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    Explosive eruptions at mid-ocean ridges driven by CO2-rich magmas

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    Date
    2011-02
    Author
    Helo, Christoph  Concept link
    Longpre, Marc-Antoine  Concept link
    Shimizu, Nobumichi  Concept link
    Clague, David A.  Concept link
    Stix, John  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4528
    As published
    https://doi.org/10.1038/ngeo1104
    Abstract
    The abundance of volatile compounds, and particularly 18 CO2, in the upper oceanic mantle affects the style of volcanic eruptions. At mid-ocean ridges, eruptions are generally dominated by the gentle effusion of basaltic lavas with a low volatile content. But, explosive volcanism has been documented at some ocean spreading centres1-3, indicative of abundant volatile compounds. Estimates of the initial CO2 concentration of primary magmas can be used to constrain the CO2 content of the upper oceanic mantle, but these estimates vary greatly4,5. Here we present ion microprobe measurements of the CO2 content of basaltic melt trapped in plagioclase crystals. The crystals are derived from volcanic ash deposits erupted explosively at Axial Seamount, Juan de Fuca Ridge, in the northeast Pacific Ocean. We report unusually high CO2 concentrations of up to 9,160 ppm, which indicate that the upper oceanic mantle is more enriched in carbon than previously thought. And we furthermore suggest that CO2 fluxes along mid-ocean ridges4,5 vary significantly. Our results demonstrate that elevated fluxes of CO2 from the upper oceanic mantle can drive explosive eruptions at mid-ocean ridges.
    Description
    Author Posting. © The Authors, 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 4 (2011): 260–263, doi:10.1038/ngeo1104.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Helo, Christoph, Longpre, Marc-Antoine, Shimizu, Nobumichi, Clague, David A., Stix, John, "Explosive eruptions at mid-ocean ridges driven by CO2-rich magmas", 2011-02, https://doi.org/10.1038/ngeo1104, https://hdl.handle.net/1912/4528
     
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