis 的纯培养物中微生物诱导的碳酸钙矿物质沉淀过程中的钙同位素分馏。这些数据用于探索微生物诱导的碳酸盐矿物沉淀过程中的钙同位素分馏因子与生物或非生物碳酸盐矿物沉淀过程中约束较好的钙同位素分馏因子有何不同。然后用抗生素调节细菌生长,并在不同微生物生长速率下监测溶液中 δ44Ca 的演变。微生物生长速度越快,碳酸盐矿物沉淀过程中钙同位素分馏越大,Δ44Ca(sf)范围从-1.07‰到-0.48‰。
更新日期:2020-05-01
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