‌ Impact of minor aluminum incorporation on the high-pressure properties of stishovite

IF 1.5 4区地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Physics and Chemistry of Minerals Pub Date : 2026-03-13 DOI:10.1007/s00269-026-01344-0

Shuo Qu, Yuhui Jiang, Li Zhang, Peiyan Wu, Xiaofeng Lu, Jinpu Liu

{"title":"‌ Impact of minor aluminum incorporation on the high-pressure properties of stishovite","authors":"Shuo Qu, Yuhui Jiang, Li Zhang, Peiyan Wu, Xiaofeng Lu, Jinpu Liu","doi":"10.1007/s00269-026-01344-0","DOIUrl":null,"url":null,"abstract":"<div>\n \n Stishovite is a key constituent of subducting oceanic crust. Outside the stability fields of dense hydrous magnesium silicates, it remains stable in high-temperature regions of the deep mantle and serves as a significant reservoir for hydrogen. Numerous studies show that stishovite can incorporate over 3 wt% Al2O3, which can significantly lower the pressure required for the stishovite-to-post-stishovite phase transition. However, the stability of Al-rich stishovite under typical upper-mantle P-T conditions remains uncertain. Furthermore, the effect of even minor Al contents on this transition pressure requires further investigation. In this study, high-pressure and high-temperature synthesis experiments of Al-bearing stishovite were conducted at 11 GPa and 1300 °C under hydrous conditions. The results show no evidence for the existence of Al-rich stishovite in the base of the upper mantle. Furthermore, in situ high-pressure Raman spectroscopy performed on synthesized low-Al stishovite samples (up to 42 GPa at room temperature) reveals that the presence of a small amount of aluminum (1.41–1.57 wt% Al2O3) in stishovite reduces the pressure required for the stishovite–post-stishovite phase transition by at least 20 GPa. Compared to aluminum, hydrogen do not significantly affect this phase transition.\n </div>","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":"53 2","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics and Chemistry of Minerals","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1007/s00269-026-01344-0","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Stishovite is a key constituent of subducting oceanic crust. Outside the stability fields of dense hydrous magnesium silicates, it remains stable in high-temperature regions of the deep mantle and serves as a significant reservoir for hydrogen. Numerous studies show that stishovite can incorporate over 3 wt% Al₂O₃, which can significantly lower the pressure required for the stishovite-to-post-stishovite phase transition. However, the stability of Al-rich stishovite under typical upper-mantle P-T conditions remains uncertain. Furthermore, the effect of even minor Al contents on this transition pressure requires further investigation. In this study, high-pressure and high-temperature synthesis experiments of Al-bearing stishovite were conducted at 11 GPa and 1300 °C under hydrous conditions. The results show no evidence for the existence of Al-rich stishovite in the base of the upper mantle. Furthermore, in situ high-pressure Raman spectroscopy performed on synthesized low-Al stishovite samples (up to 42 GPa at room temperature) reveals that the presence of a small amount of aluminum (1.41–1.57 wt% Al₂O₃) in stishovite reduces the pressure required for the stishovite–post-stishovite phase transition by at least 20 GPa. Compared to aluminum, hydrogen do not significantly affect this phase transition.

Abstract Image

查看原文本刊更多论文

少量铝掺入对辉石高压性能的影响

辉长石是俯冲洋壳的重要组成部分。在致密含水硅酸镁的稳定场之外，它在深部地幔的高温区域保持稳定，是一个重要的氢储集层。大量研究表明，辉石中含有超过3 wt%的Al2O3，这可以显著降低辉石-后辉石相变所需的压力。然而，富铝辉石在典型上地幔P-T条件下的稳定性仍不确定。此外，即使是少量Al含量对该转变压力的影响也需要进一步研究。本研究在11gpa、1300℃条件下进行了含al辉石的高压高温合成实验。结果表明，上地幔底部没有富铝辉石存在的证据。此外，对合成的低铝针云石样品（室温下高达42 GPa）进行的原位高压拉曼光谱分析表明，在针云石中存在少量铝（1.41-1.57 wt% Al2O3），使针云石-针云石相变所需的压力降低了至少20 GPa。与铝相比，氢对这一相变没有显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Physics and Chemistry of Minerals 地学-材料科学：综合

CiteScore

2.90

自引率

14.30%

发文量

审稿时长

3 months

期刊介绍： Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)