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    14C Dating of Peat and delta-18O-delta-D in Ground Ice from Northwest Siberia

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    Author
    Vasil'chuk, Y. K.
    Jungner, Högne
    Vasil'chuk, A. C.
    Issue Date
    2001-01-01
    Keywords
    tundra
    D H
    Tyumen Russian Federation
    Yamal
    Yamal Nenets Russian Federation
    frozen ground
    northwestern Siberia
    thawing
    ground ice
    ice
    deuterium
    O 18 O 16
    hydrogen
    oxygen
    isotope ratios
    Holocene
    Russian Federation
    Siberia
    peat
    Commonwealth of Independent States
    sediments
    Asia
    Cenozoic
    Quaternary
    C 14
    carbon
    dates
    isotopes
    radioactive isotopes
    stable isotopes
    absolute age
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    Citation
    Vasil'chuk, Y. K., Jungner, H., & Vasil'chuk, A. C. (2001). 14C dating of peat and delta-18O-delta-D in ground ice from Northwest Siberia. Radiocarbon, 43(2B), 527-540.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 17th International Radiocarbon Conference held in Jerusalem, Israel, June 18-23, 2000.
    URI
    http://hdl.handle.net/10150/654399
    DOI
    10.1017/S0033822200041187
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    We present new radiocarbon dates from a number of Holocene peat deposits along a north-south transect across the Yamal Peninsula. The samples were collected from frozen peat deposits with large ice wedges in: the northern tundra near Seyaha Settlement, in the Central Yamal Peninsula, the southern tundra in Shchuch'ya River valley at the Edem'yaha mouth, the southern part of the Yamal Peninsula, and the southern forest tundra near Labytnangi Town. 14C dates of wood remains from the tundra in the Yamal Peninsula could be used to reconstruct a northern limit of forest during the Holocene Optimum. The wood layers at the bottom of the peat give evidence for immigration of trees further north beyond the present boundary. The first forest appearance in the Seyaha River valley area is dated about 9 ka BP according to the oldest peat date in the Seyaha cross section. This suggests that summer temperatures were higher than at present. Very fast accumulation of peat (around 5 m/ka: about 9-8 ka BP at Seyaha and about 7-6 ka BP at Shchuch'ya) also supports this observation. In contrast, oxygen isotope composition of Holocene syngenetic ice wedges from the area (delta-18O = -19.1 to -20.3 per mil in the Seyaha cross-section and -17.3 to -20.3 per mil in the Shchuch'ya River) show that winter temperatures were significantly lower than presently, i.e. The climate during the Holocene Optimum was slightly more continental. The frozen peat near Labytnangi has thawed during the last 20 years, indicating global warming.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200041187
    Scopus Count
    Collections
    Radiocarbon, Volume 43, Number 2B (2001)

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