Landscape development in response to climatic change during Oxygen Isotope Stage 5 in the southern Siberian loess region

Chlachula, Jiri and Kemp, Rob A. and Jessen, Catherine A. and Palmer, Adrian P. and Toms, Phillip S. (2004) Landscape development in response to climatic change during Oxygen Isotope Stage 5 in the southern Siberian loess region. Boreas, 33 (2). pp. 164-180. ISSN 03009483

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Abstract

Two high-resolution loess-palaeosol sections from the Ob Loess Plateau (Iskitim) and the Minusinsk Basin (Kurtak 33) provide new detailed information on the last interglacial climate variations and landscape development in the parkland-steppe zone of southern Siberia. The complete last interglacial sensu lato (130–74 ka BP) records of the two sites, documented by magnetic susceptibility, grain-size, CaCO3 and organic carbon content as proxy climatic data, and supplemented by thin-section studies, indicate several short warm and very cold intervals correlated with OIS 5e-5a. A strongly continental warm climate culminated around the peak of the last interglacial sensu stricto (OIS 5e) and cooler conditions occurred during the following interstadial stages (OIS 5c and 5a), corresponding to shifts in palaeolandscape development with gradual replacement of parkland-steppe and mixed southern taiga by boreal forest. During stadial stages (OIS 5d and 5b), the palaeolandscape was transformed into a cold arid periglacial tundra-steppe. Evidence for a major cooling in Siberia during OIS 5d, corroborating the palaeolimnological record from Lake Baikal, is provided by deep frost-wedge casts distorting the OIS 5e chernozemic palaeosol, suggesting formation of permafrost shortly after the last interglacial climatic optimum. The pedosedimentary record, reflecting the effects of syndepositional pedogenic processes, attests to a dynamic climate pulsation during the last interglacial stage.

Item Type: Article
Article Type: Article
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Schools and Research Institutes > School of Natural & Social Sciences > Environmental Sciences
Research Priority Areas: Environmental Dynamics & Governance
Depositing User: Phillip Toms
Date Deposited: 11 Nov 2015 12:04
Last Modified: 11 Nov 2015 12:04
URI: http://eprints.glos.ac.uk/id/eprint/2813

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