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Determination of post-perovskite phase transition boundary up to 4400 K and implications for thermal structure in D″ layer
Authors:Shigehiko Tateno  Kei Hirose  Nagayoshi Sata  Yasuo Ohishi
Institution:1. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan;2. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan;3. Japan Synchrotron Radiation Research Institute, Sayo-cho, Hyogo 679-5198, Japan;1. Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, UK;2. School of Engineering and Materials Science, Faculty of Science and Engineering, Queen Mary University of London, Mile End Road, London, E1 4NS, UK;3. Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Los Angeles, CA 90095-1567, USA;4. Centre for Earth Evolution and Dynamics (CEED), University of Oslo, 0316 Oslo, Norway;1. Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany;2. Department of Chemistry, Gakushuin University, 171-8588 Tokyo, Japan;3. Center for High Pressure Science & Technology Advanced Research, Beijing, 100094, China;1. Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX78712, USA;2. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201900, China;3. Center for Advanced Radiation Sources, University of Chicago, IL, USA;4. Institute for Planetary Materials, Okayama University, Japan;1. Institute of Geophysics, Department of Earth Sciences, ETH Zürich, Zürich, Switzerland;2. Department of Earth Sciences, University College London, London, UK;3. Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, Japan
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.
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