Microstructure and geochemical properties of modern and buried soils and hosting permafrost sediments of the Batagay retrogressive thaw slump

• DOI: 10.1017/qua.2024.58
• Publication Date: 2025-02-26T09:59:20Z
• Authors: A.V. Lupachev; N.I. Tananaev; J.B. Murton; P.I. Kalinin; V.V. Malyshev; P.P. Danilov

Abstract The paleopedology of the world’s largest retrogressive thaw slump, Batagay, is understudied. Micromorphological and geochemical analysis reveal properties th host sediments major pedogenic features. Epigenetic soil profiles Marine Oxygen Isotope Stage (MIS) 7 (or older) 5e are clearly distinguished well developed due to favorable bioclimatic conditions for pedogenesis, probably similar modern ones. oldest unit contains a paleosol Histic Reductaquic Cryosol, indicating peat-covered, boggy environment. MIS organic-rich Spodic Cryosol with well-developed structure, formed during interglacial optimum, which was relatively warm presumably resembled conditions. 4–3 deposits soil-like bodies enriched in coarse organogenic material resembling incipient Cryosols. Interglacial/interstadial units contain micromorphological evidence aggregate pore formation, Fe-oxide organic matter redistribution clay accumulation. Stadial show weakly expressed structure uneven aggregates, cryogenic disintegration plant detritus rare accumulation humic substances. Major elemental ratios indicate intensification biochemical weathering paleosols bodies. Pedogenically reworked stadial sedimentary sporadic provide significant source paleoenvironmental reconstruction harsh Late Pleistocene environments.