globalchange  > 科学计划与规划
DOI: 10.1002/2016GL070027
Elasticity of single-crystal superhydrous phase B at simultaneous high pressure-temperature conditions
Author: Li X.; Mao Z.; Sun N.; Liao Y.; Zhai S.; Wang Y.; Ni H.; Wang J.; Tkachev S.N.; Lin J.-F.
Source Publication: Geophysical Research Letters
ISSN: 0094-8725
EISSN: 1944-8456
Publishing Year: 2016
Volume: 43, Issue:16
pages begin: 8458
pages end: 8465
Language: 英语
Keyword: high P-T ; low-velocity layer ; mantle ; single crystal elasticity ; superhydrous phase B ; water
Scopus Keyword: Anisotropy ; Brillouin scattering ; Elasticity ; Shear flow ; Velocity ; Water ; X ray diffraction ; high P-T ; Low velocity layers ; mantle ; Seismic signatures ; Shear velocities ; Superhydrous phase ; Transition zones ; Weight percentages ; Single crystals
English Abstract: 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. 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. ©2016. American Geophysical Union. All Rights Reserved.
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Document Type: 期刊论文
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Affiliation: Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China

Recommended Citation:
Li X.,Mao Z.,Sun N.,et al. Elasticity of single-crystal superhydrous phase B at simultaneous high pressure-temperature conditions[J]. Geophysical Research Letters,2016-01-01,43(16).
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