The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones
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 investigat...
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| Format: | Article |
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MDPI AG
2021-01-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/1/70 |
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| author | Geeth Manthilake Julien Chantel Nicolas Guignot Andrew King |
| author_facet | Geeth Manthilake Julien Chantel Nicolas Guignot Andrew King |
| author_sort | Geeth Manthilake |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T04:59:39Z |
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| id | doaj.art-f7b64427c3894e83beda68c170f1662c |
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| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T04:59:39Z |
| publishDate | 2021-01-01 |
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| series | Minerals |
| spelling | doaj.art-f7b64427c3894e83beda68c170f1662c2023-12-03T13:01:53ZengMDPI AGMinerals2075-163X2021-01-011117010.3390/min11010070The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction ZonesGeeth Manthilake0Julien Chantel1Nicolas Guignot2Andrew King3Laboratoire Magmas et Volcans, Université Clermont Auvergne, CNRS, IRD, OPGC, 63000 Clermont-Ferrand, FranceUniversity Lille, CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, 59000 Lille, FranceSynchrotron SOLEIL, 91192 Gif-Sur-Yvette, FranceSynchrotron SOLEIL, 91192 Gif-Sur-Yvette, FranceDehydration 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.https://www.mdpi.com/2075-163X/11/1/70elastic wave velocitysubduction zonedehydrationchloriteseismic anomalieshigh pressure |
| spellingShingle | Geeth Manthilake Julien Chantel Nicolas Guignot Andrew King The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones Minerals elastic wave velocity subduction zone dehydration chlorite seismic anomalies high pressure |
| title | The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones |
| title_full | The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones |
| title_fullStr | The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones |
| title_full_unstemmed | The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones |
| title_short | The Anomalous Seismic Behavior of Aqueous Fluids Released during Dehydration of Chlorite in Subduction Zones |
| title_sort | anomalous seismic behavior of aqueous fluids released during dehydration of chlorite in subduction zones |
| topic | elastic wave velocity subduction zone dehydration chlorite seismic anomalies high pressure |
| url | https://www.mdpi.com/2075-163X/11/1/70 |
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