Paleoclimatic Indicators from Permafrost Sequences in the Eastern Taymyr Lowland

摘要: Permafrost sequences in the Labaz Lake area were investigated to reconstruct their paleoenvironmental history during Late Quaternary using geocryological field studies, sedimentological, geochemical, stable isotopic and palynological analyses connection with radiocarbon dating. The current results show that post-Zyryan (Early Weichselian) times denudation accumulation this was dominated by processes connected decay of an ice cover, formed at least Zyryan stadial. As a result specific peculiarities glacier thawing territory continuous, low- temperature permafrost, buried bodies preserved until present time. most intensive occurred first warming stage Kargin (Middle Interstadial more than 40000 yr BP. formation extensive lake depressions within glacial deposits is these times. About BP, surface stabilization occurred, syncryogenic thick polygonal wedges (Ice Complexes) peat beds formed. Subsequent phases, apparently increases precipitation, led new activation decay, additional lacustrine fluvio-lacustrine sediments. Palynological isotope data from ground suggest continual trend cooler continental climate Sartan stadial During maximal cooling period, dried-up At termination Pleistocene, sedimentation seems have reactivated reaction short improvements. Thermokarst lakes period. Extensive started end Boreal spread flat Atlantic. Since Subboreal, drying up gradual increasing permafrost aggradation can be inferred.