Disproportionation Equilibrium in Iron-Bearing Systems at Pressures above 100 Kbar with Applications to Chemistry of the Earth’s Mantle

1977 ◽  
pp. 236-249 ◽  
Author(s):  
H. K. Mao ◽  
P. M. Bell
Keyword(s):  
Earth’S Mantle ◽  
Iron Bearing

scholarly journals Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pure Fe-bridgmanite

2016 ◽  
Vol 2 (7) ◽  
pp. e1600427 ◽  
Author(s):  
Leyla Ismailova ◽  
Elena Bykova ◽  
Maxim Bykov ◽  
Valerio Cerantola ◽  
Catherine McCammon ◽  
...  
Keyword(s):  
Ferric Iron ◽  
Chemical Properties ◽  
Magnesium Silicate ◽  
Earth’S Mantle ◽  
Diamond Anvil ◽  
Laser Heated ◽  
Physical And Chemical ◽  
Iron Bearing ◽  
Tomography Data ◽  
And Chemical Properties

The physical and chemical properties of Earth’s mantle, as well as its dynamics and evolution, heavily depend on the phase composition of the region. On the basis of experiments in laser-heated diamond anvil cells, we demonstrate that Fe,Al-bearing bridgmanite (magnesium silicate perovskite) is stable to pressures over 120 GPa and temperatures above 3000 K. Ferric iron stabilizes Fe-rich bridgmanite such that we were able to synthesize pure iron bridgmanite at pressures between ~45 and 110 GPa. The compressibility of ferric iron–bearing bridgmanite is significantly different from any known bridgmanite, which has direct implications for the interpretation of seismic tomography data.

Melt mapped inside Earth’s mantle

Nature ◽  
2020 ◽  
Vol 586 (7830) ◽  
pp. 506-507
Author(s):  
Laura Cobden
Keyword(s):  
Earth’S Mantle

Numerical Analysis of Blast Furnace Performance Under Charging Iron-Bearing Burdens With High Reducibility

2007 ◽  
Vol 14 (2) ◽  
pp. 13-19 ◽  
Author(s):  
Man-sheng Chu ◽  
Xian-zhen Guo ◽  
Feng-man Shen ◽  
Jun-ichiro Yagi ◽  
Hiroshi Nogami
Keyword(s):  
Blast Furnace ◽  
Numerical Analysis ◽  
Furnace Performance ◽  
Blast Furnace Performance ◽  
Iron Bearing

Phase changes and convection in the Earth’s mantle

1965 ◽  
Vol 258 (1088) ◽  
pp. 276-283 ◽  
Keyword(s):  
Temperature Gradient ◽  
Phase Change ◽  
Initial Temperature ◽  
Phase Changes ◽  
Homogeneous Layer ◽  
Transformation Zone ◽  
Earth’S Mantle ◽  
Transition Level ◽  
Transformation Rates

A phase change may hinder or enhance convection, depending on its characteristics. Univariant transformations such as may occur in the mantle constitute a barrier to convection unless the motion starts at some distance above or below the transition level; an initial temperature gradient in excess of the adiabatic value is also required. Multivariant transformations only require, in the transformation zone, an initial gradient slightly greater than the adiabatic value for a homogeneous layer. The effect on convection of transformation rates is not likely to be serious.

The Earth's mantle

1968 ◽  
Vol 1 (3) ◽  
pp. 198-199
Author(s):  
D.W. Collinson
Keyword(s):  
Earth’S Mantle
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