Calcium isotope fractionation during microbially induced carbonate mineral precipitation
Calcium isotope fractionation during microbially induced carbonate mineral precipitation
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DOI：
10.1016/j.gca.2020.03.014
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发表时间：
2020-05
影响因子：
5
通讯作者：
H. Bradbury;K. Halloran;Chin Yik Lin;A. Turchyn
中科院分区：
文献类型：
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作者：
H. Bradbury;K. Halloran;Chin Yik Lin;A. Turchyn
本文报道了海洋硫酸盐还原菌脱硫弧菌（Desulfovibrio bizertensis）在微生物诱导碳酸钙矿物沉淀过程中的钙同位素分馏。这些数据被用来探讨如何在微生物引起的碳酸盐矿物沉淀的钙同位素分馏因子不同的生物或非生物碳酸盐矿物沉淀过程中的更好的约束钙同位素分馏因子。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δ 44 Ca的演变。微生物生长速率越快，碳酸盐矿物沉淀过程中钙同位素分馏越大，Δ 44 Ca（s-f）介于−1.07‰至−0.48‰之间。钙同位素分馏的研究有助于我们理解沉积成岩作用中碳酸盐矿物钙同位素分馏与微生物代谢之间的联系。
We report the calcium isotope fractionation during the microbially-induced precipitation of calcium carbonate minerals in pure cultures of the marine sulfate-reducing bacteriumDesulfovibrio 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.