Modeling viscosity of (Mg,Fe)O at lowermost mantle conditions
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TLDR
In this paper, a 2.5-dimensional dislocation dynamics approach is employed to model the viscosity of the lower mantle of aluminous (Mg,Fe)SiO_3 bridgmanite and ferropericlase.About:
This article is published in Physics of the Earth and Planetary Interiors.The article was published on 2019-02-01 and is currently open access. It has received 17 citations till now. The article focuses on the topics: Ferropericlase & Silicate perovskite.read more
Citations
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Melting behavior of (Mg,Fe)O solid solutions at high pressure
Li Zhang,Yingwei Fei +1 more
TL;DR: In this article, the authors reported the first systematic experimental study of melting behavior in the MgO-FeO system up to 3600 K and 7 GPa, indicating the ideal solution between solid and liquid (Mg,Fe)O in the mgOrich portion.
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Implications of the iron oxide phase transition on the interiors of rocky exoplanets
Federica Coppari,Raymond F. Smith,Jue Wang,Marius Millot,D. Kim,J. R. Rygg,Sebastien Hamel,Jon Eggert,Thomas S. Duffy +8 more
TL;DR: In this paper, the authors used nano-second X-ray diffraction and dynamic compression to experimentally investigate the atomic structure and density of iron oxide (FeO), one of the endmembers of the (Mg,Fe)O ferropericlase solid solution, up to 700 GPa, a pressure exceeding the core-mantle boundary of a 5 Earth masses planet.
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A molecular dynamics study of grain boundary diffusion in MgO
TL;DR: In this paper, the grain boundary diffusivity as a function of temperature and pressure was analyzed for the case of polycystalline periclase (MgO).
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Slab control on the mega-sized North Pacific ultra-low velocity zone
TL;DR: In this article , the authors used two orthogonal seismic ray paths to discover a mega-sized ULVZ at the northern edge of the Pacific Large Low Velocity Province (LLVP).
References
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Book
Theory of Dislocations
John Price Hirth,Jens Lothe +1 more
TL;DR: Dislocations in Isotropic Continua: Effects of Crystal Structure on Dislocations and Dislocation-Point-Defect Interactions at Finite temperatures.
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A crystallizing dense magma ocean at the base of the Earth’s mantle
TL;DR: It is shown that a stable layer of dense melt formed at the base of the mantle early in the Earth’s history would have undergone slow fractional crystallization, and would be an ideal candidate for an unsampled geochemical reservoir hosting a variety of incompatible species for an initial basal magma ocean thickness of about 1,000 km.
Book
Thermally Activated Mechanisms in Crystal Plasticity
Daniel Caillard,Jean-Luc Martin +1 more
TL;DR: Experimental Charecterization of Dislocation Mechanisms, Interactions between Dislocations and Small-size Obstacles, Frictional Forces in Metals and Alloys, Experimental Studies of Peierls-Naborro-type Friction Forces in METALS and Alloy, The Peierl-Nabarro Mechanisms in Covalent Crystals.
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Seismic Evidence for Partial Melt at the Base of Earth's Mantle
TL;DR: The presence of an intermittent layer at the base of Earth9s mantle with a maximum thickness near 40 kilometers and a compressional wave velocity depressed by ∼10 percent compared with that of the overlying mantle is most simply explained as the result of partial melt at this depth.
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Core–mantle boundary heat flow
TL;DR: In this paper, the role of thermal plumes in geodynamics and the thermal history of the Earth's core and lower mantle has been examined, and evidence for threefold higher heat flow across the core-mantle boundary is presented.