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    Orogenic climax of Earth: The 1.2-1.1 Ga Grenvillian superevent

    Access Status
    Fulltext not available
    Authors
    Van Kranendonk, M.
    Kirkland, Chris
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Van Kranendonk, M. and Kirkland, C. 2013. Orogenic climax of Earth: The 1.2-1.1 Ga Grenvillian superevent. Geology. 41 (7): pp. 735-738.
    Source Title
    Geology
    DOI
    10.1130/G34243.1
    ISSN
    0091-7613
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/15973
    Collection
    • Curtin Research Publications
    Abstract

    The rate of growth of the continental crust is controversial. We present an evaluation of time-constrained analyses of oxygen isotopes in zircon grains and incompatible element (Zr, Th) concentrations in magmatic rocks to test for variations in the degree of crustal recycling through geological time. The data indicate a rise in these geochemical proxies from ca. 3.0 Ga to a statistically significant peak at 1.2–1.1 Ga during the amalgamation of supercontinent Rodinia, and a decrease thereafter. When combined with other geological and geophysical observations, the data are interpreted as a consequence of an unprecedented level of crustal recycling and sediment subduction during Rodinia assembly, arising from a “Goldilocks” (i.e., just right) combination of larger, thicker plates on a warmer Earth with more rapid continental drift relative to modern Earth. The subsequent decrease in δ18O, Zr, and Th measurements is interpreted to reflect decreasing drift rates on a cooling Earth.

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