Thermoelastic properties of ferropericlase Thermoelastic properties of ferropericlase R. Wentzcovitch Dept. of Chemical Engineering and Materials Science, Minnesota Supercomputing Institute J. F. Justo, C. da Silva, Z. Wu Dept. of Chemical Engineering and Materials Science T. Tsuchiya Ehime University, Japan
Thermoelastic properties of ferropericlase. Thermoelastic properties of ferropericlase. R. Wentzcovitch Dept. of Chemical Engineering and Materials Science, Minnesota Supercomputing Institute J. F. Justo , C. da Silva, Z. Wu Dept. of Chemical Engineering and Materials Science - PowerPoint PPT Presentation
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Thermoelastic properties of ferropericlase
Thermoelastic properties of ferropericlase
R. WentzcovitchDept. of Chemical Engineering and Materials Science,
Minnesota Supercomputing Institute
J. F. Justo, C. da Silva, Z. WuDept. of Chemical Engineering and Materials Science
Wave Velocities Along Mantle Wave Velocities Along Mantle GeothermGeotherm
6%
-9%
-15%
3%
1150 km 1580 km
SummarySummary
HS-LS transition in (Mg1-xFex)O is well reproduced theoretically
There is a strong softening in the bulk modulus across the spin transition. This effect broadens and decreases with temperature
Along a lower mantle geotherm this softening is more pronounced between 45-70 GPa, i.e., 1150-1580 km
The shear modulus increases monotonically in the same region
Transition can produce negative values of R/s in the upper part of the lower mantle
The softening will likely occur also in ferrosilicate perovskite
The Si/(Mg+Fe) ratio in the lower mantle should increase from pyrolitic values because of the spin transtions in ferropericlase and ferrosilicate perovskite
AcknowledgementsAcknowledgements
NSF/EAR 0135533 NSF/EAR 0230319NSF/ITR 0428774Japan Society for the Promotion of Science (JSPS)Brazilian Agency CNPq