Water and the Oxidation State of Subduction Zone Magmas

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  • Katherine A. Kelley
    Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882, USA.
  • Elizabeth Cottrell
    National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA.

Bibliographic Information

Published
2009-07-31
DOI
  • 10.1126/science.1174156
Publisher
American Association for the Advancement of Science (AAAS)

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Description

<jats:title>Tracing Mantle Oxidation</jats:title> <jats:p> The chemical composition of the Earth's mantle varies with tectonic setting. For example, basaltic melts near subduction zones are more oxidized than magma near divergent plate boundaries. <jats:bold>Kelley and Cottrell</jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="605" related-article-type="in-this-issue" vol="325" xlink:href="10.1126/science.1174156">605</jats:related-article> ; see the Perspective by <jats:bold> <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="5940" page="545" related-article-type="in-this-issue" vol="325" xlink:href="10.1126/science.1176882">Hirschmann</jats:related-article> </jats:bold> ) examined melts formed in different tectonic environments, using highly sensitive synchrotron-based analytical methods. The oxidation state of Fe increased with water content and mobile trace elements concentrations. Thus, fluids released from wet subducting plates drive mantle oxidation above subduction zones, which may help to explain the spatial differences in oxygen fugacity of the mantle. </jats:p>

Journal

  • Science

    Science 325 (5940), 605-607, 2009-07-31

    American Association for the Advancement of Science (AAAS)

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