Enhanced Visibility of Subduction Slabs by the Formation of Dense Hydrous Phase A
Abstract
Abstract Phase A (Mg 7 Si 2 O 8 (OH) 6 ) is one of the important dense hydrous magnesium silicates in subducting slab, because it forms after the breakdown of antigorite serpentine and could be the dominant hydrous phase in the upper‐mantle deep slab for the water transportation into deep Earth. In this study, the compressional ( P ) and shear ( S ) wave velocities of phase A were measured at simultaneous pressure and temperature conditions up to 11 GPa and 1073 K. Combined with elastic properties of olivine and pyroxenes, we calculate the hydration effect on the velocities of harzburgite lithology in cold subduction zones throughout the depth ranges where phase A is thermodynamically stable. Our calculations suggest that the hydration increases both P ‐ and S ‐wave velocities of harzburgite; at ∼5 wt% hydration, its seismic detectability is enhanced by 1%–1.5% in velocity contrasts relative to its anhydrous counterpart.
- Authors:
-
[1];
[2];
[3];
[3];
[4];
[6];
- Mineral Physics Institute Stony Brook University Stony Brook NY USA, College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing China
- Mineral Physics Institute Stony Brook University Stony Brook NY USA
- Department of Geosciences Stony Brook University Stony Brook NY USA
- Center for Advanced Radiation Sources The University of Chicago Chicago IL USA
- Department of Earth and Planetary Systems Science Hiroshima University Higashi‐Hiroshima Japan, Hiroshima Institute of Plate Convergence Region Research (HiPeR) Hiroshima University Higashi‐Hiroshima Japan
- College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing China
- Mineral Physics Institute Stony Brook University Stony Brook NY USA, Department of Geosciences Stony Brook University Stony Brook NY USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1823506
- Grant/Contract Number:
- DE‐FG02‐94ER14466
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Name: Geophysical Research Letters Journal Volume: 48 Journal Issue: 19; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Cai, Nao, Qi, Xintong, Chen, Ting, Wang, Siheng, Yu, Tony, Wang, Yanbin, Inoue, Toru, Wang, Duojun, and Li, Baosheng. Enhanced Visibility of Subduction Slabs by the Formation of Dense Hydrous Phase A. United States: N. p., 2021.
Web. doi:10.1029/2021GL095487.
Cai, Nao, Qi, Xintong, Chen, Ting, Wang, Siheng, Yu, Tony, Wang, Yanbin, Inoue, Toru, Wang, Duojun, & Li, Baosheng. Enhanced Visibility of Subduction Slabs by the Formation of Dense Hydrous Phase A. United States. https://doi.org/10.1029/2021GL095487
Cai, Nao, Qi, Xintong, Chen, Ting, Wang, Siheng, Yu, Tony, Wang, Yanbin, Inoue, Toru, Wang, Duojun, and Li, Baosheng. Sat .
"Enhanced Visibility of Subduction Slabs by the Formation of Dense Hydrous Phase A". United States. https://doi.org/10.1029/2021GL095487.
@article{osti_1823506,
title = {Enhanced Visibility of Subduction Slabs by the Formation of Dense Hydrous Phase A},
author = {Cai, Nao and Qi, Xintong and Chen, Ting and Wang, Siheng and Yu, Tony and Wang, Yanbin and Inoue, Toru and Wang, Duojun and Li, Baosheng},
abstractNote = {Abstract Phase A (Mg 7 Si 2 O 8 (OH) 6 ) is one of the important dense hydrous magnesium silicates in subducting slab, because it forms after the breakdown of antigorite serpentine and could be the dominant hydrous phase in the upper‐mantle deep slab for the water transportation into deep Earth. In this study, the compressional ( P ) and shear ( S ) wave velocities of phase A were measured at simultaneous pressure and temperature conditions up to 11 GPa and 1073 K. Combined with elastic properties of olivine and pyroxenes, we calculate the hydration effect on the velocities of harzburgite lithology in cold subduction zones throughout the depth ranges where phase A is thermodynamically stable. Our calculations suggest that the hydration increases both P ‐ and S ‐wave velocities of harzburgite; at ∼5 wt% hydration, its seismic detectability is enhanced by 1%–1.5% in velocity contrasts relative to its anhydrous counterpart.},
doi = {10.1029/2021GL095487},
journal = {Geophysical Research Letters},
number = 19,
volume = 48,
place = {United States},
year = {Sat Oct 16 00:00:00 EDT 2021},
month = {Sat Oct 16 00:00:00 EDT 2021}
}
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