Reconstructing Permafrost Sedimentological Characteristics and Post-depositional Processes of the Yedoma Stratotype Duvanny Yar, Siberia

Cryogenic weathering is a key driver of periglacial sediment composition and properties. Selective mineral-grain caused by freeze-thaw cycles in permafrost environments has the ability to dominate this process, leading silt-rich grain-size distributions. The cryogenic index (CWI) promising tool quantify freezing conditions. It considers low resistance quartz compared feldspars. Using approach, study aims decipher post-depositional reconstructing late Pleistocene Yedoma origins stratotype exposure Duvanny Yar. To estimate recent environmental endmember determine initial mineral until freezing, distribution CWI active layer was studied. In addition CWI, we studied composition, heavy distribution, grain size morphology. We suggest that likely altered polygenetic deposits (fluvial, nival, colluvial, lacustrine, alluvial, aeolian processes) during ground ice accumulation. Moreover, found two peaks - Holocene sediments at boundaries between glacial interglacial ages. conclusion, see Yar facies varied but also with suggesting changes formation. Nevertheless, processes like have influenced characteristics should be considered paleoenvironmental reconstructions.