Determination of post-perovskite phase transition boundary up to 4400 K and implications for thermal structure in D″ layer

Shigehiko Tateno, Kei Hirose, Nagayoshi Sata, Yasuo Ohishi

    Research output: Contribution to journalArticlepeer-review

    109 Citations (Scopus)

    Abstract

    We have determined the post-perovskite phase transition boundary in MgSiO3 in a wide temperature range from 1640 to 4380 K at 119-171 GPa on the basis of synchrotron X-ray diffraction measurements in-situ at high-pressure and -temperature in a laser-heated diamond-anvil cell (LHDAC). The results show a considerably high positive Clapeyron slope of + 13.3 ± 1.0 MPa/K and a transition temperature of about 3520 ± 70 K at the core-mantle boundary (CMB) pressure. The thermal structure in D″ layer can be tightly constrained from precisely determined post-perovskite phase transition boundary and the depths of paired seismic discontinuities. These suggest that temperature at the CMB may be around 3700 K, somewhat lower than previously thought. A minimum bound on the global heat flow from the core is estimated to be 6.6 ± 0.5 TW.

    Original languageEnglish
    Pages (from-to)130-136
    Number of pages7
    JournalEarth and Planetary Science Letters
    Volume277
    Issue number1-2
    DOIs
    Publication statusPublished - Jan 15 2009

    Keywords

    • core-mantle boundary
    • in-situ X-ray diffraction
    • lower mantle
    • phase transition
    • post-perovskite

    ASJC Scopus subject areas

    • Geophysics
    • Geochemistry and Petrology
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science

    Fingerprint

    Dive into the research topics of 'Determination of post-perovskite phase transition boundary up to 4400 K and implications for thermal structure in D″ layer'. Together they form a unique fingerprint.

    Cite this