Enhanced Visibility of Subduction Slabs by the Formation of Dense Hydrous Phase A

被引:10
作者
Cai, Nao [1 ,2 ]
Qi, Xintong [1 ]
Chen, Ting [3 ]
Wang, Siheng [3 ]
Yu, Tony [4 ]
Wang, Yanbin [4 ]
Inoue, Toru [5 ,6 ]
Wang, Duojun [2 ]
Li, Baosheng [1 ,3 ]
机构
[1] SUNY Stony Brook, Mineral Phys Inst, Stony Brook, NY 11794 USA
[2] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
[3] SUNY Stony Brook, Dept Geosci, Stony Brook, NY USA
[4] Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL USA
[5] Hiroshima Univ, Dept Earth & Planetary Syst Sci, HigashiHiroshima, Japan
[6] Hiroshima Univ, Hiroshima Inst Plate Convergence Reg Res HiPeR, HigashiHiroshima, Japan
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
EQUATION-OF-STATE; MAGNESIUM-SILICATE-PHASE; X-RAY-DIFFRACTION; HIGH-PRESSURE; SOUND VELOCITIES; ELASTIC-CONSTANTS; CRYSTAL-STRUCTURE; MANTLE; CLINOHUMITE; WATER;
D O I
10.1029/2021GL095487
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Phase A (Mg7Si2O8(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 similar to 5 wt% hydration, its seismic detectability is enhanced by 1%-1.5% in velocity contrasts relative to its anhydrous counterpart.
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页数:10
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