Relevance. Pyrite is one of the most widespread authigenic minerals both in methane fluid seepage zones and in marine sedimentary systems in general, highlighting its importance in early diagenetic processes. Studying the mechanisms of its formation and its role in the biogeochemical cycles of various chemical elements is critical for a deeper understanding of processes occurring in cold seep systems. Aim. To assess the impact of methane fluid seepage on the morphology and trace element composition of sedimentary pyrite. Methods. Scanning electron microscopy, transmission electron microscopy, X-ray microtomography, inductively coupled plasma mass spectrometry and laser ablation. Results and Conclusions. Based on morphological features, the following types of pyrite were identified: spherical and polygonal framboids, framboids with secondary radial overgrowths, rod-like aggregates, euhedral and subhedral pyrite crystals. Different textural types of pyrite prevail in the sediment and carbonate crusts, reflecting the influence of the host environment on its morphology. The association of pyrite with methane-derived carbonates, as well as its characteristic morphology, suggests the dominant role of sulfate-driven anaerobic oxidation of methane in sulfide formation at the studied site. The concentrations of redox-sensitive elements in the sediment, carbonate crusts, and pyrite indicate that pyrite serves as the important authigenic component accumulating some redox-sensitive elements. A comparison of the obtained results with published data on the trace element composition of sedimentary pyrite formed by organoclastic sulfate reduction revealed that pyrite at the studied site is enriched with all the considered trace elements.