Strength contrast between plagioclase and olivine at water-rich Moho depths

Shintaro Azuma, Ikuo Katayama, Ken Ichi Hirauchi, Shigeru Yamashita

    Research output: Contribution to journalLetterpeer-review

    1 Citation (Scopus)

    Abstract

    Strength contrast between plagioclase and olivine was tested utilizing two-layer deformation experiments under hydrous conditions at the pressure and temperature corresponding to the Moho (P = 1.0 GPa and T = 400-800 °C). Deformation microstructures characterized by lattice-preferred orientation and dislocation density indicate that both minerals were plastically deformed via dislocation-controlled creep. Our experimental results show that olivine is weaker than plagioclase at T = 400 °C, whereas plagioclase is weaker than olivine at T = 800 °C. Consequently, strength contrast between plagioclase and olivine is sensitive to temperature, and olivine may be weaker than plagioclase, or display almost no difference in strength between these materials under the wet continental Moho. This suggests that the "crème brulee"model, in which the upper mantle is weak and the strength is limited to the crust, is expected as a rheological layer model of the water-rich Moho conditions.

    Original languageEnglish
    Pages (from-to)286-290
    Number of pages5
    JournalJournal of Mineralogical and Petrological Sciences
    Volume105
    Issue number5
    DOIs
    Publication statusPublished - Oct 2010

    Keywords

    • Flow-law
    • Moho
    • Olivine
    • Plagioclase
    • Strength contrast
    • Strength profile

    ASJC Scopus subject areas

    • Geophysics
    • Geology

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