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


13 被引用数 (Scopus)


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.

ジャーナルJournal of Geophysical Research: Solid Earth
出版ステータスPublished - 9月 1 2016

ASJC Scopus subject areas

  • 地球物理学
  • 地球化学および岩石学
  • 地球惑星科学(その他)
  • 宇宙惑星科学


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