globalchange  > 科学计划与规划
DOI: 10.1002/2016GL070027
论文题名:
Elasticity of single-crystal superhydrous phase B at simultaneous high pressure-temperature conditions
作者: Li X.; Mao Z.; Sun N.; Liao Y.; Zhai S.; Wang Y.; Ni H.; Wang J.; Tkachev S.N.; Lin J.-F.
刊名: Geophysical Research Letters
ISSN: 0094-8725
EISSN: 1944-8456
出版年: 2016
卷: 43, 期:16
起始页码: 8458
结束页码: 8465
语种: 英语
英文关键词: high P-T ; low-velocity layer ; mantle ; single crystal elasticity ; superhydrous phase B ; water
Scopus关键词: 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
英文摘要: 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.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84987761333&doi=10.1002%2f2016GL070027&partnerID=40&md5=e4990601cea6c88b6950b7c3071e08e8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9688
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: 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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