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    Decoding Earth's rhythms: Modulation of supercontinent cycles by longer superocean episodes

    Access Status
    Fulltext not available
    Authors
    Li, Z.
    Mitchell, R.
    Spencer, Christopher
    Ernst, R.
    Pisarevskiy, Sergei
    Kirscher, Uwe
    Murphy, J.
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Li, Z. and Mitchell, R. and Spencer, C. and Ernst, R. and Pisarevskiy, S. and Kirscher, U. and Murphy, J. 2019. Decoding Earth's rhythms: Modulation of supercontinent cycles by longer superocean episodes. Precambrian Research. 323: pp. 1-5.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2019.01.009
    ISSN
    0301-9268
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FL150100133
    URI
    http://hdl.handle.net/20.500.11937/74063
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 The supercontinent cycle of episodic assembly and breakup of almost all continents on Earth is commonly considered the longest period variation to affect mantle convection. However, global zircon Hf isotopic signatures and seawater Sr isotope ratios suggest the existence of a longer-term variation trend that is twice the duration of the supercontinent cycle. Here we propose that since ~2 billion years ago the superocean surrounding a supercontinent, as well as the circum-supercontinent subduction girdle, survive every second supercontinent cycle. This interpretation is in agreement with global palaeogeography and is supported by variations in passive margin, orogen, and mineral deposit records that each exhibits both ~500–700 million years periodic signal and a 1000–1500 million years variation trend. We suggest that the supercontinent cycle is modulated by an assembly that alternates between dominantly extroversion after a more complete breakup, and dominantly introversion after an incomplete breakup of the previous supercontinent.

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