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    Primary U distribution in scleractinian corals and its implications for U series dating

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    2005GC001138.pdf (3.078Mb)
    Date
    2006-05-24
    Author
    Robinson, Laura F.  Concept link
    Adkins, Jess F.  Concept link
    Fernandez, Diego P.  Concept link
    Burnett, Donald S.  Concept link
    Wang, S.-L.  Concept link
    Gagnon, Alexander C.  Concept link
    Krakauer, Nir  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/1046
    As published
    https://doi.org/10.1029/2005GC001138
    DOI
    10.1029/2005GC001138
    Keyword
     Uranium; Diagenesis; Coral; Dating 
    Abstract
    In this study we use microsampling techniques to explore diagenetic processes in carbonates. These processes are important as they can affect the accuracy of U series chronometry. Fission track maps of deep-sea scleractinian corals show a threefold difference between the minimum and maximum [U] in modern corals, which is reduced to a factor of 2 in fossil corals. We use micromilling and MC-ICP-MS to make detailed analyses of the [U] and δ234Uinitial distributions in corals from 218 ka to modern. Within each fossil coral we observe a large range of δ234Uinitial values, with high δ234Uinitial values typically associated with low [U]. A simple model shows that this observation is best explained by preferential movement of alpha-decay produced 234U atoms (alpha-recoil diffusion). Open-system addition of 234U may occur when alpha-recoil diffusion is coupled with a high [U] surface layer, such as organic material. This process can result in large, whole-coral δ234Uinitial elevations with little effect on the final age. The diagenetic pathways that we model are relevant to both shallow-water and deep-sea scleractinian corals since both exhibit primary [U] heterogeneity and may be subject to U addition.
    Description
    Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 7 (2006): Q05022, doi:10.1029/2005GC001138.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Geochemistry Geophysics Geosystems 7 (2006): Q05022
     

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