Genesis, evolution, and catastrophic burying of the Ryshkovo paleosol of the Mikulino Interglacial (MIS 5e)
Por:
Sycheva, S. A., Sedov, S. N., Bronnikova, M. A., Targulian, V. O., Solleiro-Rebolledo, E.
Publicada:
1 sep 2017
Resumen:
The results of a hierarchical morphogenetic, physicochemical, and
mineralogical study of the Ryshkovo full-profile texture-differentiated
paleosol of the Mikulino Interglacial from the section at Aleksandrov
quarry in Kursk oblast are discussed. The correlation analysis of the
stratigraphy of this section with global geological records made it
possible to determine the position of the Ryshkovo paleosol in the
chronostratigraphic system of the Late Pleistocene and to attribute it
to stage MIS 5e; the duration of pedogenesis for this paleosol was no
more than 12-15 ka. The results of the study indicate that the Ryshkovo
paleosol is close in its properties to the Holocene soddy-podzolic soils
of the East European Plain. No direct evidences in favor of the former
interpretation of this paleosol as a lessivated soil genetically close
to Luvisols of nemoral broadleaved forest of Central Europe have been
found. The difference between the paleosol of the Mikulino Interglacial
and the modern soddy-podzolic soils is mainly related to the
distribution of clay coatings. In the upper part of the illuvial horizon
of Mikulino paleosol, clay coatings are few in number, and typical
tongues of podzolized (albic) material are absent in the profile. At the
same time, silty coatings (skeletans) are abundant even in the lower
part of the illuvial horizon. In general, the Mikulino paleosol is
characterized by a smaller diversity of clay pedofeatures. These
differences might be related to less contrasting fluctuations of the
environmental conditions in the second half of the Mikulino
Interglacial, to the periodical renewal of the eluvial part of Mikulino
paleosol by erosional and accumulative processes, and to the absence of
anthropogenic impacts on the soil during the Mikulino Interglacial. The
burying of the Ryshkovo paleosol took place due to the intense
development of erosional processes induced by the contrasting climatic
events at the end of the interglacial period accompanied by catastrophic
forest fires and sharp cooling of the climate upon the transition to the
Valdai glaciation.
Filiaciones:
Sycheva, S. A.:
Russian Acad Sci, Inst Geog, Per Staromonetnyi 29, Moscow 119017, Russia
Sedov, S. N.:
Univ Nacl Autonoma Mexico, Inst Geol, Ciudad Univ, Mexico City 04510, DF, Mexico
Tyumen State Univ, Ul Volodarskogo 6, Tyumen 625003, Russia
Tyumen Ind Univ, Ul Volodarskogo 38, Tyumen 625000, Russia
Bronnikova, M. A.:
Russian Acad Sci, Inst Geog, Per Staromonetnyi 29, Moscow 119017, Russia
Targulian, V. O.:
Russian Acad Sci, Inst Geog, Per Staromonetnyi 29, Moscow 119017, Russia
Solleiro-Rebolledo, E.:
Univ Nacl Autonoma Mexico, Inst Geol, Ciudad Univ, Mexico City 04510, DF, Mexico
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