The effect of iron on the sound velocities of δ-AlOOH up to 135 GPa
δ-(Al,Fe)OOH is considered to be one of the most important hydrous phases on Earth, remaining stable under the extreme conditions throughout the mantle. The behavior of δ-(Al,Fe)OOH at high pressure is essential to understanding the deep water cycle. δ-(Al0.956Fe0.044)OOH crystals synthesized at 21 ...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-03-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987120302012 |
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| author | Xiaowan Su Chaoshuai Zhao Chaojia Lv Yukai Zhuang Nilesh Salke Liangxu Xu Hu Tang Huiyang Gou Xiaohui Yu Qiang Sun Jin Liu |
| author_facet | Xiaowan Su Chaoshuai Zhao Chaojia Lv Yukai Zhuang Nilesh Salke Liangxu Xu Hu Tang Huiyang Gou Xiaohui Yu Qiang Sun Jin Liu |
| author_sort | Xiaowan Su |
| collection | DOAJ |
| description | δ-(Al,Fe)OOH is considered to be one of the most important hydrous phases on Earth, remaining stable under the extreme conditions throughout the mantle. The behavior of δ-(Al,Fe)OOH at high pressure is essential to understanding the deep water cycle. δ-(Al0.956Fe0.044)OOH crystals synthesized at 21 GPa and 1473 K were investigated by high-pressure Brillouin light scattering spectroscopy and synchrotron X-ray diffraction up to 135.4 GPa in diamond anvil cells. The incorporation of 5 mol% FeOOH increases the unit-cell volume of δ-AlOOH by ~1% and decreases the shear-wave velocity (VS) by ~5% at 20–135 GPa. In particular, the compressional (VP) and shear (VS) wave velocities of δ-(Al0.956Fe0.044)OOH are 7%–16% and 10%–24% greater than all the major minerals in the mantle transition zone including wadsleyite, ringwoodite, and majorite. The distinctly high sound velocities of δ-(Al0.956Fe0.044)OOH at 20–25 GPa may contribute to the seismic anomalies observed at ~560–680 km depths in the cold and stagnant slab beneath Izu-Bonin and/or Korea. Furthermore, the VS of δ-(Al0.956Fe0.044)OOH is about 10% and 4%–12% lower than iron-bearing bridgmanite Mg0.96Fe0.05Si0.99O3 and ferropericlase (Mg0.92Fe0.08)O, respectively, under the lowermost mantle conditions, which might partially contribute to the large low-shear-velocity provinces and ultralow velocity zones at the bottom of the lower mantle. |
| first_indexed | 2024-03-12T20:12:58Z |
| format | Article |
| id | doaj.art-b93c1a13f723441cad09272ca5c8bf1d |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T20:12:58Z |
| publishDate | 2021-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-b93c1a13f723441cad09272ca5c8bf1d2023-08-02T01:33:12ZengElsevierGeoscience Frontiers1674-98712021-03-01122937946The effect of iron on the sound velocities of δ-AlOOH up to 135 GPaXiaowan Su0Chaoshuai Zhao1Chaojia Lv2Yukai Zhuang3Nilesh Salke4Liangxu Xu5Hu Tang6Huiyang Gou7Xiaohui Yu8Qiang Sun9Jin Liu10School of Earth and Space Sciences, Peking University, Beijing, 100871, ChinaCenter for High Pressure Science and Technology Advanced Research, Beijing, 100094, ChinaCenter for High Pressure Science and Technology Advanced Research, Beijing, 100094, ChinaCenter for High Pressure Science and Technology Advanced Research, Beijing, 100094, ChinaCenter for High Pressure Science and Technology Advanced Research, Beijing, 100094, ChinaCenter for High Pressure Science and Technology Advanced Research, Beijing, 100094, ChinaCenter for High Pressure Science and Technology Advanced Research, Beijing, 100094, ChinaCenter for High Pressure Science and Technology Advanced Research, Beijing, 100094, ChinaBeijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, ChinaSchool of Earth and Space Sciences, Peking University, Beijing, 100871, ChinaCenter for High Pressure Science and Technology Advanced Research, Beijing, 100094, China; Corresponding author.δ-(Al,Fe)OOH is considered to be one of the most important hydrous phases on Earth, remaining stable under the extreme conditions throughout the mantle. The behavior of δ-(Al,Fe)OOH at high pressure is essential to understanding the deep water cycle. δ-(Al0.956Fe0.044)OOH crystals synthesized at 21 GPa and 1473 K were investigated by high-pressure Brillouin light scattering spectroscopy and synchrotron X-ray diffraction up to 135.4 GPa in diamond anvil cells. The incorporation of 5 mol% FeOOH increases the unit-cell volume of δ-AlOOH by ~1% and decreases the shear-wave velocity (VS) by ~5% at 20–135 GPa. In particular, the compressional (VP) and shear (VS) wave velocities of δ-(Al0.956Fe0.044)OOH are 7%–16% and 10%–24% greater than all the major minerals in the mantle transition zone including wadsleyite, ringwoodite, and majorite. The distinctly high sound velocities of δ-(Al0.956Fe0.044)OOH at 20–25 GPa may contribute to the seismic anomalies observed at ~560–680 km depths in the cold and stagnant slab beneath Izu-Bonin and/or Korea. Furthermore, the VS of δ-(Al0.956Fe0.044)OOH is about 10% and 4%–12% lower than iron-bearing bridgmanite Mg0.96Fe0.05Si0.99O3 and ferropericlase (Mg0.92Fe0.08)O, respectively, under the lowermost mantle conditions, which might partially contribute to the large low-shear-velocity provinces and ultralow velocity zones at the bottom of the lower mantle.http://www.sciencedirect.com/science/article/pii/S1674987120302012Deep water cycleFe-bearing delta phaseSeismic anomaliesHigh pressure |
| spellingShingle | Xiaowan Su Chaoshuai Zhao Chaojia Lv Yukai Zhuang Nilesh Salke Liangxu Xu Hu Tang Huiyang Gou Xiaohui Yu Qiang Sun Jin Liu The effect of iron on the sound velocities of δ-AlOOH up to 135 GPa Geoscience Frontiers Deep water cycle Fe-bearing delta phase Seismic anomalies High pressure |
| title | The effect of iron on the sound velocities of δ-AlOOH up to 135 GPa |
| title_full | The effect of iron on the sound velocities of δ-AlOOH up to 135 GPa |
| title_fullStr | The effect of iron on the sound velocities of δ-AlOOH up to 135 GPa |
| title_full_unstemmed | The effect of iron on the sound velocities of δ-AlOOH up to 135 GPa |
| title_short | The effect of iron on the sound velocities of δ-AlOOH up to 135 GPa |
| title_sort | effect of iron on the sound velocities of δ alooh up to 135 gpa |
| topic | Deep water cycle Fe-bearing delta phase Seismic anomalies High pressure |
| url | http://www.sciencedirect.com/science/article/pii/S1674987120302012 |
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