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Elasticity of single-crystal superhydrous phase B at simultaneous high pressure-temperature conditions

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2016GL070027· OSTI ID:1330859
 [1];  [2];  [1];  [1];  [3];  [2];  [1];  [2];  [4];  [5]
  1. Univ. of Science and Technology of China, Hefei (China)
  2. Univ. of Science and Technology of China, Hefei (China); National Geophysics Observatory, Bozhou (China)
  3. Chinese Academy of Sciences (CAS), Guiyang (China)
  4. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
  5. Univ. of Texas, Austin, TX (United States)
We investigated the combined effect of pressure and temperature on the elasticity of single-crystal superhydrous phase B (Shy-B) using Brillouin scattering and X-ray diffraction up to 12 GPa and 700 K. Next, using the obtained elasticity, we modeled the anisotropy of Shy-B along slab geotherms, showing that Shy-B has a low anisotropy and cannot be the major cause of the observed anisotropy in the region. Modeled velocities of Shy-B show that Shy-B will be shown as positive velocity anomalies at the bottom transition zone. Once Shy-B is transported to the topmost lower mantle, it will exhibit a seismic signature of lower velocities than topmost lower mantle. We speculate that an accumulation of hydrous phases, such as Shy-B, at the topmost lower mantle with a weight percentage of ~17–26% in the peridotite layer as subduction progresses could help explain the observed 2–3% low shear velocity anomalies in the region.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Fundamental Research Funds for the Central Universities in China; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE
Grant/Contract Number:
FG02-94ER14466
OSTI ID:
1330859
Alternate ID(s):
OSTI ID: 1402384
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 16 Vol. 43; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (2)

Elasticity and Anisotropy of the Pyrite-Type FeO2H-FeO2 System in Earth’s Lowermost Mantle journal July 2018
An Extended Semianalytical Approach for Thermoelasticity of Monoclinic Crystals: Application to Diopside journal September 2018

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