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Volume 30 Issue 6
Dec 2019
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Journal of Earth Science  > 2019  >  30(6): 1293-1301.
Shengxuan Huang, Shan Qin, Xiang Wu. Elasticity and Anisotropy of the Pyrite-Type FeO2H-FeO2 System in Earth's Lowermost Mantle. Journal of Earth Science, 2019, 30(6): 1293-1301. doi: 10.1007/s12583-018-0836-y
Citation: Shengxuan Huang, Shan Qin, Xiang Wu. Elasticity and Anisotropy of the Pyrite-Type FeO2H-FeO2 System in Earth's Lowermost Mantle. Journal of Earth Science, 2019, 30(6): 1293-1301. doi: 10.1007/s12583-018-0836-y
shu

Elasticity and Anisotropy of the Pyrite-Type FeO2H-FeO2 System in Earth's Lowermost Mantle

doi: 10.1007/s12583-018-0836-y
  • 1.

    Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China

  • 2.

    State Key Laboratory of Geological Processes and Mineral Resourses, China University of Geosciences, Wuhan 430074, China

Funds:  Xiang Wu and Shan Qin acknowledge financial support from the National Natural Science Foundation of China (Nos. 41473056 and 41472037)
More Information
  • Corresponding author: Xiang Wu
  • Received Date: 10 Dec 2017
  • Accepted Date: 20 Apr 2018
  • Publish Date: 01 Dec 2019
    Abstract
  • The pyrite-type FeO2H-FeO2 system has been experimentally confirmed to be stable in Earth's lowermost mantle but there is limited information about its physical properties at high pressures constraining our understanding of its potential geophysical implications for the deep Earth. Here,static calculations demonstrate that the pyrite-type FeO2H-FeO2 system has a high density and Poisson's ratio and ultra-low seismic velocities at conditions of Earth's lowermost mantle. It provides a plausible mechanism for the origin of ultra-low velocity zones at Earth's D″ layer. The incorporation of hydrogen in the pyrite-type FeO2H-FeO2 system tends to decrease the S wave velocity (VS) but increase the bulk sound velocity (VΦ),and can potentially explain the observed anti-correlation of VS and VΦ in the lowermost mantle. Additionally,FeO2H exhibits nearly isotropic whereas FeO2 is highly anisotropic,which may help understand some seismic anisotropies at the core-mantle boundary.

     

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