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    A lower crust origin of some flood basalts of the Emeishan large igneous province, SW China

    236284_236284.pdf (1.598Mb)
    Access Status
    Open access
    Authors
    Shellnutt, J.
    Usuki, T.
    Kennedy, Allen
    Chiu, H.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Shellnutt, J. and Usuki, T. and Kennedy, A. and Chiu, H. 2015. A lower crust origin of some flood basalts of the Emeishan large igneous province, SW China. Journal of Asian Earth Sciences. 109: pp. 74-85.
    Source Title
    Journal of Asian Earth Sciences
    DOI
    10.1016/j.jseaes.2015.04.037
    ISSN
    1367-9120
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/45615
    Collection
    • Curtin Research Publications
    Abstract

    High seismic velocity layers within the lower crust (i.e. ~40. km) of the Yangtze Block are interpreted as mafic underplated rocks derived from the Late Permian Emeishan mantle plume. However, the region experienced a previous magmatic event during the Neoproterozoic (~800. Ma) that produced the Kangdian basalts and associated mafic intrusions and therefore the lower crust seismic velocity layers may represent a mixture of two different magmatic episodes. The identification of inherited Neoproterozoic (i.e. ~750 to ~850. Ma) zircons within Emeishan magmatic rocks indicates either assimilation of older material during emplacement or that the rocks could be derived from a mafic Neoproterozoic precursor. Equilibrium partial melt modeling of Neoproterozoic Kangdian basalts can produce compositions similar to Emeishan basalt at a pressure of 1.2. GPa (i.e. ˜40. km depth). It is suggested that the injection of high temperature picritic magmas into the lower crust of the Yangtze Block could be sufficient to induce high degrees of melting of the lower crust and produce magmas that are similar in composition to some Emeishan mafic rocks and/or produce melts that could contaminate 'pristine' Emieshan magmas.

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