Shock Compression and Melting of an Fe-Ni-Si Alloy: Implications for the Temperature Profile of the Earth's Core and the Heat Flux Across the Core-Mantle Boundary

2018 ◽  
Vol 123 (2) ◽  
pp. 1314-1327 ◽  
Author(s):  
Youjun Zhang ◽  
Toshimori Sekine ◽  
Jung-Fu Lin ◽  
Hongliang He ◽  
Fusheng Liu ◽  
...  
Keyword(s):  
Heat Flux ◽  
Temperature Profile ◽  
Shock Compression ◽  
Earth’S Core ◽  
Earth's Core ◽  
Mantle Boundary ◽  
Core Mantle Boundary ◽  
The Core

scholarly journals Regional stratification at the top of Earth's core due to core–mantle boundary heat flux variations

2019 ◽  
Vol 12 (7) ◽  
pp. 575-580 ◽  
Author(s):  
Jon Mound ◽  
Chris Davies ◽  
Sebastian Rost ◽  
Jon Aurnou
Keyword(s):  
Heat Flux ◽  
Earth’S Core ◽  
Earth's Core ◽  
Mantle Boundary ◽  
Core Mantle Boundary

scholarly journals Reflection and transmission of seismic waves under initial stress at the earth's core-mantle boundary

1980 ◽  
Vol 3 (3) ◽  
pp. 591-598
Author(s):  
Sukhendu Dey ◽  
Sushil Kumar Addy
Keyword(s):  
Initial Stress ◽  
Seismic Waves ◽  
Reflection And Transmission Coefficients ◽  
Earth’S Core ◽  
Reflection And Transmission ◽  
Earth's Core ◽  
Mantle Boundary ◽  
Core Mantle Boundary ◽  
Transmission Coefficients ◽  
The Core

In the present paper the influence of the initial stress is shown on the reflection and transmission ofPwaves at the core-mantle boundary. Taking a particular value of the inherent initial stress, the variations of reflection and transmission coefficients with respect to the angle of emergence are represented by graphs. These graphs when compared with those having no initial stress show that the effect of the initial stress is to produce a reflectedPandSwaves with numerically higher amplitudes but a transmittedPwave with smaller amplitude. A method is also indicated in this paper to calculate the actual value of the initial stress near the core-mantle boundary by measuring the amplitudes of incident and reflectedPwaves.

scholarly journals Variation of thermal conductivity and heat flux at the Earth's core mantle boundary

2014 ◽  
Vol 390 ◽  
pp. 175-185 ◽  
Author(s):  
Michael W. Ammann ◽  
Andrew M. Walker ◽  
Stephen Stackhouse ◽  
James Wookey ◽  
Alessandro M. Forte ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Earth’S Core ◽  
Earth's Core ◽  
Mantle Boundary ◽  
Core Mantle Boundary

A study of the core-mantle boundary usingPwaves diffracted by the Earth's core

1966 ◽  
Vol 71 (24) ◽  
pp. 5943-5958 ◽  
Author(s):  
Shelton S. Alexander ◽  
Robert A. Phinney
Keyword(s):  
Earth’S Core ◽  
Earth's Core ◽  
Mantle Boundary ◽  
Core Mantle Boundary ◽  
The Core

Melting of iron–silicon alloy up to the core–mantle boundary pressure: implications to the thermal structure of the Earth’s core

2009 ◽  
Vol 37 (6) ◽  
pp. 353-359 ◽  
Author(s):  
Hidetoshi Asanuma ◽  
Eiji Ohtani ◽  
Takeshi Sakai ◽  
Hidenori Terasaki ◽  
Seiji Kamada ◽  
...  
Keyword(s):  
Thermal Structure ◽  
Earth’S Core ◽  
Earth's Core ◽  
Silicon Alloy ◽  
Mantle Boundary ◽  
Core Mantle Boundary ◽  
Iron Silicon ◽  
The Core

scholarly journals Thermal conductivity of Fe-Si alloys and thermal stratification in Earth’s core

2021 ◽  
Vol 119 (1) ◽  
pp. e2119001119
Author(s):  
Youjun Zhang ◽  
Kai Luo ◽  
Mingqiang Hou ◽  
Peter Driscoll ◽  
Nilesh P. Salke ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Pressure ◽  
Transport Properties ◽  
Outer Core ◽  
Earth’S Core ◽  
High Pressure And Temperature ◽  
Earth's Core ◽  
Mantle Boundary ◽  
Core Mantle Boundary ◽  
The Core

Light elements in Earth’s core play a key role in driving convection and influencing geodynamics, both of which are crucial to the geodynamo. However, the thermal transport properties of iron alloys at high-pressure and -temperature conditions remain uncertain. Here we investigate the transport properties of solid hexagonal close-packed and liquid Fe-Si alloys with 4.3 and 9.0 wt % Si at high pressure and temperature using laser-heated diamond anvil cell experiments and first-principles molecular dynamics and dynamical mean field theory calculations. In contrast to the case of Fe, Si impurity scattering gradually dominates the total scattering in Fe-Si alloys with increasing Si concentration, leading to temperature independence of the resistivity and less electron–electron contribution to the conductivity in Fe-9Si. Our results show a thermal conductivity of ∼100 to 110 W⋅m−1⋅K−1 for liquid Fe-9Si near the topmost outer core. If Earth’s core consists of a large amount of silicon (e.g., > 4.3 wt %) with such a high thermal conductivity, a subadiabatic heat flow across the core–mantle boundary is likely, leaving a 400- to 500-km-deep thermally stratified layer below the core–mantle boundary, and challenges proposed thermal convection in Fe-Si liquid outer core.

Hydromagnetic spin-up under conditions of the earth's core-mantle boundary

1978 ◽  
Vol 22 (3) ◽  
pp. 276-282
Author(s):  
Jozef Brestenský ◽  
Gustáv Siráň ◽  
I. Cupal
Keyword(s):  
Earth’S Core ◽  
Earth's Core ◽  
Mantle Boundary ◽  
Core Mantle Boundary
Sign in / Sign up

Export Citation Format

Share Document