下地幔条件下MgO-SiO2-FeO体系的热物理性质和相图

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Michael H. G. Jacobs, Rainer Schmid-Fetzer, Arie P. van den Berg
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引用次数: 0

摘要

在之前的论文中,我们证明了多重爱因斯坦方法适用于确定地球上地幔和过渡带条件下MgO-FeO-SiO2体系的热物理性质和相图数据的一致性。在这里,我们将这项工作扩展到覆盖下地幔的条件下,温度范围在0 - 3000k之间,压力范围在20 - 140gpa之间,目的是确定哪些数据是一致的。所得数据库用于研究铁方石中自旋转变对其热物理性质和相图的影响。虽然由于缺乏实验数据,模型参数中存在权衡,但我们表明,模型的复杂性降低了,可以用来研究Fe3+对这些性质和相平衡的影响。我们发现,在地震密度和速度等熵中,铁长石的混相间隙、自旋跃迁和铁的价态的影响并不明显。我们证明Chust等人(J Geophys Res Solid Earth 122:9881-9920, 2018)得出的整体成分适合表示PREM和AK135地震数据,在实验不确定性范围内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermophysical properties and phase diagrams in the system MgO–SiO2–FeO at lower mantle conditions derived from a multiple-Einstein method

In a previous paper we showed that the multiple Einstein method is suitable to determine consistency of data on thermophysical properties and phase diagrams in the system MgO–FeO–SiO2 for upper mantle and transition zone conditions in the Earth. Here we extend this work to conditions covering the lower mantle, in the temperature range between 0 and 3000 K and pressure range between 20 and 140 GPa, with the goal to determine which data are consistent with each other. The resulting database is used to study the effect of the spin transition in ferropericlase on thermophysical properties and phase diagrams. Although trade-off is present in the model parameters due to the lack of experimental data, we show that models, reduced in complexity, can be used to study the effect of Fe3+ on these properties and phase equilibria. We show that the effect of the miscibility gap in ferropericlase, its spin transition and the valence state of Fe does not have a significant visibility in seismic density and velocities isentropes. We demonstrate that the overall composition derived by Chust et al. (J Geophys Res Solid Earth 122:9881–9920, 2018) is suitable to represent PREM and AK135 seismic data to within experimental uncertainty.

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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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