Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature
Abstract Sound velocities and densities of Al‐bearing superhydrous phase B (Al‐bearing SuB) were investigated up to 24 GPa and 1300 K by synchrotron X‐rays combined with ultrasonic interferometry techniques in a multi‐anvil apparatus. We found that Al + H incorporation decreases the adiabatic bulk m...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2024-06-01
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| Series: | Geophysical Research Letters |
| Online Access: | https://doi.org/10.1029/2023GL107818 |
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| author | Chaowen Xu Steeve Gréaux Ying Li Fengxia Sun Jing Gao Fei Qin Toru Inoue |
| author_facet | Chaowen Xu Steeve Gréaux Ying Li Fengxia Sun Jing Gao Fei Qin Toru Inoue |
| author_sort | Chaowen Xu |
| collection | DOAJ |
| description | Abstract Sound velocities and densities of Al‐bearing superhydrous phase B (Al‐bearing SuB) were investigated up to 24 GPa and 1300 K by synchrotron X‐rays combined with ultrasonic interferometry techniques in a multi‐anvil apparatus. We found that Al + H incorporation decreases the adiabatic bulk modulus and shear modulus of SuB. Our results however suggest that this effect is less important than that of temperature. The presence of hydrous pyrolite with ∼10 wt.% Al‐bearing SuB in cold subducting slabs could explain up to ∼2% high velocity anomalies at the bottom of the mantle transition zone (500–660 km) while it turns into ∼7.7% low velocity anomalies below 660 km. Al‐bearing SuB is reportedly stable at mantle temperatures, where it could account for ∼12.2% low velocity anomalies beneath subduction zones in the uppermost lower mantle. |
| format | Article |
| id | doaj-art-d94c45a8c7ea46d3b823cd4cfbee532d |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-d94c45a8c7ea46d3b823cd4cfbee532d2025-08-20T01:52:06ZengWileyGeophysical Research Letters0094-82761944-80072024-06-015112n/an/a10.1029/2023GL107818Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High TemperatureChaowen Xu0Steeve Gréaux1Ying Li2Fengxia Sun3Jing Gao4Fei Qin5Toru Inoue6Geodynamics Research Center Ehime University Matsuyama JapanGeodynamics Research Center Ehime University Matsuyama JapanInstitute of Earthquake Forecasting China Earthquake Administration (CEA) Beijing ChinaInstitute of Earthquake Forecasting China Earthquake Administration (CEA) Beijing ChinaLaboratory of Extraterrestrial Ocean Systems Institute of Deep‐sea Science and Engineering Chinese Academy of Sciences Sanya ChinaSchool of Earth Sciences and Resources China University of Geosciences (Beijing) Beijing ChinaDepartment of Earth and Planetary Systems Science Hiroshima University Higashi‐Hiroshima JapanAbstract Sound velocities and densities of Al‐bearing superhydrous phase B (Al‐bearing SuB) were investigated up to 24 GPa and 1300 K by synchrotron X‐rays combined with ultrasonic interferometry techniques in a multi‐anvil apparatus. We found that Al + H incorporation decreases the adiabatic bulk modulus and shear modulus of SuB. Our results however suggest that this effect is less important than that of temperature. The presence of hydrous pyrolite with ∼10 wt.% Al‐bearing SuB in cold subducting slabs could explain up to ∼2% high velocity anomalies at the bottom of the mantle transition zone (500–660 km) while it turns into ∼7.7% low velocity anomalies below 660 km. Al‐bearing SuB is reportedly stable at mantle temperatures, where it could account for ∼12.2% low velocity anomalies beneath subduction zones in the uppermost lower mantle.https://doi.org/10.1029/2023GL107818 |
| spellingShingle | Chaowen Xu Steeve Gréaux Ying Li Fengxia Sun Jing Gao Fei Qin Toru Inoue Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature Geophysical Research Letters |
| title | Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature |
| title_full | Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature |
| title_fullStr | Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature |
| title_full_unstemmed | Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature |
| title_short | Effect of Al‐Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature |
| title_sort | effect of al incorporation on the sound velocities of superhydrous phase b at high pressure and high temperature |
| url | https://doi.org/10.1029/2023GL107818 |
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