Post-spinel transition of Fe2SiO4 ahrensite at high pressure and high temperature

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Masaki Akaogi, Natsuki Miyazaki, Taisuke Tajima, Hiroshi Kojitani
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Abstract

Phase relations for dissociation of spinel-structured Fe2SiO4 ahrensite to FeO wüstite + SiO2 stishovite have been determined up to 20 GPa and 1400 °C under the iron-wüstite buffer conditions by multianvil high-pressure and high-temperature experiments. The dissociation boundary determined is expressed by P (GPa) = 19.6 (± 1.0) – 3.0 (± 0.8) × 10−3 T (°C). The boundary with the negative dP/dT slope is placed by ~ 1–4 GPa at lower pressure at 1000–1200 °C than the previously determined boundaries whose slopes ranged from strongly positive to weakly negative. Thermodynamic calculation based on available thermodynamic data of ahrensite, wüstite and stishovite has provided the dissociation boundary which is in good agreement within the errors with that experimentally determined in this study. By combining the post-spinel phase relations in Fe2SiO4 determined in this study with available phase relations in the Fe2SiO4-Mg2SiO4 system, it is suggested that natural Fe2SiO4-rich ahrensite crystals found in the shocked Umbarger L6 chondrite crystallized in shock-induced melt pockets of the FeO- and SiO2-rich composition at pressures below ~ 13–16 GPa and above ~ 9–12 GPa in the shock process.

Abstract Image

高压高温下Fe2SiO4阿伦体的尖晶石后转变
通过多砧高压和高温实验,确定了尖晶石结构的Fe2SiO4铁榴石在铁- w榴石缓冲条件下,在20gpa和1400℃下解离为FeO w榴石+ SiO2硅榴石的相关系。解离边界用P (GPa) = 19.6(±1.0)- 3.0(±0.8)× 10−3 T(°C)表示。dP/dT斜率为负的边界在1000-1200°C的压力下放置在~ 1-4 GPa,比先前确定的斜率从强正到弱负的边界低。根据现有的阿伦石、钨辉石和辉石的热力学数据进行热力学计算,得到的解离边界与本研究中实验确定的解离边界在误差范围内符合得很好。结合本研究确定的Fe2SiO4中尖晶石后的相关系和Fe2SiO4- mg2sio4体系中可用的相关系,表明在Umbarger L6球粒陨石中发现的天然富Fe2SiO4阿氏体晶体在冲击过程中,在低于~ 13-16 GPa和高于~ 9-12 GPa的压力下,在富FeO和富sio2成分的冲击诱导熔袋中结晶。
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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
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)
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