Abstract
MgSiO3 perovskite is believed to be a dominant mineral at least in the upper part of the Earth's lower mantle, but its stability and possible phase transition in deeper levels were not known. Recently we discovered the phase transition from MgSiO3 perovskite to a new high-pressure form (space group: Cmcm) above 125 GPa and 2500 K on the basis of in-situ x-ray diffraction measurements [1]. This phase transition is most likely responsible for the origin of the D" seismic discontinuity observed around 2700 km depth, and the MgSiO3 post-perovskite phase is a main constituent mineral in the D" region. Here we introduce the details of high-pressure experiment and crystal structure determination, and discuss the seismic anomalies in the lowermost mantle.
| Original language | English |
|---|---|
| Pages (from-to) | 265-274 |
| Number of pages | 10 |
| Journal | Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu |
| Volume | 14 |
| Issue number | 3 |
| Publication status | Published - 2004 |
| Externally published | Yes |
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Keywords
- Crystal structure analysis
- D" seismic discontinuity
- Leaser-heated diamond-anvil cell
- Lower mantle
- MgSiO
- Phase boundary
- Post-perovskite phase
- Ultra high pressure
ASJC Scopus subject areas
- Chemistry (miscellaneous)
Cite this
Discovery of post-perovskite phase transition in MgSiO3 and the earth's lowermost mantle. / Hirose, Kei; Kawamura, Katsuyuki.
In: Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu, Vol. 14, No. 3, 2004, p. 265-274.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Discovery of post-perovskite phase transition in MgSiO3 and the earth's lowermost mantle
AU - Hirose, Kei
AU - Kawamura, Katsuyuki
PY - 2004
Y1 - 2004
N2 - MgSiO3 perovskite is believed to be a dominant mineral at least in the upper part of the Earth's lower mantle, but its stability and possible phase transition in deeper levels were not known. Recently we discovered the phase transition from MgSiO3 perovskite to a new high-pressure form (space group: Cmcm) above 125 GPa and 2500 K on the basis of in-situ x-ray diffraction measurements [1]. This phase transition is most likely responsible for the origin of the D" seismic discontinuity observed around 2700 km depth, and the MgSiO3 post-perovskite phase is a main constituent mineral in the D" region. Here we introduce the details of high-pressure experiment and crystal structure determination, and discuss the seismic anomalies in the lowermost mantle.
AB - MgSiO3 perovskite is believed to be a dominant mineral at least in the upper part of the Earth's lower mantle, but its stability and possible phase transition in deeper levels were not known. Recently we discovered the phase transition from MgSiO3 perovskite to a new high-pressure form (space group: Cmcm) above 125 GPa and 2500 K on the basis of in-situ x-ray diffraction measurements [1]. This phase transition is most likely responsible for the origin of the D" seismic discontinuity observed around 2700 km depth, and the MgSiO3 post-perovskite phase is a main constituent mineral in the D" region. Here we introduce the details of high-pressure experiment and crystal structure determination, and discuss the seismic anomalies in the lowermost mantle.
KW - Crystal structure analysis
KW - D" seismic discontinuity
KW - Leaser-heated diamond-anvil cell
KW - Lower mantle
KW - MgSiO
KW - Phase boundary
KW - Post-perovskite phase
KW - Ultra high pressure
UR - http://www.scopus.com/inward/record.url?scp=4644303120&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4644303120&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:4644303120
VL - 14
SP - 265
EP - 274
JO - Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
JF - Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
SN - 0917-639X
IS - 3
ER -