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    An evaluation of 14C age relationships between co-occurring foraminifera, alkenones, and total organic carbon in continental margin sediments

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    2004PA001103.pdf (511.8Kb)
    Date
    2005-01-25
    Author
    Mollenhauer, Gesine  Concept link
    Kienast, Markus  Concept link
    Lamy, Frank  Concept link
    Meggers, Helge  Concept link
    Schneider, Ralph R.  Concept link
    Hayes, John M.  Concept link
    Eglinton, Timothy I.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/420
    As published
    https://doi.org/10.1029/2004PA001103
    DOI
    10.1029/2004PA001103
    Keyword
     Compound-specific radiocarbon dating; Alkenones; High accumulation rate sediments 
    Abstract
    Radiocarbon age relationships between co-occurring planktic foraminifera, alkenones and total organic carbon in sediments from the continental margins of Southern Chile, Northwest Africa and the South China Sea were compared with published results from the Namibian margin. Age relationships between the sediment components are site-specific and relatively constant over time. Similar to the Namibian slope, where alkenones have been reported to be 1000 to 4500 years older than co-occurring foraminifera, alkenones were significantly (~1000 yrs) older than co-occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2σ error or better) in the NW African and South China Sea sediments. Total-organic-matter and alkenone ages were similar off Namibia (age difference TOC-alkenones: 200-700 years), Chile (100-450 years), and NW Africa (360-770 years), suggesting minor contributions of pre-aged terrigenous material. In the South China Sea total organic carbon is significantly (2000-3000 yrs) older due to greater inputs of pre-aged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as sea-floor morphology, shelf width, and sediment composition, may control the age of co-occurring 2 sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. Age offsets are correlated with organic richness, suggesting that formation of organic aggregate is a key process.
    Description
    Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 20 (2005): PA1016, doi:10.1029/2004PA001103.
    Collections
    • Geology and Geophysics (G&G)
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Paleoceanography 20 (2005): PA1016
     

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