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Journal of the Geological Society; 1999; v. 156; issue.3; p. 515-525;
DOI: 10.1144/gsjgs.156.3.0515
© 1999 Geological Society of London

Article

Upper Pleistocene loess stratigraphy in the southern Yenisei Siberia area

MANFRED FRECHEN1 & ANATOLY F. YAMSKIKH2

1 Centre for Environmental Change & Quaternary Research, GEMRU, Francis Close Hall, Swindon Road, Cheltenham GL50 4AZ, UK (e-mail: MFrechen{at}chelt.ac.uk)
2 Department of Geoecology, Krasnoyarsk State University, Svobodny 79, 660041 Krasnoyarsk, Russia (e-mail: yamskikh{at}edk.krasnoyarsk.su)

The loess-like sediments along the river Yenisei provide a detailed palaeoclimatic archive of the last interglacial/glacial cycle for the southern part of Central Siberia. The loess-like sediments were formed by aeolian, alluvial, lacustrine–alluvial, slope wash and flood processes. Chernozem or chernozem-like palaeosols formed during the interglacial and interstadials. The loess-like sediments and palaeosols at the sections of Tatysh and Cholnokovo near Krasnoyarsk and Berezov were investigated with thermolumi-nescence and infrared optically stimulated luminescence dating methods. Luminescence dating suggests that the oldest sediments below the lowermost chernozem formed during the penultimate glaciation. It is likely that the lowermost chernozem at the Tatysh, Cholnokovo and Berezov sections formed during oxygen isotope stage 5. A large hiatus occurs above and below this lowermost chernozem, indicating that most of the last interglacial and early glacial record is missing in the sections investigated.

The intercalated duplicate chernozem-like palaeosols in the upper part of the section formed during an interstadial within oxygen isotope stage 3, indicating forest-steppe climatic conditions between 25 and 35 ka BP. The youngest loess-like sediments, overlying the duplicate palaeosol horizon, apparently have a very high sediment-accumulation rate.

Key Words: Quaternary • Siberia • loess • luminescence dating • palaeoclimates