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GSA Special Papers
Advances in High-Pressure Mineralogy
Author(s)
Eiji Ohtani
Eiji Ohtani
Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980-8578, Japan
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Geological Society of America

Volume
421
Copyright:
Geological Society of America
ISBN print:
9780813724218
Publication date:
January 01, 2007
Book Chapter
Discovery of post-perovskite phase transition and implications for the nature of the D″ layer of the mantle
Author(s)
Kei Hirose
Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
;
Kei Hirose
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Katsuyuki Kawamura
Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
Katsuyuki Kawamura
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Published:January 01, 2007
MgSiO3 perovskite is a principal mineral in the upper part of the lower mantle, but its stability and possible phase transition at greater depths have long been uncertain Recently, a new high-pressure MgSiO3 polymorph called “post-perovskite” was discovered above 125 GPa and 2500 K on the basis of X-ray diffraction measurements in a laser-heated diamond anvil cell (LH-DAC). Crystal structure of post-perovskite was first determined to be orthorhombic (space group: Cmcm) by molecular dynamics (MD) calculations. The first-principles theoretical calculations also confirmed the stability of this new phase. These results suggest that MgSiO3-rich post-perovskite is...
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Index Terms/Descriptors
- anisotropy
- body waves
- core-mantle boundary
- crystal structure
- D double prime layer
- elastic waves
- enthalpy
- high pressure
- lower mantle
- mantle
- molecular dynamics
- perovskite structure
- phase equilibria
- phase transitions
- polymorphism
- post-perovskite structure
- pressure
- S-waves
- seismic anomalies
- seismic waves
- simulation
- stability
- X-ray diffraction data
Citing Books via
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