M. R. Latypova, A. G. Kalmykov, V. V. Churkina, E. V. Karpova, N. S. Balushkina, G. A. Kalmykov
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引用次数: 0
Abstract—The geochemical and lithological features of bacterial–algal structures from the top of the Abalak and Georgia Formations in the central part of Western Siberia were studied in order to determine the specific conditions of their formation. The authors compared the element composition of these microbial carbonates with the secondary carbonate rocks of the Abalak and Georgia formations. According to the results of X-ray fluorescence analysis, differences were identified in the contents of MnO, Cr, V, Ni, Cu, and Zn in two types of carbonates. The higher content of MnO in bacterial–algal structures were explained by the ability of bacteria to sorb Mn on the surface of their cells. This process requires oxygen, which suggests the presence of a natural aerobic environment for the development of bacteria during the period of sediment accumulation. According to the results of the study of microbial carbonates under a scanning electron microscope, it was revealed that Mn, for the most part, is concentrated in carbonate minerals, in particular in kutnohorite. The increased content of biophilic elements such as Ni, Cu, Zn, V in microbial carbonates, is probably associated with the transformation of humic organic matter, that was accumulated in shallow water environments and was actively recycled by microbial organisms. Minerals with the high Ba concentration were also found in isolated bacterial–algal structures. According to the authors, such single barium mineralization could be caused by the point effect of both near-surface and deep-seated barium-containing solutions and are not associated with an increased content of manganese in the studied deposits.
摘要 研究了西西伯利亚中部阿巴拉克地层和格鲁吉亚地层顶部细菌-藻类结构的地球化学和岩石学特征，以确定其形成的具体条件。作者将这些微生物碳酸盐的元素组成与阿巴拉克地层和格鲁吉亚地层的次生碳酸盐岩进行了比较。根据 X 射线荧光分析的结果，两种碳酸盐中氧化锰、铬、钒、镍、铜和锌的含量存在差异。细菌-藻类结构中氧化锰含量较高的原因是细菌能够在其细胞表面吸附锰。这一过程需要氧气，这表明在沉积物堆积期间存在细菌发展的天然好氧环境。根据在扫描电子显微镜下对微生物碳酸盐的研究结果显示，锰大部分都集中在碳酸盐矿物中，特别是在库特诺霍尔岩中。镍、铜、锌、钒等亲生物元素在微生物碳酸盐中的含量增加，可能与腐殖质有机物的转化有关，这些有机物在浅水环境中积累，并被微生物积极循环利用。在孤立的细菌-藻类结构中也发现了高浓度钡的矿物。作者认为，这种单一的钡矿化可能是由近地表和深层含钡溶液的点效应造成的，与所研究矿床中锰含量的增加无关。
期刊介绍：
Moscow University Geology Bulletin is the journal that mainly publishes scientific articles, short reports of graduate students, and reviews. Publications made by the members of the Faculty of Geology of the Moscow State University and their collaborators are published. Publications encompass all branches of geology.
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