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Título del libro: Arctic, Subarctic: Mosaic, Contrast, Variability Of The Cryosphere
Título del capítulo: Paleopedological Cryo Trasology: Soil Indicators of the Late Pleistocene Cryolithogenesis in Europe and Western Siberia

Autores UNAM:
SERGUEI SEDOV;
Autores externos:

Idioma:

Año de publicación:
2015
Palabras clave:

cryopedogenesis; paleopedological cryotrasology; paleocryogenic environments; Pleistocene


Resumen:

Soils are dynamic component of the cryolithosphere characterized by frequent phase transitions within the system ``ice - water - vapor''. Cryolithogenesis interacts with the pedogenetic processes forming a set of specific features in the solid matrix of soils. These features are preserved in the buried paleosols where they could be used as indicators of the past cryogenic environment. Cryopedologic indicators are subdivided in two groups: 1) those whose formation directly involves ice and 2) those produced by pedogenetic processes which could develop under the ice-free conditions but are strongly modified in the environment with negative temperatures. Both types are used for paleolandscape reconstructions of the cold periods of the Pleistocene, in particular - those of the last glacial-interglacial cycle (Marine Isotope Stages - MIS5 - 2) including documentation of interstadials. Direct indicator - lenticular cryogenic texture helped to document the early stages of cooling at the end of MIS5e in the profile of Mikulino paleosols in the Kursk region. Indirect indicators like gleying developed in the soils due to presence of permafrost were used to characterise the MIS3-MIS2 transition in the Austrian loess-paleosol exposures. Both types of indicators were used also to study late-Karga paleosols in the Middle Ob basin.


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