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    The return of subducted continental crust in Samoan lavas

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    jackson et al_ Nature 2007.pdf (3.127Mb)
    Date
    2007-08-04
    Author
    Jackson, Matthew G.  Concept link
    Hart, Stanley R.  Concept link
    Koppers, Anthony A. P.  Concept link
    Staudigel, Hubert  Concept link
    Konter, Jasper G.  Concept link
    Blusztajn, Jerzy S.  Concept link
    Kurz, Mark D.  Concept link
    Russell, Jamie A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/2075
    As published
    https://doi.org/10.1038/nature06048
    Abstract
    Substantial quantities of terrigenous sediments are known to enter the mantle at subduction zones, but little is known about their fate in the mantle. Subducted sediment may be entrained in buoyantly upwelling plumes and returned to the earth’s surface at hotspots, but the proportion of recycled sediment in the mantle is small and clear examples of recycled sediment in hotspot lavas are rare. We report here remarkably enriched 87Sr/86Sr and 143Nd/144Nd isotope signatures (up to 0.720830 and 0.512285, respectively) in Samoan lavas from three dredge locations on the underwater flanks of Savai’i island, Western Samoa. The submarine Savai’i lavas represent the most extreme 87Sr/86Sr isotope compositions reported for ocean island basalts (OIBs) to date. The data are consistent with the presence of a recycled sediment component (with a composition similar to upper continental crust, or UCC) in the Samoan mantle. Trace element data show similar affinities with UCC—including exceptionally low Ce/Pb and Nb/U ratios—that complement the enriched 87Sr/86Sr and 143Nd/144Nd isotope signatures. The geochemical evidence from the new Samoan lavas radically redefines the composition of the EM2 (enriched mantle 2) mantle endmember, and points to the presence of an ancient recycled UCC component in the Samoan plume.
    Description
    Author Posting. © Nature Publishing Group, 2007. This is the author's version of the work. It is posted here by permission of Nature Publishing Group for personal use, not for redistribution. The definitive version was published in Nature 448 (2007): 684-687, doi:10.1038/nature06048.
    Collections
    • Geology and Geophysics (G&G)
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Jackson, Matthew G., Hart, Stanley R., Koppers, Anthony A. P., Staudigel, Hubert, Konter, Jasper G., Blusztajn, Jerzy S., Kurz, Mark D., Russell, Jamie A., "The return of subducted continental crust in Samoan lavas", 2007-08-04, https://doi.org/10.1038/nature06048, https://hdl.handle.net/1912/2075
     
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