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    The effect of ilmenite viscosity on the dynamics and evolution of an overturned lunar cumulate mantle

    265554.pdf (841.6Kb)
    Access Status
    Open access
    Authors
    Zhang, Nan
    Dygert, N.
    Liang, Y.
    Parmentier, E.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, N. and Dygert, N. and Liang, Y. and Parmentier, E. 2017. The effect of ilmenite viscosity on the dynamics and evolution of an overturned lunar cumulate mantle. Geophysical Research Letters. 44 (13): pp. 6543-6552.
    Source Title
    Geophysical Research Letters
    DOI
    10.1002/2017GL073702
    ISSN
    0094-8276
    School
    School of Earth and Planetary Sciences (EPS)
    Remarks

    Copyright © 2017 The American Geophysical Union

    URI
    http://hdl.handle.net/20.500.11937/68141
    Collection
    • Curtin Research Publications
    Abstract

    Lunar cumulate mantle overturn and the subsequent upwelling of overturned mantle cumulates provide a potential framework for understanding the first-order thermochemical evolution of the Moon. Upwelling of ilmenite-bearing cumulates (IBCs) after the overturn has a dominant influence on the dynamics and long-term thermal evolution of the lunar mantle. An important parameter determining the stability and convective behavior of the IBC is its viscosity, which was recently constrained through rock deformation experiments. To examine the effect of IBC viscosity on the upwelling of overturned lunar cumulate mantle, here we conduct three-dimensional mantle convection models with an evolving core superposed by an IBC-rich layer, which resulted from mantle overturn after magma ocean solidification. Our modeling shows that a reduction of mantle viscosity by 1 order of magnitude, due to the presence of ilmenite, can dramatically change convective planform and long-term lunar mantle evolution. Our model results suggest a relatively stable partially molten IBC layer that has surrounded the lunar core to the present day.

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