Sound Velocities of the Hydrous Iron‐Rich HH1‐Phase: Implications for Lower Mantle Seismic Heterogeneities
Abstract We investigated the compressional and shear velocities, VP and VS, of the HH1‐phase by combining the inelastic x‐ray scattering and x‐ray diffraction experiments. In the pressure range of 64.7–79.6 GPa and at room temperature, the VP and VS were measured to be 9.66–11.05 and 4.9–6.4 km·s⁻1,...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL112963 |
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| author | Lu Liu Alfred Q. R. Baron Eiji Ohtani Hiroshi Fukui Daijo Ikuta Daisuke Ishikawa Li Zhang |
| author_facet | Lu Liu Alfred Q. R. Baron Eiji Ohtani Hiroshi Fukui Daijo Ikuta Daisuke Ishikawa Li Zhang |
| author_sort | Lu Liu |
| collection | DOAJ |
| description | Abstract We investigated the compressional and shear velocities, VP and VS, of the HH1‐phase by combining the inelastic x‐ray scattering and x‐ray diffraction experiments. In the pressure range of 64.7–79.6 GPa and at room temperature, the VP and VS were measured to be 9.66–11.05 and 4.9–6.4 km·s⁻1, respectively. We employed a simplified model to quantitatively discuss the sound velocity differences between hydrous and anhydrous phase assemblages in the mid‐lower mantle, revealing that the hydrous assemblage exhibits increased VS and a reduced VP/VS ratio compared to its anhydrous counterpart. This suggests formation of seismic scatterers in the mid‐lower mantle exhibiting high VS anomalies may be related to the heterogeneous distribution of water. Moreover, the interpretation of a large VP/VS ratio as indicating the presence of water in the upper mantle and crust may not be applicable for detecting water in the lower mantle. |
| format | Article |
| id | doaj-art-cf6b6c0269174a589d9b17c3a628ff81 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-cf6b6c0269174a589d9b17c3a628ff812025-01-20T13:05:57ZengWileyGeophysical Research Letters0094-82761944-80072025-01-01521n/an/a10.1029/2024GL112963Sound Velocities of the Hydrous Iron‐Rich HH1‐Phase: Implications for Lower Mantle Seismic HeterogeneitiesLu Liu0Alfred Q. R. Baron1Eiji Ohtani2Hiroshi Fukui3Daijo Ikuta4Daisuke Ishikawa5Li Zhang6Center for High Pressure Science and Technology Advanced Research Shanghai ChinaMaterials Dynamics Laboratory RIKEN SPring‐8 Center Sayo JapanDepartment of Earth Science Graduate School of Science Tohoku University Sendai JapanMaterials Dynamics Laboratory RIKEN SPring‐8 Center Sayo JapanInstitute for Planetary Materials Okayama University Misasa JapanMaterials Dynamics Laboratory RIKEN SPring‐8 Center Sayo JapanCenter for High Pressure Science and Technology Advanced Research Shanghai ChinaAbstract We investigated the compressional and shear velocities, VP and VS, of the HH1‐phase by combining the inelastic x‐ray scattering and x‐ray diffraction experiments. In the pressure range of 64.7–79.6 GPa and at room temperature, the VP and VS were measured to be 9.66–11.05 and 4.9–6.4 km·s⁻1, respectively. We employed a simplified model to quantitatively discuss the sound velocity differences between hydrous and anhydrous phase assemblages in the mid‐lower mantle, revealing that the hydrous assemblage exhibits increased VS and a reduced VP/VS ratio compared to its anhydrous counterpart. This suggests formation of seismic scatterers in the mid‐lower mantle exhibiting high VS anomalies may be related to the heterogeneous distribution of water. Moreover, the interpretation of a large VP/VS ratio as indicating the presence of water in the upper mantle and crust may not be applicable for detecting water in the lower mantle.https://doi.org/10.1029/2024GL112963hydrous iron‐rich HH1‐phasesound velocityinelastic x‐ray scatteringdiamond anvil cellseismic scattererlower mantle |
| spellingShingle | Lu Liu Alfred Q. R. Baron Eiji Ohtani Hiroshi Fukui Daijo Ikuta Daisuke Ishikawa Li Zhang Sound Velocities of the Hydrous Iron‐Rich HH1‐Phase: Implications for Lower Mantle Seismic Heterogeneities Geophysical Research Letters hydrous iron‐rich HH1‐phase sound velocity inelastic x‐ray scattering diamond anvil cell seismic scatterer lower mantle |
| title | Sound Velocities of the Hydrous Iron‐Rich HH1‐Phase: Implications for Lower Mantle Seismic Heterogeneities |
| title_full | Sound Velocities of the Hydrous Iron‐Rich HH1‐Phase: Implications for Lower Mantle Seismic Heterogeneities |
| title_fullStr | Sound Velocities of the Hydrous Iron‐Rich HH1‐Phase: Implications for Lower Mantle Seismic Heterogeneities |
| title_full_unstemmed | Sound Velocities of the Hydrous Iron‐Rich HH1‐Phase: Implications for Lower Mantle Seismic Heterogeneities |
| title_short | Sound Velocities of the Hydrous Iron‐Rich HH1‐Phase: Implications for Lower Mantle Seismic Heterogeneities |
| title_sort | sound velocities of the hydrous iron rich hh1 phase implications for lower mantle seismic heterogeneities |
| topic | hydrous iron‐rich HH1‐phase sound velocity inelastic x‐ray scattering diamond anvil cell seismic scatterer lower mantle |
| url | https://doi.org/10.1029/2024GL112963 |
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