Nature, volume 430, issue 6998, pages 445-448
Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer
Oganov Artem R.
1
,
Ono Shigeaki
2
2
Institute for Frontier Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka-shi, Kanagawa, Japan
|
Publication type: Journal Article
Publication date: 2004-07-21
Multidisciplinary
Abstract
The Earth's lower mantle is believed to be composed mainly of (Mg,Fe)SiO3 perovskite, with lesser amounts of (Mg,Fe)O and CaSiO3 (ref. 1). But it has not been possible to explain many unusual properties of the lowermost ∼150 km of the mantle (the D″ layer) with this mineralogy. Here, using ab initio simulations and high-pressure experiments, we show that at pressures and temperatures of the D″ layer, MgSiO3 transforms from perovskite into a layered CaIrO3-type post-perovskite phase. The elastic properties of the post-perovskite phase and its stability field explain several observed puzzling properties of the D″ layer: its seismic anisotropy2, the strongly undulating shear-wave discontinuity at its top3,4,5,6 and possibly the anticorrelation between shear and bulk sound velocities7,8.
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17 publications, 2.13%
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17 publications, 2.13%
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Oganov A. R., Ono S. Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer // Nature. 2004. Vol. 430. No. 6998. pp. 445-448.
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Oganov A. R., Ono S. Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer // Nature. 2004. Vol. 430. No. 6998. pp. 445-448.
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TY - JOUR
DO - 10.1038/nature02701
UR - https://doi.org/10.1038%2Fnature02701
TI - Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer
T2 - Nature
AU - Oganov, Artem R.
AU - Ono, Shigeaki
PY - 2004
DA - 2004/07/21 00:00:00
PB - Springer Nature
SP - 445-448
IS - 6998
VL - 430
SN - 0028-0836
SN - 1476-4687
ER -
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@article{2004_Oganov,
author = {Artem R. Oganov and Shigeaki Ono},
title = {Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer},
journal = {Nature},
year = {2004},
volume = {430},
publisher = {Springer Nature},
month = {jul},
url = {https://doi.org/10.1038%2Fnature02701},
number = {6998},
pages = {445--448},
doi = {10.1038/nature02701}
}
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MLA
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Oganov, Artem R., and Shigeaki Ono. “Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer.” Nature, vol. 430, no. 6998, Jul. 2004, pp. 445-448. https://doi.org/10.1038%2Fnature02701.
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