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    Using the N/C ratio to correct bulk radiocarbon ages from lake sediments : insights from Chilean Patagonia

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    Bertrand et al - Bulk radiocarbon - Quat Geoch.pdf (3.481Mb)
    Date
    2012-06-12
    Author
    Bertrand, Sebastien  Concept link
    Araneda, Alberto  Concept link
    Vargas, Patricia  Concept link
    Jana, Patricia  Concept link
    Fagel, Nathalie  Concept link
    Urrutia, Roberto  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5621
    As published
    https://doi.org/10.1016/j.quageo.2012.06.003
    Keyword
     Old carbon; Age model; Soil organic matter; Chronology 
    Abstract
    The offset between AMS radiocarbon ages obtained on bulk lake sediments and the true age of deposition was evaluated at four sites in Northern Chilean Patagonia. Our results show that the bulk radiocarbon ages are systematically older by 300 to 1100 years. In this region free of carbonate and carbonaceous rocks, we argue that this difference results from variable inputs of terrestrial organic carbon from the Holocene soils that cover the lake watersheds. For the four studied lakes, the age offset is clearly related to the fraction of terrestrial carbon preserved in the lake sediments, which was estimated using the N/C ratio of the bulk organic matter. We propose that N/C measurements can be used to significantly improve chronologies based on radiocarbon dating of bulk lake sediments.
    Description
    Author Posting. © The Author(s), 2012. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Quaternary Geochronology 12 (2012): 23-29, doi:10.1016/j.quageo.2012.06.003.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Bertrand, Sebastien, Araneda, Alberto, Vargas, Patricia, Jana, Patricia, Fagel, Nathalie, Urrutia, Roberto, "Using the N/C ratio to correct bulk radiocarbon ages from lake sediments : insights from Chilean Patagonia", 2012-06-12, https://doi.org/10.1016/j.quageo.2012.06.003, https://hdl.handle.net/1912/5621
     

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