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Russian Geology and Geophysics

2010 year, number 2

THE LATE PLEISTOCENE–HOLOCENE CLIMATE HISTORY IN THE WESTERN TODZHA BASIN ( Eastern Tuva )

S.G. Arzhannikova, S.V. Alekseeva, A.V. Glyzinb, N.V. Kulaginaa, N.V. Ignatovaa, and L.A. Orlovac
a Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, 128 ul. Lermontova, Irkutsk, 664033, Russia
bMuseum of Lake Baikal, Siberian Branch of the Russian Academy of Sciences, 1 ul. Akademicheskaya, Listvyanka, 664520, Russia
cV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Paleoearthquake, damlake, lacustrine-fluvial deposits, fossil soil, frozen ground, ice wedge, Eastern Tuva
Pages: 163-175

Abstract

The Late Quaternary history of climate and deposition environments in the western Todzha basin has been reconstructed fr om the respective lacustrine and fluvial deposits. Data from sedimentary sections have provided clues to the causes and timing of sudden deposition changes, including those associated with Holocene tectonic activity in the Taskyl fault. Especially informative are permafrost, diatom, spore-pollen, and tree-ring data from a section at the Merzlyi Yar locality, wh ere frozen ground has preserved the pristine rhythmic pattern of sediments. The Merzlyi Yar section stores a record of dramatic consequences of large earthquakes generated by the fault, which produced a large damlake. The revealed pattern of discontinuous limnic deposition, with prominent tree markers and syngenetic ice wedges, places exact constraints on the stratigraphy of the section and allows its correlation with Holocene climate events within the intervals of fossil soils and vegetation.