scholarly journals Single‐crystal elasticity of MgSiO 3 bridgmanite to mid‐lower mantle pressure

2021 ◽  
Author(s):  
G. Criniti ◽  
A. Kurnosov ◽  
T. Boffa Ballaran ◽  
D. J. Frost
Keyword(s):  
Single Crystal ◽  
Lower Mantle

Single-crystal synchrotron X-ray diffraction study of wüstite and magnesiowüstite at lower-mantle pressures

2005 ◽  
Vol 12 (5) ◽  
pp. 577-583 ◽  
Author(s):  
Steven D. Jacobsen ◽  
Jung-Fu Lin ◽  
Ross J. Angel ◽  
Guoyin Shen ◽  
Vitali B. Prakapenka ◽  
...  
Keyword(s):  
Single Crystal ◽  
Diffraction Study ◽  
Lower Mantle ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Water Concentration in Single‐Crystal (Al,Fe)‐Bearing Bridgmanite Grown From the Hydrous Melt: Implications for Dehydration Melting at the Topmost Lower Mantle

2019 ◽  
Vol 46 (17-18) ◽  
pp. 10346-10357 ◽  
Author(s):  
Suyu Fu ◽  
Jing Yang ◽  
Shun‐ichiro Karato ◽  
Alexander Vasiliev ◽  
Mikhail Yu. Presniakov ◽  
...  
Keyword(s):  
Single Crystal ◽  
Lower Mantle ◽  
Water Concentration ◽  
Dehydration Melting ◽  
Hydrous Melt

Single-crystal equation of state of phase D to lower mantle pressures and the effect of hydration on the buoyancy of deep subducted slabs

2013 ◽  
Vol 118 (12) ◽  
pp. 6124-6133 ◽  
Author(s):  
A. D. Rosa ◽  
M. Mezouar ◽  
G. Garbarino ◽  
P. Bouvier ◽  
S. Ghosh ◽  
...  
Keyword(s):  
Equation Of State ◽  
Single Crystal ◽  
Lower Mantle

scholarly journals Incorporation mechanism of Fe and Al into bridgmanite in a subducting mid-ocean ridge basalt and its crystal chemistry

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Akihiko Nakatsuka ◽  
Hiroshi Fukui ◽  
Seiji Kamada ◽  
Naohisa Hirao ◽  
Makio Ohkawa ◽  
...  
Keyword(s):  
Single Crystal ◽  
Bond Length ◽  
Lower Mantle ◽  
Structural Distortion ◽  
Ridge Basalt ◽  
Mid Ocean Ridge ◽  
Coupled Substitution ◽  
The Difference ◽  
A Site ◽  
Ocean Ridge

AbstractThe compositional difference between subducting slabs and their surrounding lower-mantle can yield the difference in incorporation mechanism of Fe and Al into bridgmanite between both regions, which should cause heterogeneity in physical properties and rheology of the lower mantle. However, the precise cation-distribution has not been examined in bridgmanites with Fe- and Al-contents expected in a mid-ocean ridge basalt component of subducting slabs. Here we report on Mg0.662Fe0.338Si0.662Al0.338O3 bridgmanite single-crystal characterized by a combination of single-crystal X-ray diffraction, synchrotron 57Fe-Mössbauer spectroscopy and electron probe microanalysis. We find that the charge-coupled substitution AMg2+  + BSi4+  ↔ AFe3+(high-spin) + BAl3+ is predominant in the incorporation of Fe and Al into the practically eightfold-coordinated A-site and the sixfold-coordinated B-site in bridgmanite structure. The incorporation of both cations via this substitution enhances the structural distortion due to the tilting of BO6 octahedra, yielding the unusual expansion of mean <A–O> bond-length due to flexibility of A–O bonds for the structural distortion, in contrast to mean <B–O> bond-length depending reasonably on the ionic radius effect. Moreover, we imply the phase-transition behavior and the elasticity of bridgmanite in slabs subducting into deeper parts of the lower mantle, in terms of the relative compressibility of AO12 (practically AO8) and BO6 polyhedra.

Elasticity of single-crystal NAL phase at high pressure: A potential source of the seismic anisotropy in the lower mantle

2016 ◽  
Vol 121 (8) ◽  
pp. 5696-5707 ◽  
Author(s):  
Ye Wu ◽  
Jing Yang ◽  
Xiang Wu ◽  
Maoshuang Song ◽  
Takashi Yoshino ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystal ◽  
Lower Mantle ◽  
Seismic Anisotropy ◽  
Potential Source ◽  
Nal Phase

scholarly journals High-spin Fe2+ and Fe3+ in single-crystal aluminous bridgmanite in the lower mantle

2016 ◽  
Vol 43 (13) ◽  
pp. 6952-6959 ◽  
Author(s):  
Jung-Fu Lin ◽  
Zhu Mao ◽  
Jing Yang ◽  
Jin Liu ◽  
Yuming Xiao ◽  
...  
Keyword(s):  
Single Crystal ◽  
High Spin ◽  
Lower Mantle

Single-crystal elasticity of (Al,Fe)-bearing bridgmanite and seismic shear wave radial anisotropy at the topmost lower mantle

2019 ◽  
Vol 518 ◽  
pp. 116-126 ◽  
Author(s):  
Suyu Fu ◽  
Jing Yang ◽  
Noriyoshi Tsujino ◽  
Takuo Okuchi ◽  
Narangoo Purevjav ◽  
...  
Keyword(s):  
Single Crystal ◽  
Shear Wave ◽  
Lower Mantle ◽  
Seismic Shear ◽  
Radial Anisotropy
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