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    The Mid-Pliocene sea-level conundrum: Glacial isostasy, eustasy and dynamic topography

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    Authors
    Rovere, A.
    Raymo, M.
    Mitrovica, J.
    Hearty, P.
    O'Leary, Mick
    Inglis, J.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Rovere, A. and Raymo, M. and Mitrovica, J. and Hearty, P. and O'Leary, M. and Inglis, J. 2014. The Mid-Pliocene sea-level conundrum: Glacial isostasy, eustasy and dynamic topography. Earth and Planetary Science Letters. 387: pp. 27-33.
    Source Title
    Earth and Planetary Science Letters
    DOI
    10.1016/j.epsl.2013.10.030
    ISSN
    0012821X
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/49117
    Collection
    • Curtin Research Publications
    Abstract

    Determining eustatic sea level during the Mid-Pliocene warm period (~3.3 to 2.9 Ma) has been a central but elusive goal in the study of past warm climates. Estimates of eustatic sea level based on geologic data span a broad range; variation that we now recognize is due in part to geographically varying post-depositional displacement caused by glacial isostatic adjustment and dynamic topography. In this study, we combine field observations and glacial isostatic adjustment modeling to estimate the dynamic topography signal in three areas that are important to paleo-sea level studies of the Mid-Pliocene warm period (South Africa, West Australia and southeastern United States). We show that dynamic topography played a significant role in the post-depositional displacement of Pliocene, and even younger Pleistocene, shorelines. In this regard, we provide a robust paleo-sea level elevation data set, corrected for glacial isostatic adjustment, that can be used to evaluate predictions from mantle flow models of dynamic topography.

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