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    Continental flood basalts derived from the hydrous mantle transition zone

    231330_231330.pdf (1000.Kb)
    Access Status
    Open access
    Authors
    Wang, Xuan-Ce
    Wilde, Simon
    Li, Q.
    Yang, Y.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wang, X. and Wilde, S. and Li, Q. and Yang, Y. 2015. Continental flood basalts derived from the hydrous mantle transition zone. Nature Communications. 6: Article ID 7700.
    Source Title
    Nature Communications
    DOI
    10.1038/ncomms8700
    School
    Department of Applied Geology
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140100826
    Remarks

    This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by/4.0/

    URI
    http://hdl.handle.net/20.500.11937/30077
    Collection
    • Curtin Research Publications
    Abstract

    It has previously been postulated that the Earth's hydrous mantle transition zone may play a key role in intraplate magmatism, but no confirmatory evidence has been reported. Here we demonstrate that hydrothermally altered subducted oceanic crust was involved in generating the late Cenozoic Chifeng continental flood basalts of East Asia. This study combines oxygen isotopes with conventional geochemistry to provide evidence for an origin in the hydrous mantle transition zone. These observations lead us to propose an alternative thermochemical model, whereby slab-triggered wet upwelling produces large volumes of melt that may rise from the hydrous mantle transition zone. This model explains the lack of pre-magmatic lithospheric extension or a hotspot track and also the arc-like signatures observed in some large-scale intracontinental magmas. Deep-Earth water cycling, linked to cold subduction, slab stagnation, wet mantle upwelling and assembly/breakup of supercontinents, can potentially account for the chemical diversity of many continental flood basalts.

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