Sartanian (MIS 2) ice wedge pseudomorphs with hydromorphic pedosediments in the north of West Siberia as an indicator for paleoenvironmental reconstruction and stratigraphic correlationстатья
Статья опубликована в журнале из списка Web of Science и/или Scopus
Аннотация:Within the glacier-free scenario of the MIS 2 (Sartanian cryochron) environment in the north of West Siberia, it isimportant to search for the new regional paleoecological records and stratigraphic markers for this period. Westudied large ice-wedge pseudomorphs filled with gleyic pedosediments developed on the high river terraces inthe Nadym and Taz rivers basins as a tracer of the surface cryogenic and pedogenic processes during MIS 2. Fieldmorphological observations and measurements, palynological analysis and radiocarbon dating of organic matterfrom soils and pedosediments were performed. Two sets of paleoecological indicators were discriminated:pseudomorph geometry evidence of the processes and conditions of ice wedge formation during the Last GlacialMaximum whereas the paleopedological and paleobotanic results from the fills recorded the environments of icewedge melting at the end of MIS 2. Paleotemperatures 7–10 ◦C lower than at present are inferred during themajor part of Sartanian, even at its end continuous permafrost persisted providing development of swampytundra vegetation and cryohydromorphic palaeosols. We propose to define Taz-Nadym cryopedogenic horizon asa representative regional unit for MIS 2 and to correlate it with synchronous cryogenic and palaeosol units inCentral and Eastern Europe.
