Paleozoic siliceous-ferruginous oxide sedimentary rocks of the Urals massive sulfde deposits contain well-preserved textural and structural evidence indicating the role of microorganisms in their formation. Filamentous, rod-shaped, spherical and tubular micron-scale bacterial forms mineralized with hematite, hematite-siliceous and siliceous material are described. The flamentous forms are morphologically dominant. Authigenic apatite, Mn-calcite, Ti oxides, illite and rare earth minerals (phosphates and carbonates) are constantly associated with bacteriomorphic structures. The structures of fossil bacteria based on their size, shape, cell division, distribution in colonies and comparison with ferruginous sediments of modern hydrothermal systems and massive sulfde deposits worldwide indicate that they correspond to mineralized stalks of iron bacteria Leptothrix ochracea and Gallionella ferruginea, coccoidal forms and sulfur-oxidizing Thiobacillus Ferrooxidans and giant Beggiatoa-like organisms. These observations indicate bacterial biocatalysis in the processes of halmyrolysis of sulfdes and hyaloclasts during the formation of iron oxide deposits.

Received 21.08.2024, revised 11.10.2024, accepted 25.10.2024

Keywords: microbial structures, mineralized bioflms and glycocalyx, ferruginous oxide sedimentary rocks, massive sulfde deposits.

Funding. Field trips were conducted in frame of state contract no. 122031600292-6. The mineralogical study was supported by the Russian Science Foundation (project no. 22-17-00215).

Acknowledgements. The author is grateful to the Candidate of Geological–Mineralogical sciences O.P. Shilovsky for SEM images.

Confict of interest. The author declare that she has no conficts of interest.

Author contribution. Conceptualization, investigation, analytical works, writing – original draft, visualization, writing – review & editing.
For citation: Ayupova N.R. Microbial diversity in siliceous-ferruginous sedimentary rocks from the Urals massive sulfde deposits: a review. Mineralogy, 2024, 10(4), 41–59. DOI: 10.35597/2313-545X-2024-10-4-2

N.R. Ayupova, South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, Miass, Chelyabinsk region, 456317 Russia; aupova@mineralogy.ru

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