Chemical composition of the lower mantle inferred from the equation of state of MgSiO 3 perovskite

1996 ◽  
Vol 354 (1711) ◽  
pp. 1371-1384 ◽  
Keyword(s):  
Chemical Composition ◽  
Equation Of State ◽  
Lower Mantle

Computation for Equation of States of (Mg0.92, Fe0.08)SiO3 Perovskite Based on Mie-Grüneisen-Debye Model

2014 ◽  
Vol 1046 ◽  
pp. 76-79
Author(s):  
Xiu Fang Chen
Keyword(s):  
High Pressure ◽  
Equation Of State ◽  
Lower Mantle ◽  
Perovskite Structure ◽  
Perovskite Phase ◽  
Debye Model ◽  
Thermal Pressure ◽  
Thermal Equation ◽  
Equation Of States ◽  
Prem Model

In this paper, the thermal equation of state (EOS) of (Mg0.92, Fe0.08)SiO3is computed by Birch-Murnaghan and Mie-Grüneisen-Debye equations and the related parameters are also analyzed. The value of and has little effect on EOS of (Mg0.92, Fe0.08)SiO3perovskite. The effect of EOS of (Mg0.92, Fe0.08)SiO3perovskite is mainly from the temperature under high pressure. The temperature is higher; the deviation of EOS relative to the PREM model is bigger. The thermal EOS complies with PREM model at T=2000K. The thermal pressure of (Mg0.92, Fe0.08)SiO3perovskite a constant only related to temperature at the lower mantle conditions. At the same time, the EOS of (Mg0.92, Fe0.08)SiO3perovskite is insensitive to the data of and at T=2000K, but when and the thermal EOS is more agreement with PREM model. That is to say, when the value of the and is in the range of 253~273 GPa and 3.69~4.23, (Mg0.92, Fe0.08)SiO3is the perovskite phase, and (Mg0.92, Fe0.08)SiO3perovskite structure remains stable at the mantle conditions.

Phase relations and equation-of-state of aluminous Mg-silicate perovskite and implications for Earth's lower mantle

2004 ◽  
Vol 222 (2) ◽  
pp. 501-516 ◽  
Author(s):  
M.J. Walter ◽  
A. Kubo ◽  
T. Yoshino ◽  
J. Brodholt ◽  
K.T. Koga ◽  
...  
Keyword(s):  
Equation Of State ◽  
Lower Mantle ◽  
Phase Relations

scholarly journals Shock wave equation of state of serpentine to 150 GPa: Implications for the occurrence of water in the Earth's lower mantle

1991 ◽  
Vol 96 (B11) ◽  
pp. 18011 ◽  
Author(s):  
James A. Tyburczy ◽  
Thomas S. Duffy ◽  
Thomas J. Ahrens ◽  
Manfred A. Lange
Keyword(s):  
Shock Wave ◽  
Wave Equation ◽  
Equation Of State ◽  
Lower Mantle

Applications of the modified Rydberg–Vinet equation-of-state to the lower mantle and core

2016 ◽  
Vol 30 (04) ◽  
pp. 1650015
Author(s):  
Zheng-Hua Fang
Keyword(s):  
Equation Of State ◽  
Reference Point ◽  
Lower Mantle ◽  
Earth Planet ◽  
The Core ◽  
Fitting Parameters ◽  
Fitting Accuracy

A modified Rydberg–Vinet equation-of-state (mRV EOS) with an arbitrary nonzero-pressure reference point, as is derived strictly from the related Rydberg potential, has been applied to the mantle and the core. The tests and comparisons demonstrate that mRV EOS is superior to the reciprocal [Formula: see text]-primed equation [see F. D. Stacey and P. M. Davis, Phys. Earth Planet. Inter. 142 (2004) 137] not only because of its higher fitting accuracy but also because it has fewer fitting parameters and is easier to use.

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