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    Protracted timescales of lower crustal growth at the fast-spreading East Pacific Rise

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    Rioux_et_al_NG_2012.pdf (27.80Mb)
    Date
    2011-12
    Author
    Rioux, Matthew  Concept link
    Lissenberg, C. Johan  Concept link
    McLean, Noah M.  Concept link
    Bowring, Samuel A.  Concept link
    MacLeod, Christopher J.  Concept link
    Hellebrand, Eric  Concept link
    Shimizu, Nobumichi  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5181
    As published
    https://doi.org/10.1038/ngeo1378
    Abstract
    Formation of the oceanic crust at mid-ocean ridges is a fundamental component of plate tectonics. A majority of the crust at many ridges is composed of plutonic rocks that form by crystallization of mantle-derived magmas within the crust. Recent application of U/Pb dating to samples from in-situ oceanic crust has begun to provide exciting new insight into the timing, duration and distribution of magmatism during formation of the plutonic crust1-4. Previous studies have focused on samples from slow-spreading ridges, however, the time scales and processes of crustal growth are expected to vary with plate spreading rate. Here we present the first high-precision dates from plutonic crust formed at the fast-spreading East Pacific Rise (EPR). Individual zircon minerals yielded dates from 1.420–1.271 million years ago, with uncertainties of ± 0.006–0.081 million years. Within individual samples, zircons record a range of dates of up to ~0.124 million years, consistent with protracted crystallization or assimilation of older zircons from adjacent rocks. The variability in dates is comparable to data from the Vema lithospheric section on the Mid-Atlantic Ridge (MAR)3, suggesting that time scales of magmatic processes in the lower crust may be similar at slow- and fast-spreading ridges.
    Description
    Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Nature Publishing Group for personal use, not for redistribution. The definitive version was published in Nature Geoscience 5 (2012): 275-278, doi:10.1038/ngeo1378.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Rioux, Matthew, Lissenberg, C. Johan, McLean, Noah M., Bowring, Samuel A., MacLeod, Christopher J., Hellebrand, Eric, Shimizu, Nobumichi, "Protracted timescales of lower crustal growth at the fast-spreading East Pacific Rise", 2011-12, https://doi.org/10.1038/ngeo1378, https://hdl.handle.net/1912/5181
     
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