Iron-rich post-perovskite and the origin of ultralow-velocity zones

Science
Wendy L MaoR J Hemley

Abstract

The boundary layer between the crystalline silicate lower mantle and the liquid iron core contains regions with ultralow seismic velocities. Such low compressional and shear wave velocities and high Poisson's ratio are also observed experimentally in post-perovskite silicate phase containing up to 40 mol% FeSiO3 endmember. The iron-rich post-perovskite silicate is stable at the pressure-temperature and chemical environment of the core-mantle boundary and can be formed by core-mantle reaction. Mantle dynamics may lead to further accumulation of this material into the ultralow-velocity patches that are observable by seismology.

References

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Citations

Mar 13, 2009·Proceedings of the National Academy of Sciences of the United States of America·Sang-Heon ShimVitali Prakapenka
Mar 23, 2010·Proceedings of the National Academy of Sciences of the United States of America·Lin WangHo-kwang Mao
Jan 10, 2012·Proceedings of the National Academy of Sciences of the United States of America·Takamitsu YamanakaRussell J Hemley
Apr 12, 2013·Proceedings of the National Academy of Sciences of the United States of America·Li ZhangHo-Kwang Mao
Sep 27, 2008·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·James Wookey, David P Dobson
Jun 26, 2007·Science·Sébastien MerkelHans-Rudolf Wenk
May 3, 2008·Science·Edward J Garnero, Allen K McNamara
May 5, 2016·Proceedings of the National Academy of Sciences of the United States of America·Jiachao LiuJesse S Smith
Apr 8, 2017·Science·Andrea MundlRichard J Walker
Dec 17, 2009·Nature·Kanani K M Lee
Aug 5, 2017·Nature Communications·Mingming LiShule Yu
Apr 30, 2017·Journal of Synchrotron Radiation·Xiaodong LiWeiran Cui
Jul 29, 2017·Science·Kaiqing Yuan, Barbara Romanowicz
Apr 4, 2018·Proceedings of the National Academy of Sciences of the United States of America·Wen-Pin HsiehJung-Fu Lin
Nov 23, 2016·Reports on Progress in Physics·Guoyin Shen, Ho Kwang Mao
Jan 5, 2019·Physical Review Letters·Jurong ZhangYanming Ma

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