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Laboratory Experimental Study on the Formation of Authigenic Carbonates Induced by Microbes in Marine Sediments
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2021-04-29 , DOI: 10.3390/jmse9050479
Zilin Wei , Tianfu Xu , Songhua Shang , Hailong Tian , Yuqing Cao , Jiamei Wang , Zhenya Shi , Xiao Liu

Authigenic carbonates are widely distributed in marine sediments, microbes, and anaerobic oxidation of methane (AOM) play a key role in their formation. The authigenic carbonates in marine sediments have been affected by weathering and diagenesis for a long time, it is difficult to understand their formation process by analyzing the samples collected in situ. A pore water environment with 10 °C, 6 MPa in the marine sediments was built in a bioreactor to study the stages and characteristics of authigenic carbonates formation induced by microbes. In experiments, FeCO3 is formed preferentially, and then FeCO3-MgCO3 complete isomorphous series and a small part of CaCO3 isomorphous mixture are formed. According to this, it is proposed that the formation of authigenic carbonates performed by AOM and related microbes needs to undergo three stages: the rise of alkalinity, the preferential formation of a carbonate mineral, and the formation of carbonate isomorphous series. This work provides experimental experience and reference basis for further understanding the formation mechanism of authigenic carbonates in marine sediments.

中文翻译:

海洋沉积物中微生物诱导的自生碳酸盐形成的室内实验研究

自生碳酸盐广泛分布于海洋沉积物,微生物中,甲烷的厌氧氧化(AOM)在其形成过程中起关键作用。长期以来,海洋沉积物中的自生碳酸盐受到风化和成岩作用的影响,很难通过分析原位采集的样品来了解其形成过程。在生物反应器中建立了一个海洋沉积物中10°C,6 MPa的孔隙水环境,以研究微生物诱导的自生碳酸盐形成的阶段和特征。在实验中,FeCo系3优先形成,然后FeCo系3 -MgCO 3完全同晶系列和CaCO的一小部分3形成同质混合物。据此,提出由AOM和相关微生物进行的自生碳酸盐的形成需要经历三个阶段:碱度的升高,碳酸盐矿物的优先形成和碳酸盐同晶系列的形成。这项工作为进一步了解海洋沉积物中自生碳酸盐的形成机理提供了实验经验和参考依据。
更新日期:2021-04-29
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