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    The Swedish Time Scale: A Potential Calibration Tool for the Radiocarbon Time Scale During the Late Weichselian

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    Author
    Wohlfarth, Barbara
    Björck, Svante
    Possnert, Göran
    Issue Date
    1995-01-01
    Keywords
    planar bedding structures
    sedimentary structures
    varves
    upper Weichselian
    Weichselian
    calibration
    chronology
    accelerator mass spectroscopy
    mass spectroscopy
    spectroscopy
    Pleistocene
    upper Pleistocene
    time scales
    Europe
    Western Europe
    Scandinavia
    Sweden
    Cenozoic
    Quaternary
    methods
    geochronology
    C 14
    carbon
    isotopes
    radioactive isotopes
    absolute age
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    Citation
    Wohlfarth, B., Björck, S., & Possnert, G. (1995). The Swedish Time Scale: A potential calibration tool for the radiocarbon time scale during the Late Weichselian. Radiocarbon, 37(2), 347-359.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/653481
    DOI
    10.1017/S0033822200030824
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    The Swedish Time Scale (STS) is a ca. 13,300-yr-long varve chronology that has been established for the Swedish east coast from >1000 overlapping clay-varve diagrams. We describe the present state of the STS and illustrate the application of this worldwide unique varve chronology for AMS radiocarbon measurements. The results are compared to other 14C-dated calendar-year chronologies: dendrochronology, laminated lake sediments and U/Th. Our data set agrees with the oldest part of the dendrochronological calibration curve, and with AMS 14C-dated lake lamination data and U/Th on corals down to ca. 12 ka calendar years BP. Further back in time, the AMS-dated part of the STS partly compares well with lake lamination chronologies and shows that the difference between 14C and calendar years decreases rapidly between 12,600 and 12,800 calendar years BP. Such a development seems to contrast with U/Th measurements on corals. We suggest that the cause for the divergence among three supposed calendar-year chronologies lies in the fact that the data points on the marine 14C-U/ Th curve are more widely spaced in time than the tightly grouped set of terrestrial AMS 14C dates, and thus are not able to reflect short-term changes in atmospheric 14C. Therefore, we argue that the use of the pre-Holocene part of the calibration program is premature and inadvisable.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200030824
    Scopus Count
    Collections
    Radiocarbon, Volume 37, Number 2 (1995)

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