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    Domains of depleted mantle : new evidence from hafnium and neodymium isotopes

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    Article (687.4Kb)
    Data Set S1: The Hf and Nd isotopic compositions of the mid-ocean ridge basalts and ocean island basalts. (121Kb)
    Figure S1: Distribution of locations of mid-ocean ridge basalts which show correlation between Hf and Nd isotopic compositions. (1.541Mb)
    Additional file information (2.175Kb)
    Date
    2011-08-02
    Author
    Salters, Vincent J. M.  Concept link
    Mallick, Soumen  Concept link
    Hart, Stanley R.  Concept link
    Langmuir, Charles H.  Concept link
    Stracke, Andreas  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4790
    As published
    https://doi.org/10.1029/2011GC003617
    DOI
    10.1029/2011GC003617
    Keyword
     MORB; Hafnium; Isotopes; Neodymium 
    Abstract
    Isotope systematics of basalts provide information on the distribution of mantle components and the length scale of mantle heterogeneity. To obtain this information, high data and sampling density are crucial. We present hafnium and neodymium isotope data on more than 400 oceanic volcanics. Over length scales of several hundred to over one thousand kilometers hafnium and neodymium isotopes of mid-ocean ridge basalts are correlated and form an array of parallel trends on a global scale. On a larger scale these domains differ in the amount of highly depleted mantle material with radiogenic hafnium and neodymium isotope ratios. Compared to the Atlantic and Indian Ocean basins the asthenosphere of the Pacific basin seems to have a more uniform and a less radiogenic Hf isotopic composition for a given Nd isotopic composition. The parallel arrays of mid-ocean ridge basalts provide strong constraints on the makeup of the MORB mantle and are evidence for the presence of a highly depleted and highly radiogenic neodymium and hafnium component. This component, because of its highly depleted character, is unrecognized in the strontium-neodymium-lead isotope systems alone. Alternatively, the parallel arrays can have an ancient origin of systematic variations in the degree of depletion. Each array then represents the variations in this fossil melting regime. Individual ocean island basalt suites display different slopes in hafnium-neodymium isotope space, which are also best explained by varying amounts of highly residual mantle rather than isotopic differences in enriched mantle components as previously invoked. The ocean island basalt arrays diverge at the depleted end and project to radiogenic compositions that are similar to those of the asthenosphere through which they travel. This is strong evidence that the plume material interacts with its surrounding mantle as it ascends. The isotopic compositions of the ocean island and ridge basalts suggest that their systematics are influenced by a heretofore unrecognized depleted component.
    Description
    Author Posting. © American Geophysical Union, 2011. 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 12 (2011): Q08001, doi:10.1029/2011GC003617.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry Geophysics Geosystems 12 (2011): Q08001
     

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