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Article

The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones

1
Laboratoire Magmas et Volcans, Université Clermont Auvergne, CNRS, IRD, OPGC, 63000 Clermont-Ferrand, France
2
University Lille, CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, 59000 Lille, France
3
Synchrotron SOLEIL, 91192 Gif-Sur-Yvette, France
*
Author to whom correspondence should be addressed.
Minerals 2021, 11(1), 70; https://doi.org/10.3390/min11010070
Received: 8 November 2020 / Revised: 21 December 2020 / Accepted: 8 January 2021 / Published: 13 January 2021
Dehydration and fluid circulation are integral parts of subduction tectonics that govern the dynamics of the wedge mantle. The knowledge of the elastic behavior of aqueous fluid is crucial to understand the fluid–rock interactions in the mantle through velocity profiles. In this study, we investigated the elastic wave velocities of chlorite at high pressure beyond its dehydrating temperature, simulating the progressive dehydration of hydrous minerals in subduction zones. The dehydration resulted in an 8% increase in compressional (Vp) and a 5% decrease in shear wave (Vs) velocities at 950 K. The increase in Vp can be attributed to the stiffening of the sample due to the formation of secondary mineral phases followed by the dehydration of chlorite. The fluid-bearing samples exhibited Vp/Vs of 2.45 at 950 K. These seismic parameters are notably different from the major mantle minerals or hydrous silicate melts and provide unique seismic criteria for detecting mantle fluids through seismic tomography. View Full-Text
Keywords: elastic wave velocity; subduction zone; dehydration; chlorite; seismic anomalies; high pressure elastic wave velocity; subduction zone; dehydration; chlorite; seismic anomalies; high pressure
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MDPI and ACS Style

Manthilake, G.; Chantel, J.; Guignot, N.; King, A. The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones. Minerals 2021, 11, 70. https://doi.org/10.3390/min11010070

AMA Style

Manthilake G, Chantel J, Guignot N, King A. The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones. Minerals. 2021; 11(1):70. https://doi.org/10.3390/min11010070

Chicago/Turabian Style

Manthilake, Geeth, Julien Chantel, Nicolas Guignot, and Andrew King. 2021. "The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones" Minerals 11, no. 1: 70. https://doi.org/10.3390/min11010070

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