Influence of majorite on hot plumes

Hiroki Ichikawa, Masanori Kameyama, Hiroki Senshu, Kenji Kawai, Shigenori Maruyama

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    The influence of MgSiO3 majorite on mantle convection has been investigated via 2-D numerical simulations that incorporate the stability field of majorite. According to a recent first principles study, wadsleyite decomposes into an assemblage of majorite plus periclase with a large negative Clapeyron slope. Since the stability field of majorite is limited to be greater than ~2200 K in a depth range of 500-660 km for Mg2SiO4, very hot upwelling plumes are expected to be strongly influenced by the phase transitions related to majorite. These hot upwellings are occasionally observed in simulations, even though the average temperature of hot plumes is far less than the stability field of majorite. The dynamics of these upwellings are controlled by the release and the absorption of latent heat induced by majorite's phase transitions as well as by the interruption of currents due to the large negative Clapeyron slope related to majorite. Key Points We find strongly heated hot plumes when temperature of mantle is highHot plumes in Archean could be affected by transitions related to majoriteHigh temperature plumes intermittently form at the present mantle temperature

    Original languageEnglish
    Pages (from-to)7501-7507
    Number of pages7
    JournalGeophysical Research Letters
    Volume41
    Issue number21
    DOIs
    Publication statusPublished - Nov 16 2014

    Keywords

    • majorite
    • mantle convection
    • phase transition

    ASJC Scopus subject areas

    • Geophysics
    • Earth and Planetary Sciences(all)

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  • Cite this

    Ichikawa, H., Kameyama, M., Senshu, H., Kawai, K., & Maruyama, S. (2014). Influence of majorite on hot plumes. Geophysical Research Letters, 41(21), 7501-7507. https://doi.org/10.1002/2014GL061477