DOI: 10.1002/2014GL060670
论文题名: Shock compression of Fe-Ni-Si system to 280 GPa: Implications for the composition of the Earth's outer core
作者: Zhang Y. ; Sekine T. ; He H. ; Yu Y. ; Liu F. ; Zhang M.
刊名: Geophysical Research Letters
ISSN: 0094-9979
EISSN: 1944-9710
出版年: 2014
卷: 41, 期: 13 起始页码: 4554
结束页码: 4559
语种: 英语
英文关键词: Earth's outer core
; equation of state
; Fe-Ni-Si alloy
; light element
; shock wave
Scopus关键词: Chemical elements
; Equations of state
; Iron alloys
; Melting
; Nickel
; Shock waves
; Silicon
; Composition of the Earth
; Equation of state
; Light elements
; Model composition
; Particle velocities
; Preliminary reference earth models
; Shock compressions
; Two-stage light gas gun
; Silicon alloys
英文摘要: The shock Hugoniot of an Fe-9 wt %Ni-10 wt %Si system as a model of the Earth's core has been measured up to ~280 GPa using a two-stage light-gas gun. The samples had an average density of 6.853 (±0.036) g/cm3. The relationship between shock velocity (Us) and particle velocity (up) can be described by Us (km/s) = 3.95 (±0.15) + 1.53 (±0.05) up (km/s). The calculated Hugoniot temperatures and the melting curve indicate that the model composition melts above a shock pressure of ~168 GPa, which is significantly lower than the shock-melting pressure of iron (~225 GPa). A comparison of the pressure-density (P-ρ) profiles between the model composition and the preliminary reference Earth model gives a silicon content close to 10 wt %, necessary to compensate the density deficit in the Earth's outer core from seismological observations, if silicon is present as a major light element in the Fe-Ni core system. Key Points Hugoniot on Fe-Ni-Si system has been measured up to 280 GPa Pressure and density relation is compared with PREM Si content of the Earth's outer core is defined to be close to ~10 wt % ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904083844&doi=10.1002%2f2014GL060670&partnerID=40&md5=067137aad47b80fd616fb2559904b0c1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7243
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Systems Science, Hiroshima University, Higashihiroshima, Japan
Recommended Citation:
Zhang Y.,Sekine T.,He H.,et al. Shock compression of Fe-Ni-Si system to 280 GPa: Implications for the composition of the Earth's outer core[J]. Geophysical Research Letters,2014-01-01,41(13).