| DOI: | 10.1002/2014GL062888
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| 论文题名: | Thermoelasticity of Fe2+-bearing bridgmanite |
| 作者: | Shukla G.; Wu Z.; Hsu H.; Floris A.; Cococcioni M.; Wentzcovitch R.M.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8833
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| EISSN: | 1944-8564
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| 出版年: | 2015
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| 卷: | 42, 期:6 | | 起始页码: | 1741
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| 结束页码: | 1749
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| 语种: | 英语
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| 英文关键词: | iron-bearing bridgmanite
; thermoelasticity
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| Scopus关键词: | Acoustic wave velocity measurement
; Calculations
; Elasticity
; Equations of state
; Shear flow
; Thermoelasticity
; Elastic properties
; Equation of state
; First-principles calculation
; High pressure and high temperature
; Intermediate spins
; Lateral displacements
; Longitudinal velocity
; Preliminary reference earth models
; Iron
; acoustics
; elasticity
; iron
; parameterization
; perovskite
; thermoelasticity
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| 英文摘要: | We present local density approximation augmented by the Hubbard-type correction calculations of high-temperature elastic properties of bridgmanite with composition (Mg(1-x)Fex2+)SiO3 for 0≤×≤0.125. Results of elastic moduli and acoustic velocities for the Mg end-member (x=0) agree very well with the latest high-pressure and high-temperature experimental measurements. In the iron-bearing system, we focus particularly on the change in thermoelastic parameters across the state change that occurs in ferrous iron above ∼30GPa, often attributed to a high-spin (HS) to intermediate-spin (IS) crossover but explained by first-principles calculations as a lateral displacement of substitutional iron in the perovskite cage. We show that the measured effect of this change on the equation of state of this system can be explained by the lateral displacement of substitutional iron and not by the HS to IS crossover. The calculated elastic properties of (Mg0.875Fe0.1252+)SiO3 along an adiabatic mantle geotherm somewhat overestimate longitudinal velocities but produce densities and shear velocities quite consistent with the Preliminary Reference Earth Model data throughout most of the lower mantle. Key Points Iron-bearing bridgmanite Elasticity Pressure-induced iron state change ©2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927739517&doi=10.1002%2f2014GL062888&partnerID=40&md5=04893ea0ed9dea8b14aea0c55abc3605
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8449
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | School of Physics and Astronomy, University of Minnesota, Twin Cities, Minneapolis, MN, United States
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| Recommended Citation: | |
Shukla G.,Wu Z.,Hsu H.,et al. Thermoelasticity of Fe2+-bearing bridgmanite[J]. Geophysical Research Letters,2015-01-01,42(6).
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