Anomalous Sound Velocities of Antigorite at High Pressure and Implications for Detecting Serpentinization at Mantle Wedges

Wang, Duojun; Liu, Tao; Chen, Ting; Qi, Xintong; Li, Baosheng

doi:10.1029/2019gl082287

Anomalous Sound Velocities of Antigorite at High Pressure and Implications for Detecting Serpentinization at Mantle Wedges

Journal Article · Mon Apr 29 00:00:00 EDT 2019 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2019gl082287· OSTI ID:1614451

^[1]; Liu, Tao ^[2]; ^[3]; ^[3]; ^[3]

Univ. of Chinese Academy of Sciences, Beijing (China). College of Earth and Planetary Sciences; State Univ. of New York (SUNY), Stony Brook, NY (United States); DOE/OSTI
Univ. of Chinese Academy of Sciences, Beijing (China). College of Earth and Planetary Sciences
State Univ. of New York (SUNY), Stony Brook, NY (United States)

Elastic properties of antigorite are important for interpretation of seismic mapping of serpentinization in the mantle wedge above subducting slabs. The compressional (V_P) and shear (V_S) wave velocities in pure antigorite aggregates were measured simultaneously up to 8.4 GPa by ultrasonic interferometry. We found that V_P increases monotonically with pressure while V_S increases with pressure up to about 3 GPa but undergoes a negative pressure dependence above 4 GPa. Compared to other mantle minerals, antigorite exhibits significantly lower P and S wave velocities as well as a higher V_P/V_S ratio at upper mantle pressures. We modeled velocity reductions manifesting through the formation of antigorite in mantle peridotite and provide compelling evidence that seismic anomalies with low-velocity and high V_P/V_S ratios is caused by varying degrees of serpentinization in subduction zones.

View Accepted Manuscript (DOE)

Research Organization:: State Univ. of New York (SUNY), Albany, NY (United States); Stony Brook Univ., NY (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Natural Science Foundation of China

Grant/Contract Number:: NA0001815; NA0003886

OSTI ID:: 1614451

Alternate ID(s):: OSTI ID: 1638372

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 10 Vol. 46; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Anomalous Sound Velocities of Antigorite at High Pressure and Implications for Detecting Serpentinization at Mantle Wedges

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