Sound velocity of CaSiO3 perovskite suggests the presence of basaltic crust in the Earth’s lower mantle

Nature ◽  
2019 ◽  
Vol 565 (7738) ◽  
pp. 218-221 ◽  
Author(s):  
Steeve Gréaux ◽  
Tetsuo Irifune ◽  
Yuji Higo ◽  
Yoshinori Tange ◽  
Takeshi Arimoto ◽  
...  
Keyword(s):  
Sound Velocity ◽  
Lower Mantle ◽  
Casio3 Perovskite ◽  
Basaltic Crust

Magnesium silicate perovskite and effect of iron oxidation state on its bulk sound velocity at the conditions of the lower mantle

2014 ◽  
Vol 393 ◽  
pp. 182-186 ◽  
Author(s):  
K. Glazyrin ◽  
T. Boffa Ballaran ◽  
D.J. Frost ◽  
C. McCammon ◽  
A. Kantor ◽  
...  
Keyword(s):  
Sound Velocity ◽  
Oxidation State ◽  
Lower Mantle ◽  
Iron Oxidation ◽  
Magnesium Silicate ◽  
Iron Oxidation State

scholarly journals CaSiO3 perovskite in diamond indicates the recycling of oceanic crust into the lower mantle

Nature ◽  
2018 ◽  
Vol 555 (7695) ◽  
pp. 237-241 ◽  
Author(s):  
F. Nestola ◽  
N. Korolev ◽  
M. Kopylova ◽  
N. Rotiroti ◽  
D. G. Pearson ◽  
...  
Keyword(s):  
Oceanic Crust ◽  
Lower Mantle ◽  
Casio3 Perovskite

scholarly journals Experimental evidence for silica-enriched Earth’s lower mantle with ferrous iron dominant bridgmanite

2020 ◽  
Vol 117 (45) ◽  
pp. 27899-27905
Author(s):  
Izumi Mashino ◽  
Motohiko Murakami ◽  
Nobuyoshi Miyajima ◽  
Sylvain Petitgirard
Keyword(s):  
Sound Velocity ◽  
Lower Mantle ◽  
Mantle Convection ◽  
Brillouin Scattering ◽  
Seismic Structure ◽  
The Earth ◽  
Diamond Anvil ◽  
Evolution Dynamics ◽  
Iron Bearing

Determination of the chemical composition of the Earth’s mantle is of prime importance to understand the evolution, dynamics, and origin of the Earth. However, there is a lack of experimental data on sound velocity of iron-bearing Bridgmanite (Brd) under relevant high-pressure conditions of the whole mantle, which prevents constraints on the mineralogical model of the lower mantle. To uncover these issues, we have conducted sound-velocity measurement of iron-bearing Brd in a diamond-anvil cell (DAC) up to 124 GPa using Brillouin scattering spectroscopy. Here we show that the sound velocities of iron-bearing Brd throughout the whole pressure range of lower mantle exhibit an apparent linear reduction with the iron content. Our data fit remarkably with the seismic structure throughout the lower mantle with Fe2+-enriched Brd, indicating that the greater part of the lower mantle could be occupied by Fe2+-enriched Brd. Our lower-mantle model shows a distinctive Si-enriched composition with Mg/Si of 1.14 relative to the upper mantle (Mg/Si = 1.25), which implies that the mantle convection has been inefficient enough to chemically homogenize the Earth’s whole mantle.

The fate of subducted basaltic crust in the Earth's lower mantle

Nature ◽  
10.1038/16225 ◽  
1999 ◽  
Vol 397 (6714) ◽  
pp. 53-56 ◽  
Author(s):  
Kei Hirose ◽  
Yingwei Fei ◽  
Yanzhang Ma ◽  
Ho-Kwang Mao
Keyword(s):  
Lower Mantle ◽  
Basaltic Crust

Mineral chemistry and density of subducted basaltic crust at lower-mantle pressures

Nature ◽  
1994 ◽  
Vol 372 (6508) ◽  
pp. 767-769 ◽  
Author(s):  
S. E. Kesson ◽  
J. D. Fitz Gerald ◽  
J. M. G. Shelley
Keyword(s):  
Lower Mantle ◽  
Mineral Chemistry ◽  
Basaltic Crust

scholarly journals Confirming a pyrolitic lower mantle using self-consistent pressure scales and new constraints on CaSiO3 perovskite

2016 ◽  
Vol 121 (7) ◽  
pp. 4876-4894 ◽  
Author(s):  
Ningyu Sun ◽  
Zhu Mao ◽  
Shuai Yan ◽  
Xiang Wu ◽  
Vitali B. Prakapenka ◽  
...  
Keyword(s):  
Lower Mantle ◽  
Self Consistent ◽  
Casio3 Perovskite

Sound velocity measurements of CaSiO3 perovskite to 133GPa and implications for lowermost mantle seismic anomalies

2012 ◽  
Vol 349-350 ◽  
pp. 1-7 ◽  
Author(s):  
Yuki Kudo ◽  
Kei Hirose ◽  
Motohiko Murakami ◽  
Yuki Asahara ◽  
Haruka Ozawa ◽  
...  
Keyword(s):  
Sound Velocity ◽  
Velocity Measurements ◽  
Casio3 Perovskite ◽  
Seismic Anomalies ◽  
Lowermost Mantle

Temperature Coefficient of Sound Velocity of Perovskite-Enstatite and Lateral Thermal Heterogeneity in Earth's Lower Mantle

2000 ◽  
Vol 17 (3) ◽  
pp. 218-220 ◽  
Author(s):  
Zi-Zheng Gong ◽  
Hong-Sen Xie ◽  
Fu-Qian Jing ◽  
Yong-Gang Liu ◽  
Jie Guo ◽  
...  
Keyword(s):  
Sound Velocity ◽  
Temperature Coefficient ◽  
Lower Mantle ◽  
Thermal Heterogeneity

scholarly journals Seismic velocities of CaSiO3 perovskite can explain LLSVPs in Earth’s lower mantle

Nature ◽  
2019 ◽  
Vol 572 (7771) ◽  
pp. 643-647 ◽  
Author(s):  
A. R. Thomson ◽  
W. A. Crichton ◽  
J. P. Brodholt ◽  
I. G. Wood ◽  
N. C. Siersch ◽  
...  
Keyword(s):  
Lower Mantle ◽  
Seismic Velocities ◽  
Casio3 Perovskite
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