Abstract
The study of the influence of microorganisms on the formation of deep- and shallow-water ore deposits is a promising topic in environmental science. This problem, along with the role of organic matter in the growth of Fe-Mn nodules, remains understudied. This study focuses on the analysis of the composition and content of fatty acids in fast-growing Fe-Mn deposits and underlying sediments from various regions of the Kara Sea. Fatty acids serve as important biomarkers of diagenetic processes and reflect the different origins of organic matter. This work is based on the results of lipid extract analysis using GC–MS. Various sources of fatty acids were identified, including plankton, bacteria, terrestrial plants, and detrital material. It was found that FA content depends on the size of the nodules. Compared to underlying sediments, Fe-Mn nodules are enriched in FAs of bacterial and detrital origin, with SAFAs > MUFAs and a negligible content of PUFAs.
Published Version
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