中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 深海科学与工程研究所
  3. 中国科学院深海科学与工程研究所
  4. 深海科学研究部
  5. 地外海洋系统研究室
Effect of Al-Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature

文献类型：期刊论文

作者Xu, Chaowen5,6,7; Greaux, Steeve7; Li, Ying6; Sun, Fengxia6; Gao, Jing4; Qin, Fei3; Inoue, Toru1,2
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2024-06-01
卷号51期号:12页码:9
ISSN号0094-8276
DOI10.1029/2023GL107818
英文摘要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 similar to 10 wt.% Al-bearing SuB in cold subducting slabs could explain up to similar to 2% high velocity anomalies at the bottom of the mantle transition zone (500-660 km) while it turns into similar to 7.7% low velocity anomalies below 660 km. Al-bearing SuB is reportedly stable at mantle temperatures, where it could account for similar to 12.2% low velocity anomalies beneath subduction zones in the uppermost lower mantle. Among dense hydrous magnesium silicates, Superhydrous phaseB (SuB) is believed to hold large amount of water and transport it to the deep mantle. Recent studies showed that Al can largely increase the thermal stability region of SuB, suggesting this phase may also be an important carrier of water in the mantle transition zone (MTZ) and uppermost lower mantle (ULM). Here we investigated the sound velocities of Al-bearing SuB up to 24 GPa and 1300 K using ultrasonic interferometry combined with synchrotron X-ray techniques in a multi-anvil apparatus. We found that Al + H incorporation decreases adiabatic bulk modulus and shear modulus of SuB. Our results however suggest that this effect is less important than that of temperature. Based on our elasticity data, we calculated velocity of a hydrated pyrolite composition, containing up to 10% of Al-SuB along temperature profiles corresponding to cold slab and hot mantle at the depths of the MTZ and the ULM. We found that the presence of hydrous pyrolite may explain high velocity anomalies up to 660 km depth at MTZ while low velocity anomalies appear below 660 km along cold slab geotherm. Nevertheless, low velocity anomalies are generated in the whole depth range along a normal geotherm. We constrained the Al + H incorporation on sound velocities of superhydrous phase B (SuB) up to 24 GPa and 1300 K Al + H incorporation which promoted by increased temperature significantly affect velocities of SuB Accumulation of Al-bearing SuB can explain velocity contrast with various magnitude owing to the change of Al + H content with temperature
WOS关键词EQUATION-OF-STATE ; ELASTIC-WAVE VELOCITIES ; MANTLE TRANSITION ZONE ; HYDROUS MAGNESIUM SILICATES ; WATER TRANSPORT ; SEISMIC VELOCITIES ; STABILITY ; RINGWOODITE ; SYSTEM ; ANOMALIES
资助项目National Natural Science Foundation of China ; Open Foundation of the United Laboratory of High-Pressure Physics and Earthquake Science[2018B1708] ; Open Foundation of Key Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences[2019HPPES07] ; Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists (DC2)[DQXX2021-06] ; [42003050] ; [42073063] ; [41902035]
WOS研究方向Geology
语种英语
WOS记录号WOS:001247138600001
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China ; Open Foundation of the United Laboratory of High-Pressure Physics and Earthquake Science ; Open Foundation of Key Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences ; Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists (DC2)
源URL[http://ir.idsse.ac.cn/handle/183446/11560]  
专题深海科学研究部_地外海洋系统研究室
通讯作者Xu, Chaowen; Greaux, Steeve
作者单位1.Hiroshima Univ, Hiroshima Inst Plate Convergence Reg Res HiPeR, Higashihiroshima, Japan
2.Hiroshima Univ, Dept Earth & Planetary Syst Sci, Higashihiroshima, Japan
3.China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Extraterr Ocean Syst, Sanya, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
6.China Earthquake Adm CEA, Inst Earthquake Forecasting, Beijing, Peoples R China
7.Ehime Univ, Geodynam Res Ctr, Matsuyama, Japan
推荐引用方式
GB/T 7714		 Xu, Chaowen,Greaux, Steeve,Li, Ying,et al. Effect of Al-Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature[J]. GEOPHYSICAL RESEARCH LETTERS,2024,51(12):9.
APA Xu, Chaowen.,Greaux, Steeve.,Li, Ying.,Sun, Fengxia.,Gao, Jing.,...&Inoue, Toru.(2024).Effect of Al-Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature.GEOPHYSICAL RESEARCH LETTERS,51(12),9.
MLA Xu, Chaowen,et al."Effect of Al-Incorporation on the Sound Velocities of Superhydrous Phase B at High Pressure and High Temperature".GEOPHYSICAL RESEARCH LETTERS 51.12(2024):9.

入库方式： OAI收割

来源：深海科学与工程研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。