Lower mantle
Seismic structure of the lower mantle
... Large-scale structures in the lower mantle derived from numerous tomographic imaging consistently show a belt of high velocity anomalies along the circum-Pacific (Figure 3.1a). Low velocity anomalies ...
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Iron-bearing Oxides, Silicate Glasses and Carbonates at Lower Mantle Pressures
... At lower mantle conditions, iron is expected to be preferentially incorporated into ferropericlase in the presence of bridgmanite or magnesium silicate post-perovskite [Kobayashi et ...the lower ...
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Extending shear wave tomography for the lower mantle using S and SKS arrival time data
... lowermost mantle, and the recovery using linearised inversion for the S + SKS data set which is able to image the deep ...the lower mantle and (ii) where the slab material has reached the ...
15
Numerical analysis of a mechanism of electrical conductivity of substance in the middle and lower mantle
... The method proposed is based on the Arrenius’ equation, that links electrical conductivity of solids with an enthalpy of activation, is studied and well-known distributions of temperature, pressure and electrical ...
5
Subduction to the lower mantle – a comparison between geodynamic and tomographic models
... the lower mantle, leading to increased lower mantle viscosi- ties in that region and thus slower slab sinking speed, while the global average viscosity could remain compatible with geoid ...
18
Analysis of Upper and Lower Mantle Structure Using Shear Waves
... DOC ANALYSIS OF UPPER AND LOWER MANTLE STRUCTURE USING SHEAR WAVES Thesis by Thorne Lay In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy California Institute of Techno[.] ...
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SiO2 glass density to lower mantle pressures
... effect on the final density of the melt at high pressure. The main parameter that controls the buoyancy of lower mantle melts is the iron content of the melt in comparison to that of the coexisting solids. ...
20
First-principles calculations of the lattice thermal conductivity of the lower mantle
... To estimate the lattice thermal conductivity of CaSiO3 perovskite, FeSiO3 perovskite and.. FeO wŸstite from our values for the magnesium end-members, we use the scaling derived.[r] ...
15
First-principles calculations of the lattice thermal conductivity of the lower mantle
... conditions, where the phonon mean free path is short and lattice thermal conductivity is... low Supplementary Material Fig.[r] ...
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Electronic absorption spectra of mantle minerals
... the mantle. At present, studies o f mantle convection patterns rely on the assumption that because o f the apparent opacity o f such minerals as oUvine and ferropericlase at pressure, then radiative ...
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I. Multi-scale dynamics of mantle plumes and II. Compressible thermo-chemical convection and the stability of mantle superplumes
... upper mantle to the very base of the ...deep mantle correlates with the position of past subduction [Richards and Engebretson, ...upper mantle to the CMB is variable, with substantial down dip and ...
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The Mantle Plume Debates
... About mantle plumes, there are a lot of definitions, two of which are in the ...a mantle plume—a thin, hot column of mantle material moves up the core-mantle ...the mantle source ...
6
Geomagnetic spikes on the core-mantle boundary
... finite mantle conductivity will smooth and delay core signals 24 , but does not move the source significantly closer to the surface because the mantle is thought to be weakly conductive everywhere except in a ...
11
The chemical case for Mercury mantle stripping
... heating (Kaula 1979; Rubie et al. 2015). Under these conditions, the liquid metal separates from the liquid sil- icate and accumulates in the core of the planet, ceasing to be in chemical equilibrium with silicate. ...
10
The strength of gravitational core-mantle coupling
... The inner core viscosity has important implications for its mode of convection. Deguen [2012] estimated that the preferred mode of convection (if the inner core does indeed convect) depends on the parameter = 𝜏 𝜙 ∕ 𝜏 , ...
7
Hydrogen isotope geochemistry of the mantle: constraints from back arc basin basalts and mantle xenoliths
... from 5.01 to 5.68 ‰. This average is comparable to that found in mid ocean ridge basalts using the same laboratory and techniques (5.40 ‰), (Eiler, Gronvold et al. 2000; Cooper, Eiler et al. 2004) and 0.37 ‰ lower ...
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Diamonds and the Mantle Geodynamics of Carbon
... and Mantle Geodynamics of Carbon (DMGC) consortium was con- ceived early in the existence of the Deep Carbon Observatory (DCO) for the speci fi c purpose of breaking down the traditional barriers to research on ...
40
Broadband modeling of earthquake source and mantle structures
... upper mantle (?), if the water content is less than ...upper mantle (Olivine-rich) and the transition zone (Wadsleyite-rich) ...upper mantle, while its depth extent would depend on the storage ...
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Original Article Mantle cell lymphoma with in situ or mantle zone growth pattern: a study of five cases and review of literature
... Mantle cell lymphoma (MCL) comprises 3 to 10% of non-Hodgkin lymphomas and has an aggressive clinical course with a median sur- vival of 3 to 5 years [1]. MCL is characterized by t(11;14)(q13;q32) translocation ...
9
Velocities of long period surface waves and microseisms and their use in structural studies. I. Mantle Love and mantle Rayleigh waves and the structure of the earth's upper mantle. II. Microseisms and their application to seismic exploration
... The phase velocity data are compared with theoretical dispersion curves of seven different ea rth models.. Th e significant features of these models are correlated [r] ...
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