HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Web of Science (5) Citing Articles via Google Scholar Google Scholar Articles by Alekseev, A. Articles by Gradusov, B. Search for Related Content PubMed Articles by Alekseev, A. Articles by Gradusov, B. GeoRef GeoRef Citation Agricola Articles by Alekseev, A. Articles by Gradusov, B. Related Collections Soil Models Soil Mineralogy

DIVISION S-5—PEDOLOGY

Mineral Transformations in Permafrost-Affected Soils, North Kolyma Lowland, Russia

^a Institute of Physical Chemical and Biological Problems of Soil Science Russian Academy of Sciences, Pushchino, Moscow Region, Russia
^b Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany
^c V.V. Dokuchaev Soil Science Institute, Moscow, Russia

^* Corresponding author (alekseev{at}issp.serpukhov.su)

Soils in permafrost sediments were studied on the Kolyma Lowland, North-East Siberia. Mineral transformations were studied by comparing samples from different geochemical positions relative to the permafrost table. The profiles studied are developed from Yedoma deposits (mid to late Pleistocene). Mineralogical composition of study soils is controlled by the illite-chlorite mineralogy of the parent Yedoma deposits, climatic conditions (extremely cold and dry) and the effect of permafrost. Degradation of illite, weathering of Fe-containing minerals (chlorite) with further Fe migration within the active layer and its crystallization at the cryogenic barrier in the form of lepidocrocite are the main processes of mineral transformations in the Kriozems studied. The highest concentration of lepidocrocite is associated with the boundary of permanently frozen ground. Geochemical processes are strongly influenced by the permafrost table. The boundary between the seasonally thawing soil and the permanently frozen ground is an important geochemical barrier.