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    Th-230 normalization : an essential tool for interpreting sedimentary fluxes during the late Quaternary

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    2003PA000939.pdf (472.8Kb)
    Date
    2004-03-05
    Author
    Francois, Roger  Concept link
    Frank, Martin  Concept link
    Rutgers van der Loeff, Michiel M.  Concept link
    Bacon, Michael P.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3426
    As published
    https://doi.org/10.1029/2003PA000939
    DOI
    10.1029/2003PA000939
    Keyword
     Paleoflux; Sediment focusing; Paleoproductivity 
    Abstract
    There is increasing evidence indicating that syndepositional redistribution of sediment on the seafloor by bottom currents is common and can significantly affect sediment mass accumulation rates. Notwithstanding its common incidence, this process (generally referred to as sediment focusing) is often difficult to recognize. If redistribution is near synchronous to deposition, the stratigraphy of the sediment is not disturbed and sediment focusing can easily be overlooked. Ignoring it, however, can lead to serious misinterpretations of sedimentary fluxes, particularly when past changes in export flux from the overlying water are inferred. In many instances, this problem can be resolved, at least for sediments deposited during the late Quaternary, by normalizing to the flux of 230Th scavenged from seawater, which is nearly constant and equivalent to the known rate of production of 230Th from the decay of dissolved 234U. We review the principle, advantages and limitations of this method. Notwithstanding its limitations, it is clear that 230Th normalization does provide a means of achieving more accurate interpretations of sedimentary fluxes and eliminates the risk of serious misinterpretations of sediment mass accumulation rates.
    Description
    Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 19 (2004): PA1018, doi:10.1029/2003PA000939.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Paleoceanography 19 (2004): PA1018
     
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