Anomalous Sound Velocities of Antigorite at High Pressure and Implications for Detecting Serpentinization at Mantle Wedges
Abstract
Elastic properties of antigorite are important for interpretation of seismic mapping of serpentinization in the mantle wedge above subducting slabs. The compressional (VP) and shear (VS) wave velocities in pure antigorite aggregates were measured simultaneously up to 8.4 GPa by ultrasonic interferometry. We found that VP increases monotonically with pressure while VS 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 VP/VS 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 VP/VS ratios is caused by varying degrees of serpentinization in subduction zones.
- Authors:
-
[1];
[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)
- 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)
- Publication Date:
- Research Org.:
- State Univ. of New York (SUNY), Albany, NY (United States); Stony Brook Univ., NY (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Natural Science Foundation of China
- OSTI Identifier:
- 1614451
- Alternate Identifier(s):
- OSTI ID: 1638372
- Grant/Contract Number:
- NA0001815; EAR1045630; 41874104; NA0003886
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 46; Journal Issue: 10; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Geology; sound velocities; pure antigorite aggregates; high pressure; serpentinization; low-velocity anomalies; mantle wedge; Antigorite, Equation of state, Elasticity, Ultrasonic velocity
Citation Formats
Wang, Duojun, Liu, Tao, Chen, Ting, Qi, Xintong, and Li, Baosheng. Anomalous Sound Velocities of Antigorite at High Pressure and Implications for Detecting Serpentinization at Mantle Wedges. United States: N. p., 2019.
Web. doi:10.1029/2019gl082287.
Wang, Duojun, Liu, Tao, Chen, Ting, Qi, Xintong, & Li, Baosheng. Anomalous Sound Velocities of Antigorite at High Pressure and Implications for Detecting Serpentinization at Mantle Wedges. United States. https://doi.org/10.1029/2019gl082287
Wang, Duojun, Liu, Tao, Chen, Ting, Qi, Xintong, and Li, Baosheng. Mon .
"Anomalous Sound Velocities of Antigorite at High Pressure and Implications for Detecting Serpentinization at Mantle Wedges". United States. https://doi.org/10.1029/2019gl082287. https://www.osti.gov/servlets/purl/1614451.
@article{osti_1614451,
title = {Anomalous Sound Velocities of Antigorite at High Pressure and Implications for Detecting Serpentinization at Mantle Wedges},
author = {Wang, Duojun and Liu, Tao and Chen, Ting and Qi, Xintong and Li, Baosheng},
abstractNote = {Elastic properties of antigorite are important for interpretation of seismic mapping of serpentinization in the mantle wedge above subducting slabs. The compressional (VP) and shear (VS) wave velocities in pure antigorite aggregates were measured simultaneously up to 8.4 GPa by ultrasonic interferometry. We found that VP increases monotonically with pressure while VS 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 VP/VS 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 VP/VS ratios is caused by varying degrees of serpentinization in subduction zones.},
doi = {10.1029/2019gl082287},
journal = {Geophysical Research Letters},
number = 10,
volume = 46,
place = {United States},
year = {Mon Apr 29 00:00:00 EDT 2019},
month = {Mon Apr 29 00:00:00 EDT 2019}
}
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