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Structure and properties of paleosols of the last two interglacial cycles of the Khovaling Loess Plateau, Tajikistan (Obi–Mazar section)

Published online by Cambridge University Press:  13 January 2025

Olga A. Tokareva Open the ORCID record for Olga A. Tokareva [Opens in a new window] ,
Marina P. Lebedeva ,
Peter M. Sosin ,
Islomov K. Ashurmadov ,
Farhad Khormali  and
Redzhep N. Kurbanov Open the ORCID record for Redzhep N. Kurbanov [Opens in a new window]
Olga A. Tokareva*
Affiliation:
Institute of Geography RAS, Moscow, Russia Institute of Archeology and Ethnography SB RAS, Novosibirsk, Russia Gorgan University of Agricultural Sciences and Natural Resources, Iran
Marina P. Lebedeva
Affiliation:
V.V. Dokuchaev Soil Science Institute RAS, Moscow, Russia
Peter M. Sosin
Affiliation:
Institute of Water Problems, Hydropower and Ecology NAST, Dushanbe, Tajikistan
Islomov K. Ashurmadov
Affiliation:
Institute of History, Archeology and Ethnography of NAST, Dushanbe, Tajikistan
Farhad Khormali
Affiliation:
Gorgan University of Agricultural Sciences and Natural Resources, Iran
Redzhep N. Kurbanov
Affiliation:
Institute of Geography RAS, Moscow, Russia Institute of Archeology and Ethnography SB RAS, Novosibirsk, Russia Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
*
Corresponding author: Olga A. Tokareva; Email: gidroliss@gmail.com.
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Abstract

Significant thicknesses, a large number of paleosols, and an impressive chronological framework place the loess–paleosol series of the Afghan-Tajik depression on a par with the famous sections of the Chinese Loess Plateau. Based on the results of field stratigraphy, description of the macro- and micromorphological structure, field magnetic susceptibility measurements, and study of the chemical and grain-size compositions, a comprehensive characterization of the structure, properties, and formation conditions of paleosol horizons and loess layers was carried out. Three loess units and two pedocomplexes are distinguished in the late and upper middle Pleistocene deposits of the Obi-Mazar section. These sediments are characterized by high silt and carbonate content and the presence of loess with pedogenic features. Pedocomplex PC1, consisting of three paleosols, according to the stratigraphic position and absolute dating, corresponds to MIS 5. Pedocomplex PC2, consisting of two developed paleosols separated by loess, is correlated with MIS 7. The properties of the studied paleosols together with modern soil distribution in the region allow for the reconstruction of the soil type of PC1 and PC2 of the Obi-Mazar section with the genesis of the Calcisols–Kastanozems groups.

Keywords

Late and upper middle PleistoceneAfgan-Tajik depressioncalcareous soilsmicromorphologygrain-size analysis
Type
Research Article
Information
Quaternary Research , First View , pp. 1 - 17
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Copyright © The Author(s), 2025. Published by Cambridge University Press on behalf of Quaternary Research Center

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