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

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1002/2016JB013209· OSTI ID:1331674
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. China Univ. of Geosciences, Wuhan (China); Peking Univ. (China)
  2. Peking Univ. (China)
  3. Univ. of Texas, Austin, TX (United States); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  4. Univ. of Texas, Austin, TX (United States)
  5. Univ. of Science and Technology of China, Hefei (China)
  6. China Univ. of Geosciences, Wuhan (China); Okayama Univ., Tottori (Japan)
  7. Okayama Univ., Tottori (Japan)
  8. Univ. Bayreuth (Germany)
  9. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
  10. Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab., HPCAT

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. We report 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; NA0001974; FG02-99ER45775; U1232204; 41473056
OSTI ID:
1331674
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 121, Issue 9; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Elasticity and Anisotropy of the Pyrite-Type FeO2H-FeO2 System in Earth’s Lowermost Mantle journal July 2018

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