Elastic Wave Velocities of Lawsonite and Its Implications for Seismic Velocity Anomalies in Subduction Zones

MA Junsheng; LIU Chuanjiang; WANG Duojun; CAI Nao; ZHANG Rui

doi:10.11858/gywlxb.20261006

Volume 40 Issue 10

Oct 2026

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Chinese Journal of High Pressure Physics > 2026 > 40(10): 101201.

MA Junsheng, LIU Chuanjiang, WANG Duojun, CAI Nao, ZHANG Rui. Elastic Wave Velocities of Lawsonite and Its Implications for Seismic Velocity Anomalies in Subduction Zones[J]. Chinese Journal of High Pressure Physics, 2026, 40(10): 101201. doi: 10.11858/gywlxb.20261006

Citation:

MA Junsheng, LIU Chuanjiang, WANG Duojun, CAI Nao, ZHANG Rui. Elastic Wave Velocities of Lawsonite and Its Implications for Seismic Velocity Anomalies in Subduction Zones[J]. Chinese Journal of High Pressure Physics, 2026, 40(10): 101201. doi: 10.11858/gywlxb.20261006

Citation:

MA Junsheng, LIU Chuanjiang, WANG Duojun, CAI Nao, ZHANG Rui. Elastic Wave Velocities of Lawsonite and Its Implications for Seismic Velocity Anomalies in Subduction Zones[J]. Chinese Journal of High Pressure Physics, 2026, 40(10): 101201. doi: 10.11858/gywlxb.20261006

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Elastic Wave Velocities of Lawsonite and Its Implications for Seismic Velocity Anomalies in Subduction Zones

doi: 10.11858/gywlxb.20261006

MA Junsheng^{1, 2
,},
LIU Chuanjiang^{1, 2},
WANG Duojun^{1, 2
,},
CAI Nao^{1, 2,*
,
,},
ZHANG Rui^{1, 2}

1.
High Pressure Science Experiment Center, University of Chinese Academy of Sciences, Beijing 100049, China
2.
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 08 Jan 2026
Rev Recd Date: 08 Feb 2026
Accepted Date: 16 Sep 2026

Available Online: 09 Mar 2026

Issue Publish Date: 22 Oct 2026

Abstract

Abstract

Lawsonite is a key hydrous mineral in subducting oceanic crust, with an H₂O mass fraction of up to 11.5% and volume fractions that can reach 50%, and is stable over a wide pressure-temperature range. Constraining the high-pressure elastic properties of lawsonite is therefore essential for understanding seismic velocity structures in subduction zones and the deep-water cycle. In this study, dense polycrystalline lawsonite was synthesized by hot-pressing natural lawsonite powder at 7 GPa and 1 073 K for 2 h. Ultrasonic interferometry was then used to measure P- and S-wave velocities of lawsonite up to 8 GPa at room temperature, from which the elastic moduli and their pressure derivatives were determined. The results show that both elastic wave velocities and moduli increase with pressure, the adiabatic bulk modulus and shear modulus are 120(1) and 51(1) GPa at room temperature and ambient pressure, and their derivatives with respect to pressure are 5.7(1) and 0.9(1), respectively. Using these elastic properties, together with previous mineral-physics results, we constructed a lawsonite-bearing eclogite model, which indicates that the presence of lawsonite can provide a plausible explanation for the seismic velocity anomalies observed at depths of about 60–90 km within intermediate-temperature subducting slabs such as Nicaragua.
- lawsonite,
- elasticity,
- subduction zone,
- high pressure

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References(37)

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Elastic Wave Velocities of Lawsonite and Its Implications for Seismic Velocity Anomalies in Subduction Zones

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