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    Changes in Sediment Accumulation Rate in an Oxbow Lake Following Late 19th Century Clearing of Land for Agricultural Use: A 210Pb, 137Cs, and 14C Study in Mississippi, USA

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    Author
    Davidson, Gregg R.
    Carnley, Meredith
    Lange, Todd
    Galicki, Stanley J.
    Douglas, Andrew
    Issue Date
    2004-01-01
    Keywords
    absolute age
    alkali metals
    Belzoni Mississippi
    C 14
    carbon
    Cenozoic
    cesium
    chronostratigraphy
    cores
    Cs 137
    dates
    deforestation
    Holocene
    human activity
    Humphreys County Mississippi
    isotopes
    lead
    metals
    Mississippi
    paleoenvironment
    paludal environment
    Pb 210
    Quaternary
    radioactive isotopes
    sedimentation
    sedimentation rates
    sediments
    Sky Lake
    terrestrial environment
    United States
    upper Holocene
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    Citation
    Davidson, G. R., Carnley, M., Lange, T., Galicki, S. J., & Douglas, A. (2004). Changes in sediment accumulation rate in an oxbow lake following late 19th century clearing of land for agricultural use: a 210Pb, 137Cs, and 14C study in Mississippi, USA. Radiocarbon, 46(2), 755-764.
    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/10150/654749
    DOI
    10.1017/S0033822200035797
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Sediment cores were collected from 2 sites in the forested fringe of an oxbow lake surrounded by land that was converted from forest to agricultural use in the late 19th century. The 2 sampling areas were selected to represent areas of high (West site) and low (east site) current sediment accumulation rates, based on distance from a perennially discharging stream. Modern (post settlement and land clearing) sediment accumulation rates were calculated using 210Pb and 137Cs on bulk sediment samples from 2 cores from each site. Two additional cores were collected from each site for radiocarbon analysis of twig cellulose with the assumption that most twigs in the sediment within the forested fringe fell from overhead and are contemporaneous with the sediment. Only the West site, however, yielded sufficient identifiable twig material for analysis. Modern sediment accumulation rates based on 210P and 137Cs fall between 0.2-0.4 cm/yr at the East site, and 0.7-1.3 cm/yr at the West site (nearest the stream inlet), with approximate agreement between the 210Pb and 137Cs methods. Modern sediment accumulation rate based on bomb-pulse 14C activity of twigs from cores from the West site is approximately 1.0 cm/yr, in agreement with the 210Pb and 137Cs results results. Historic sediment accumulation rates were estimated at the West site using twigs from deeper intervals with pre-bomb 14C activity. Sediment covering approximately 1000 yr of pre-settlement sediment accumulation exhibited evidence of minor bioturbation or in-washing of reworked material, but with a clearly lower accumulation rate of less than 0.1 cm/yr.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200035797
    Scopus Count
    Collections
    Radiocarbon, Volume 46, Number 2 (2004)

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