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Enhanced mantle-to-crust rhenium transfer in undegassed arc magmas

Sun, Weidong; Bennett, Victoria; Eggins, Stephen; Kamenetsky, Vadim S; Arculus, Richard

Description

Variations in the 187Os/188Os isotopic signature of mantle and mantle-derived rocks have been thought to provide a powerful chemical tracer of deep Earth structure. Many studies have inferred from such data that a long-lived, high-rhenium component exists in the deep mantle (187Re is the parent isotope decaying to 187Os, with a half-life of ∼42 billion years), and that this reservoir probably consists of subducted oceanic crust1-3. The interpretation of these isotopic signatures is, however,...[Show more]

dc.contributor.authorSun, Weidong
dc.contributor.authorBennett, Victoria
dc.contributor.authorEggins, Stephen
dc.contributor.authorKamenetsky, Vadim S
dc.contributor.authorArculus, Richard
dc.date.accessioned2015-12-13T23:12:03Z
dc.identifier.issn0028-0836
dc.identifier.urihttp://hdl.handle.net/1885/87869
dc.description.abstractVariations in the 187Os/188Os isotopic signature of mantle and mantle-derived rocks have been thought to provide a powerful chemical tracer of deep Earth structure. Many studies have inferred from such data that a long-lived, high-rhenium component exists in the deep mantle (187Re is the parent isotope decaying to 187Os, with a half-life of ∼42 billion years), and that this reservoir probably consists of subducted oceanic crust1-3. The interpretation of these isotopic signatures is, however, dependent on accurate estimates of rhenium and osmium concentrations in all of the main geochemical reservoirs, and the crust has generally been considered to be a minor contributor to such global budgets. In contrast, we here present observations of high rhenium concentrations and low Yb/Re ratios in arc-type melt inclusions. These results indicate strong enrichment of rhenium in undegassed arc rocks, and consequently the continental crust, which results in a crustal estimate of ∼2 p.p.b. rhenium, as compared to previous estimates of 0.4-0.2 p.p.b. (refs 4, 5). Previous determinations of rhenium in arc materials, which were largely measured on subaerially erupted samples, are likely to be in error owing to rhenium loss during degassing. High mantle-to-crust rhenium fluxes, as observed here, require a revaluation of geochemical models based on the 187Re-187Os decay system1-3.
dc.publisherMacmillan Publishers Ltd
dc.sourceNature
dc.subjectKeywords: Isotopes; Osmium; Rhenium; Rocks; Arc magmas; Geochemistry; osmium; radioisotope; rhenium; degassing; island arc; magma chemistry; mantle chemistry; osmium isotope; rhenium; accuracy; article; decomposition; geochemistry; priority journal; reservoir; rock
dc.titleEnhanced mantle-to-crust rhenium transfer in undegassed arc magmas
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume422
dc.date.issued2003
local.identifier.absfor040304 - Igneous and Metamorphic Petrology
local.identifier.absfor040305 - Marine Geoscience
local.identifier.ariespublicationMigratedxPub17336
local.type.statusPublished Version
local.contributor.affiliationSun, Weidong, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBennett, Victoria, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationEggins, Stephen, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKamenetsky, Vadim S, University of Tasmania
local.contributor.affiliationArculus, Richard, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage294
local.bibliographicCitation.lastpage297
local.identifier.doi10.1038/nature01482
dc.date.updated2015-12-12T08:30:12Z
local.identifier.scopusID2-s2.0-0037456796
CollectionsANU Research Publications

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