Serpentine Stability to Mantle Depths and Subduction-Related Magmatism

DOI Web Site 被引用文献78件
  • Peter Ulmer
    Institut fOr Mineralogie und Petrographie, Eidgenössiche Technische Hochschule-Zentrum, CH-8092 Zürich, Switzerland
  • Volkmar Trommsdorff
    Institut fOr Mineralogie und Petrographie, Eidgenössiche Technische Hochschule-Zentrum, CH-8092 Zürich, Switzerland

抄録

<jats:p> Results of high-pressure experiments on samples of hydrated mantle rocks show that the serpentine mineral antigorite is stable to ∼720°C at 2 gigapascals, to ∼690°C at 3 gigapascals, and to ∼620°C at 5 gigapascals. The breakdown of antigorite to forsterite plus enstatite under these conditions produces 13 percent H <jats:sub>2</jats:sub> O by weight to depths of 150 to 200 kilometers in subduction zones. This H <jats:sub>2</jats:sub> O is in an ideal position for ascent into the hotter, overlying mantle where it can cause partial melting in the source region for calc-alkaline magmas at a depth of 100 to 130 kilometers and a temperature of ∼1300°C. The breakdown of antigorite in hydrated mantle produces an order of magnitude more H <jats:sub>2</jats:sub> O than does the dehydration of altered oceanic crust. </jats:p>

収録刊行物

  • Science

    Science 268 (5212), 858-861, 1995-05-12

    American Association for the Advancement of Science (AAAS)

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