New hydrous phases in the Al2O3-SiO2-H2O system under the mantle transition zone conditions
文献类型：期刊论文
| 作者 | Wang, Baoyun5; Liu, Jin4; Fu, Suyu3; Xiao, Pu2; Li, Li2; Ding, Xing1; Xiao, Wansheng1 |
| 刊名 | SCIENCE CHINA-EARTH SCIENCES
 |
| 出版日期 | 2023 |
| 卷号 | 66期号:4页码:730-737 |
| 关键词 | HIGH-PRESSURE HIGH-TEMPERATURE STABILITY WATER INCLUSIONS ALSIO3OH RAMAN EGG DECOMPOSITION DIAMONDS |
| ISSN号 | 1674-7313 |
| DOI | 10.1007/s11430-022-1033-2 |
| 英文摘要 | Hydrous minerals in the subducting slabs are potential water carriers into the deep mantle, and thus the synthesis of new hydrous phases is significant in our understanding of water circulation throughout the Earth’s interior. In this study, we report the two new hydrous phases, Al2SiO6H2 and Al5.5Si4O18H3.5 (hereafter referred to simply as phases Psi and Phi, respectively), which are synthesized in the Al2O3-SiO2-H2O system at 15.5 GPa, 1400°C and 17.5 GPa, 1600°C by using Sakura 2500-ton multi-anvil apparatus. The luminescence spectra of Cr3+ show the phase Psi has characteristic peaks at 687, 693 and 705 nm, while phase Phi has characteristic peaks at 691, 696 and 708 nm. Single-crystal X-ray diffraction (SCXRD) refinements yield a monoclinic structure of both phases (space group P21) with ideal chemical formulae of Al2SiO6H2 and Al5.5Si4O18H3.5, respectively. The determined lattice parameters for phase Psi are a=9.4168±0.0016 ?, b=4.3441±0.0007 ?, c=9.4360±0.002 ?, and β=119.726±0.005° at ambient pressure and 300 K, while the phase Phi has a=7.2549±0.0018 ?, b=4.3144±0.001 ?, c=8.0520±0.002 ?, and β=01.740±0.009° at ambient pressure and 250 K. Electron microprobe analyses (EPMA) show the chemical compositions of phases Psi and Phi to be Al1.99Si0.85O6H2.62 and Al5.58Si2.81O18H8.03, respectively, which slightly deviate from the ideal formulae inferred from SCXRD measurements. This may result from the disorder or substitution of Al and Si by H in the crystal structures under our synthesis conditions. Our study suggests that phases Psi and Phi are the two potential water carriers at the upper part of the mantle transitions zone, providing new insights into how deep water is stored in this region. ? 2023, Science China Press. |
| WOS研究方向 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000956043000001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80208]  |
| 专题 | 同位素地球化学国家重点实验室 中国科学院矿物学与成矿学重点实验室 |
| 作者单位 | 1.Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou; 510640, China 2.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou; 510640, China 3.Department of Earth and Planetary Science, the University of Tokyo, Tokyo; 1130033, Japan 4.Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing; 100193, China 5.College of Material and Chemical Engineering, Tongren University, Tongren; 554300, China |
| 推荐引用方式 GB/T 7714 | Wang, Baoyun,Liu, Jin,Fu, Suyu,et al. New hydrous phases in the Al2O3-SiO2-H2O system under the mantle transition zone conditions[J]. SCIENCE CHINA-EARTH SCIENCES,2023,66(4):730-737. |
| APA | Wang, Baoyun.,Liu, Jin.,Fu, Suyu.,Xiao, Pu.,Li, Li.,...&Xiao, Wansheng.(2023).New hydrous phases in the Al2O3-SiO2-H2O system under the mantle transition zone conditions.SCIENCE CHINA-EARTH SCIENCES,66(4),730-737. |
| MLA | Wang, Baoyun,et al."New hydrous phases in the Al2O3-SiO2-H2O system under the mantle transition zone conditions".SCIENCE CHINA-EARTH SCIENCES 66.4(2023):730-737. |
入库方式： OAI收割
来源：广州地球化学研究所
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