globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.117053
论文题名:
Adiabatic heat flow in Mercury's core from electrical resistivity measurements of liquid Fe-8.5 wt%Si to 24 GPa
作者: Berrada M.; Secco R.A.; Yong W.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 568
语种: 英语
中文关键词: electrical resistivity ; heat flow ; high temperature and pressure ; iron-silicon alloy ; Mercury ; thermal conductivity
英文关键词: Heat convection ; Iron alloys ; Iron compounds ; Melting ; Mercury (metal) ; Silicon alloys ; Thermal conductivity ; Adiabatic heats ; Adiabats ; Direct measurement ; Electrical resistivity measurements ; Heat-flow ; High temperature and pressure ; Iron silicon ; Measurements of ; Mercury ; Thermal ; Electric conductivity ; electrical resistivity ; heat flow ; heat source ; high pressure ; high temperature ; melting ; Mercury (planet) ; thermal conductivity
英文摘要: The effect of the core thermal conductivity on the heat flow along the adiabat is investigated using direct measurements of electrical resistivity of Fe8.5Si at pressures from 5-24 GPa and temperatures above melting. Unexpected behaviour at low temperatures between 6-8 GPa may indicate an undocumented phase transition. Measurements of electrical resistivity at melting seem to remain constant at 127 μΩ⋅cm from 10-24 GPa, on both the solid and liquid side of the melting boundary. The adiabatic heat flow at the core side of Mercury's core-mantle boundary is estimated between 21.8-29.5 mW m−2, considerably higher than most models of an Fe-S or Fe-Si core yet similar to models of an Fe core. Comparing these results with thermal evolution models suggests that Mercury's dynamo remained thermally driven up to 0.08-0.22 Gyr, at which point the core became sub-adiabatic and stimulated a change from dominant thermal convection to dominant chemical convection arising from the growth of an inner core. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165410
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作者单位: Department of Earth Sciences, University of Western Ontario, London, ON N6A 3K7, Canada

Recommended Citation:
Berrada M.,Secco R.A.,Yong W.. Adiabatic heat flow in Mercury's core from electrical resistivity measurements of liquid Fe-8.5 wt%Si to 24 GPa[J]. Earth and Planetary Science Letters,2021-01-01,568
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