Forsterite to wadsleyite phase transformation under shear stress and consequences for the Earth's mantle transition zone

2011 ◽  
Vol 184 (1-2) ◽  
pp. 91-104 ◽  
Author(s):  
S. Demouchy ◽  
D. Mainprice ◽  
A. Tommasi ◽  
H. Couvy ◽  
F. Barou ◽  
...  
Keyword(s):  
Shear Stress ◽  
Phase Transformation ◽  
Transition Zone ◽  
Mantle Transition Zone ◽  
Earth’S Mantle

Slab dehydration in the Earth's mantle transition zone

2006 ◽  
Vol 251 (1-2) ◽  
pp. 156-167 ◽  
Author(s):  
Guillaume Richard ◽  
David Bercovici ◽  
Shun-Ichiro Karato
Keyword(s):  
Transition Zone ◽  
Mantle Transition Zone ◽  
Earth’S Mantle ◽  
Slab Dehydration

scholarly journals High-pressure phase of brucite stable at Earth’s mantle transition zone and lower mantle conditions

2016 ◽  
Vol 113 (49) ◽  
pp. 13971-13976 ◽  
Author(s):  
Andreas Hermann ◽  
Mainak Mookherjee
Keyword(s):  
High Pressure ◽  
Transition Zone ◽  
Lower Mantle ◽  
Direct Detection ◽  
Geophysical Methods ◽  
High Pressure Phase ◽  
Mantle Transition Zone ◽  
Earth’S Mantle ◽  
3D Network ◽  
Pressure Phase

We investigate the high-pressure phase diagram of the hydrous mineral brucite, Mg(OH)2, using structure search algorithms and ab initio simulations. We predict a high-pressure phase stable at pressure and temperature conditions found in cold subducting slabs in Earth’s mantle transition zone and lower mantle. This prediction implies that brucite can play a much more important role in water transport and storage in Earth’s interior than hitherto thought. The predicted high-pressure phase, stable in calculations between 20 and 35 GPa and up to 800 K, features MgO6 octahedral units arranged in the anatase–TiO2 structure. Our findings suggest that brucite will transform from a layered to a compact 3D network structure before eventual decomposition into periclase and ice. We show that the high-pressure phase has unique spectroscopic fingerprints that should allow for straightforward detection in experiments. The phase also has distinct elastic properties that might make its direct detection in the deep Earth possible with geophysical methods.

Phase transformations of Ca3Al2Si3O12 grossular garnet to the depths of the Earth's mantle transition zone

2011 ◽  
Vol 185 (3-4) ◽  
pp. 89-99 ◽  
Author(s):  
Steeve Gréaux ◽  
Norimasa Nishiyama ◽  
Yoshio Kono ◽  
Laurent Gautron ◽  
Hiroaki Ohfuji ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Transition Zone ◽  
Mantle Transition Zone ◽  
Earth’S Mantle ◽  
Grossular Garnet

scholarly journals Rheology of Mg2 GeO4 olivine and spinel harzburgite: Implications for Earth's mantle transition zone

2015 ◽  
Vol 42 (7) ◽  
pp. 2212-2218 ◽  
Author(s):  
F. Shi ◽  
J. Zhang ◽  
G. Xia ◽  
Z. Jin ◽  
H. W. Green
Keyword(s):  
Transition Zone ◽  
Mantle Transition Zone ◽  
Earth’S Mantle

Redox-Induced Destabilization of Dolomite at Earth’s Mantle Transition Zone

2021 ◽  
Vol 32 (4) ◽  
pp. 880-886
Author(s):  
Tianlei Zhai ◽  
Shengxuan Huang ◽  
Shan Qin ◽  
Jingjing Niu ◽  
Yu Gong
Keyword(s):  
Transition Zone ◽  
Mantle Transition Zone ◽  
Earth’S Mantle

scholarly journals Evolution of diamond-forming systems of the mantle transition zone: ringwoodite peritectic reaction (Mg,Fe)2SiO4 (experiment AT 20 GPa)

2019 ◽  
Vol 64 (9) ◽  
pp. 986-994
Author(s):  
А. V. Spivak ◽  
Yu. А. Litvin ◽  
Е. S. Zakharchenko ◽  
D. А. Simonova ◽  
L. S. Dubrovinsky
Keyword(s):  
Experimental Study ◽  
Transition Zone ◽  
Lower Mantle ◽  
Peritectic Reaction ◽  
Mantle Transition Zone ◽  
Earth’S Mantle ◽  
Silicate Carbonate ◽  
Melting Relations ◽  
Carbonate Melt

The peritectic reaction of ringwoodite (Mg,Fe)2SiO4 and silicate-carbonate melt with formation of magnesiowustite (Fe,Mg)O, stishovite SiO2 and Mg, Na, Ca, K-carbonates is revealed by experimental study at 20 GPa of melting relations of the multicomponent MgO-FeO-SiO2-Na2CO3-CaCO3-K2CO3 system of the Earth’s mantle transition zone. A reaction of CaCO3 and SiO2 with the formation of Ca-perovskite CaSiO3 is also detected. It is shown that the peritectic reaction of ringwoodite and melt with the formation of stishovite physic-chemically controls the fractional ultrabasic-basic evolution of both magmatic and diamond-forming systems of the deep horizons of the transition zone up to its boundary with the Earth’s lower mantle.

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