Pedogenesis in loess-paleosol series on the Khovaling loess plateau during the MIS ۱ - MIS ۱۵ (Obi-Mazar section)

سال انتشار: 1402
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 70

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شناسه ملی سند علمی:

IQA06_028

تاریخ نمایه سازی: 13 آبان 1403

چکیده مقاله:

Significant thicknesses, a large number of paleosols and an impressive chronological framework put the loess-paleosol series of the Afghan-Tajik depression on a par with the famous sections of the Loess Plateau of China. The study of the most significant sections of the Khovaling Loess Plateau allows developing a chronostratigraphic scheme for the whole Central Asian region, reconstruct the structure and conditions for the periods of paleosol formation. The Obi-Mazar section is located opposite the Lakhuti village on the north-western bank of Obi-Mazar River in the Khovaling region of Southern Tajikistan. The bank represents a ۱۵۰ m high outcrop composed of subaerial deposits ~۸۰ m thick underlain by pebbles, sandy and clayey alluvium. Based on the results of field stratigraphy, description of the macro- and micromorphological structure, field magnetic susceptibility measurements, study of the chemical and grain size composition, a comprehensive characterization of the structure, properties, and formation conditions of paleosol and loess horizons was carried out. One loess and upper pedocomplex (PC۱) units are distinguished in the Late and Pleistocene deposits of the Obi-Mazar section. The pedocomplex PC۱, consisting of three paleosols, according to the stratigraphic position and absolute dating, corresponds to the MIS ۵ stage. Six loess units and PC۲-PC۶ are distinguished in the Middle Pleistocene deposits. These sediments are characterized by high silt and carbonate content and the presence of loess with pedogenic features. Soil formation during the interglacial periods of Pleistocene occurred in semi-humid and humid conditions under forest vegetation. The loess units were deposited in cold and arid conditions (glacials) while the paleosols were developed in warm and humid periods (interglacials). The properties of the studied paleosols together with the modern soils distribution in the region allow reconstrucing the soil type of PC۱ and PC۲ of the Obi-Mazar section with the genesis of Calcisols - Luvisols - Kastanozems group. The work is supported by the Russian Science Foundation (№۲۲-۱۸-۰۰۵۶۸) and the NordForsk THOCA project (№۱۰۵۲۰۴).

کلیدواژه ها:

Late and Middle Pleistocene ، Tajik depression ، calcareous soils ، micromorphology

نویسندگان

O.A Tokareva

Institute of Geography RAS, Moscow, Russia

M.P Lebedeva

Institute of Archeology and Ethnography SB RAS, Novosibirsk, Russia

P.M Sosin

V.V. Dokuchaev Soil Science Institute RAS, Moscow, Russia

F Khormali

Gorgan University of Agricultural Sciences and Natural Resources, Iran

R.N Kurbanov

Institute of Geography RAS, Moscow, Russia- Institute of Archeology and Ethnography SB RAS, Novosibirsk, Russia- Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia