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DOI	10.1016/j.epsl.2021.117053
	Adiabatic heat flow in Mercury's core from electrical resistivity measurements of liquid Fe-8.5 wt%Si to 24 GPa
	Berrada M.; Secco R.A.; Yong W.
发表日期	2021
ISSN	0012821X
卷号	568
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203032
作者单位	Department of Earth Sciences, University of Western Ontario, London, ON N6A 3K7, Canada
推荐引用方式 GB/T 7714	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],2021,568.
APA	Berrada M.,Secco R.A.,&Yong W..(2021).Adiabatic heat flow in Mercury's core from electrical resistivity measurements of liquid Fe-8.5 wt%Si to 24 GPa.Earth and Planetary Science Letters,568.
MLA	Berrada M.,et al."Adiabatic heat flow in Mercury's core from electrical resistivity measurements of liquid Fe-8.5 wt%Si to 24 GPa".Earth and Planetary Science Letters 568(2021).