Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle

Xiang Wu, Ye Wu, Jung Fu Lin, Jin Liu, Zhu Mao, Xinzhuan Guo, Takashi Yoshino, Catherine McCammon, Vitali B. Prakapenka, Yuming Xiao

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Hydrous magnesium silicate phase D plays a key role in the transport of water from the upper to the lower mantle via subducted slabs. Here we report pressure dependence hyperfine and lattice parameters of FeAl-bearing phase D up to megabar pressures using synchrotron nuclear forward scattering and X-ray diffraction in a diamond anvil cell at room temperature. FeAl-bearing phase D undergoes a two-stage high-spin to low-spin transition of iron for Fe2+ at 37–41 GPa and for Fe3+ at 64–68 GPa. These transitions are accompanied by an increase in density and a significant softening in the bulk modulus and bulk velocity at their respective pressure range. The occurrence of the dense low-spin FeAl-bearing phase D with relatively high velocity anisotropies in deep-subducted slabs can potentially contribute to small-scale seismic heterogeneities in the middle-lower mantle beneath the circum-Pacific area.

Original languageEnglish
Pages (from-to)6411-6420
Number of pages10
JournalJournal of Geophysical Research: Solid Earth
Volume121
Issue number9
DOIs
Publication statusPublished - Sep 1 2016

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Bearings (structural)
lower mantle
Earth mantle
Iron
slabs
iron
slab
Forward scattering
nuclear scattering
diamond anvil cell
Diamond
bulk modulus
forward scattering
anvils
softening
Synchrotrons
X-ray diffraction
pressure dependence
Lattice constants
magnesium

Keywords

  • lower mantle
  • phase D
  • spin transition of iron

ASJC Scopus subject areas

  • Geophysics
  • Oceanography
  • Forestry
  • Ecology
  • Aquatic Science
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle. / Wu, Xiang; Wu, Ye; Lin, Jung Fu; Liu, Jin; Mao, Zhu; Guo, Xinzhuan; Yoshino, Takashi; McCammon, Catherine; Prakapenka, Vitali B.; Xiao, Yuming.

In: Journal of Geophysical Research: Solid Earth, Vol. 121, No. 9, 01.09.2016, p. 6411-6420.

Research output: Contribution to journalArticle

Wu, X, Wu, Y, Lin, JF, Liu, J, Mao, Z, Guo, X, Yoshino, T, McCammon, C, Prakapenka, VB & Xiao, Y 2016, 'Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle', Journal of Geophysical Research: Solid Earth, vol. 121, no. 9, pp. 6411-6420. https://doi.org/10.1002/2016JB013209
Wu, Xiang ; Wu, Ye ; Lin, Jung Fu ; Liu, Jin ; Mao, Zhu ; Guo, Xinzhuan ; Yoshino, Takashi ; McCammon, Catherine ; Prakapenka, Vitali B. ; Xiao, Yuming. / Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle. In: Journal of Geophysical Research: Solid Earth. 2016 ; Vol. 121, No. 9. pp. 6411-6420.
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