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    Extreme magnesium isotope fractionation at outcrop scale records the mechanism and rate at which reaction fronts advance

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    Syros Mg JPet final_with-tables-figs-appendix.pdf (2.354Mb)
    Date
    2014-10
    Author
    Pogge von Strandmann, Philip A. E.  Concept link
    Dohmen, Ralf  Concept link
    Marschall, Horst R.  Concept link
    Schumacher, John C.  Concept link
    Elliott, Tim  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7176
    As published
    https://doi.org/10.1093/petrology/egu070
    Keyword
     Diffusion; Isotope; Metasomatism; Monomineralic 
    Abstract
    Isotopic fractionation of cationic species during diffusive transport provides novel means of constraining the style and timing of metamorphic transformations. Here we document a major (~1‰) decrease in the Mg isotopic composition of the reaction front of an exhumed contact between rocks of subducted crust and serpentinite, in the Syros mélange zone. This isotopic perturbation extends over a notable length-scale (~1 m), implicating diffusion of Mg through an intergranular fluid network over a period of ~100 kyr. These novel observations confirm models of diffusion-controlled growth of reaction zones formed between rocks of contrasting compositions, such as found at the slab-mantle interface in subduction zones. The results also demonstrate that diffusive processes can result in exotic stable isotope compositions of major elements with implications for mantle xenoliths and complex intrusions.
    Description
    Author Posting. © The Author(s), 2014. This is the author's version of the work. It is posted here by permission of Oxford University Press for personal use, not for redistribution. The definitive version was published in Journal of Petrology 56 (2015): 33-58, doi:10.1093/petrology/egu070.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Pogge von Strandmann, Philip A. E., Dohmen, Ralf, Marschall, Horst R., Schumacher, John C., Elliott, Tim, "Extreme magnesium isotope fractionation at outcrop scale records the mechanism and rate at which reaction fronts advance", 2014-10, https://doi.org/10.1093/petrology/egu070, https://hdl.handle.net/1912/7176
     

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