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    Stepped-Combustion 14C Dating of Bomb Carbon in Lake Sediment

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    Author
    McGeehin, J.
    Burr, G. S.
    Hodgins, G.
    Bennett, S. J.
    Robbins, J. A.
    Morehead, N.
    Markewich, H.
    Issue Date
    2004-01-01
    Keywords
    absolute age
    alkali metals
    C 14
    calibration
    carbon
    cesium
    combustion
    cores
    corrections
    Cs 137
    Grenada County Mississippi
    Grenada Lake
    isotopes
    lacustrine environment
    lake sediments
    metals
    methods
    Mississippi
    modern
    radioactive isotopes
    sample preparation
    sediments
    United States
    Yalobusha County Mississippi
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    Citation
    McGeehin, J., Burr, G. S., Hodgins, G., Bennett, S. J., Robbins, J. A., Morehead, N., & Markewich, H. (2004). Stepped-combustion 14C dating of bomb carbon in lake sediment. Radiocarbon, 46(2), 893-900.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 18th International Radiocarbon Conference held in Wellington, New Zealand, September 1-5, 2003.
    URI
    http://hdl.handle.net/10150/654953
    DOI
    10.1017/S0033822200035931
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    In this study, we applied a stepped-combustion approach to dating post-bomb lake sediment from north-central Mississippi. Samples were combusted at a low temperature (400 degrees C) and then at 900 degrees C. The CO2 was collected separately for both combustions and analyzed. The goal of this work was to develop a methodology to improve the accuracy of 14C dating of sediment by combusting at a lower temperature and reducing the amount of reworked carbon bound to clay minerals in the sample material. The 14C fraction modern results for the low and high temperature fractions of these sediments were compared with well-defined 137Cs determinations made on sediment taken from the same cores. Comparison of "bomb curves" for 14C and 137Cs indicate that low temperature combustion of sediment improved the accuracy of 14C dating of the sediment. However, fraction modern results for the low temperature fractions were depressed compared to atmospheric values for the same time frame, possibly the result of carbon mixing and the low sedimentation rate in the lake system.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200035931
    Scopus Count
    Collections
    Radiocarbon, Volume 46, Number 2 (2004)

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