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dc.contributor.authorPogge von Strandmann, Philip A. E.  Concept link
dc.contributor.authorDohmen, Ralf  Concept link
dc.contributor.authorMarschall, Horst R.  Concept link
dc.contributor.authorSchumacher, John C.  Concept link
dc.contributor.authorElliott, Tim  Concept link
dc.date.accessioned2015-02-26T16:22:16Z
dc.date.available2016-01-01T09:33:04Z
dc.date.issued2014-10
dc.identifier.urihttps://hdl.handle.net/1912/7176
dc.descriptionAuthor 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.en_US
dc.description.abstractIsotopic 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.en_US
dc.description.sponsorshipAnalyses were funded by NERC grant NER/C510983/1. P.P.v.S. is supported by NERC Research Fellowship NE/I020571/1.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoenen_US
dc.relation.urihttps://doi.org/10.1093/petrology/egu070
dc.subjectDiffusionen_US
dc.subjectIsotopeen_US
dc.subjectMetasomatismen_US
dc.subjectMonomineralicen_US
dc.titleExtreme magnesium isotope fractionation at outcrop scale records the mechanism and rate at which reaction fronts advanceen_US
dc.typePreprinten_US
dc.description.embargo2016-01-01en_US


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