Elasticity of superhydrous phase B at the mantle temperatures and pressures: Implications for 800 km discontinuity and water flow into the lower mantle

Dapeng Yang; Wenzhong Wang; Zhongqing Wu

doi:10.1002/2017jb014319

journal article Jul 01, 2017

Elasticity of superhydrous phase B at the mantle temperatures and pressures: Implications for 800 km discontinuity and water flow into the lower mantle

Dapeng Yang Wenzhong Wang

Zhongqing Wu

Journal of Geophysical Research: Solid Earth Vol. 122 No. 7 pp. 5026-5037 · American Geophysical Union (AGU)

View at Publisher Save 10.1002/2017jb014319

Abstract

AbstractThe thermodynamic properties and elasticity of superhydrous phase B (ShyB) at high pressure and temperature are calculated using first‐principles calculations based on density functional theory. The velocities and densities of ShyB are significantly lower than those of bridgmanite and periclase, the major minerals in the lower mantle. The anisotropy of ShyB is unremarkable at relevant mantle conditions. The decomposition of ShyB into bridgmanite, periclase, and water, which can occur at a depth around 800 km at a cold slab, will cause an increase of 7.5%, 15.0%, and 12% on shear velocity, compressional velocity, and density, respectively. Thus, the decomposition of a small amount of ShyB can produce a local discontinuity at the depth of ~800 km. The water released from the decomposition of ShyB may rise upward and promote the partial melt, which can further explain the low‐velocity zones just above 800 km discontinuity in Western‐Pacific Subduction Zones.

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Metrics

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Citations

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References

Details

Published: Jul 01, 2017
Vol/Issue: 122(7)
Pages: 5026-5037
License: View

Authors

D

Dapeng Yang

Laboratory of Seismology and Physics of Earth's Interior and School of Earth and Space Sciences University of Science and Technology of China Hefei China; National Geophysical Observatory at Mengcheng University of Science and Technology of China Hefei China

W

Wenzhong Wang

Laboratory of Seismology and Physics of Earth's Interior and School of Earth and Space Sciences University of Science and Technology of China Hefei China; National Geophysical Observatory at Mengcheng University of Science and Technology of China Hefei China

Z

Zhongqing Wu

Laboratory of Seismology and Physics of Earth's Interior and School of Earth and Space Sciences University of Science and Technology of China Hefei China; National Geophysical Observatory at Mengcheng University of Science and Technology of China Hefei China

Funding

National Natural Science Foundation of China Award: 41590621

Cite This Article

Dapeng Yang, Wenzhong Wang, Zhongqing Wu (2017). Elasticity of superhydrous phase B at the mantle temperatures and pressures: Implications for 800 km discontinuity and water flow into the lower mantle. Journal of Geophysical Research: Solid Earth, 122(7), 5026-5037. https://doi.org/10.1002/2017jb014319

Elasticity of superhydrous phase B at the mantle temperatures and pressures: Implications for 800 km discontinuity and water flow into the lower mantle

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