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    Evidence for melting mud in Earth’s mantle from extreme oxygen isotope signatures in zircon.

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    Authors
    Spencer, Christopher J.
    Cavosie, Aaron J.
    Raub, Timothy D.
    Rollinson, Hugh cc
    Jeon, Heejin
    Searle, Michael P.
    Miller, Jodie A.
    McDonald, Bradley J.
    Evans, Noreen J.
    Affiliation
    Curtin University
    University of St Andrews
    University of Derby
    University of Western Australia
    University of Oxford
    Stellenbosch University
    Issue Date
    2017-10-02
    
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    Other Titles
    Melting mud in Earth's mantle
    Abstract
    Melting of subducted sediment remains controversial, as direct observation of sediment melt generation at mantle depths is not possible. Geochemical fingerprints provide indirect evidence for subduction delivery of sediment to the mantle; however, sediment abundance in mantle-derived melt is generally low (0%–2%), and difficult to detect. Here we provide evidence for melting of subducted sediment in granite sampled from an exhumed mantle section. Peraluminous granite dikes that intrude peridotite in the Oman–United Arab Emirates ophiolite have U-Pb ages of 99.8 ± 3.3 Ma that predate obduction. The dikes have unusually high oxygen isotope (δ18O) values for whole rock (14–23‰) and quartz (20–22‰), and yield the highest δ18O zircon values known (14–28‰; values relative to Vienna standard mean ocean water [VSMOW]). The extremely high oxygen isotope ratios uniquely identify the melt source as high-δ18O marine sediment (pelitic and/or siliciceous mud), as no other source could produce granite with such anomalously high δ18O. Formation of high-δ18O sediment-derived (S-type) granite within peridotite requires subduction of sediment to the mantle, where it melted and intruded overlying mantle wedge. The granite suite described here contains the highest oxygen isotope ratios reported for igneous rocks, yet intruded mantle peridotite below the Mohorovičić seismic discontinuity, the most primitive oxygen isotope reservoir in the silicate Earth. Identifying the presence and quantifying the extent of sediment melting within the mantle has important implications for understanding subduction recycling of supracrustal material and effects on mantle heterogeneity over time.
    Citation
    C.J. Spencer, A.J. Cavosie, T.D. Raub, H. Rollinson, H. Jeon, M.P. Searle, J.A. Miller, B.J. McDonald, N.J. Evans, ; Evidence for melting mud in Earth’s mantle from extreme oxygen isotope signatures in zircon. Geology ; 45 (11): 975–978. doi:10.1130/G39402.1
    Publisher
    Geological Society of America
    Journal
    Geology
    URI
    http://hdl.handle.net/10545/621958
    DOI
    10.1130/G39402.1
    Additional Links
    https://doi-org.ezproxy.derby.ac.uk/10.1130/G39402.1
    Type
    Article
    Language
    en
    ISSN
    00917613
    ae974a485f413a2113503eed53cd6c53
    10.1130/G39402.1
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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