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Elasticity of epidote at high pressure and its implications for the velocity anomaly in subduction zone

Junsheng Ma, Nao Cai, Duojun Wang

Geoscience Frontiers ›› 2025, Vol. 16 ›› Issue (1) : 101933.

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Geoscience Frontiers ›› 2025, Vol. 16 ›› Issue (1) : 101933. DOI: 10.1016/j.gsf.2024.101933

Elasticity of epidote at high pressure and its implications for the velocity anomaly in subduction zone

• Junsheng Ma , 
• Nao Cai^* , 
• Duojun Wang

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High Pressure Research Center, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 101400, China

* E-mail address: cainao@ucas.ac.cn

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Published
01 Jan 2025
Issue Date
23 Mar 2025

Abstract

Hydrous minerals play a critical role in modifying the physical and chemical properties of the Earth’s interior. Among those, epidote is an important hydrous mineral in greenschist and blueschist phases of the metamorphosed subducting crust at shallow depth (30-60 km). Here, we measured the compressional (P) and shear (S) wave velocities of a polycrystalline epidote sample at pressures up to 7 GPa and room temperature by means of ultrasonic interferometry. The obtained sound velocities and elastic moduli of epidote increase monotonically with pressure. Finite strain analysis on those data set yielded the elastic moduli and their pressure derivatives of epidote at ambient condition as follows: $K_{S0}=115.2\mathrm{GPa}$, $G_0=66.7\mathrm{GPa}$, $K_s^{\prime }=4.6$$K_s^{\prime }=4.6$, $G^{\prime }=1.1$$G^{\prime }=1.1$. Using the elastic properties of epidote, we set up a model to better understand the velocity jumps in the subducted oceanic crusts concerning the blueschist-eclogite transition at 60-90 km depths. Our results indicate that the calculated P and S wave velocity jumps are in good agreement with those seismic observations in the typical subduction zones such as northeastern Japan and southwestern Japan. The eclogitization from epidote bearing blueschist may provide an explanation for the wave velocity anomalies occurred in those regions.

Keywords

Epidote / Hydrous mineral / Elasticity / Subduction zone

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Junsheng Ma, Nao Cai, Duojun Wang. Elasticity of epidote at high pressure and its implications for the velocity anomaly in subduction zone. Geoscience Frontiers, 2025, 16(1): 101933 https://doi.org/10.1016/j.gsf.2024.101933

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