Results 21 to 30 of about 4,939,312 (268)
GeosciencesWe collected approximately 500 ScS–S differential travel times passing beneath the Philippines with various azimuths to discuss whether there were azimuthal variations in the ScS–S time residuals.
Satoru Tanaka
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Geophysical Research Letters, 2019 Numerical experiments of thermochemical mantle convection in 2‐D spherical annulus geometry are performed to investigate the effects of compositional viscosity ratio (ΔηC) on the long‐term evolution of reservoirs of dense, primordial material in the ...
Yang Li +5 more
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Temperature in the Lower Mantle [PDF]
Geophysical Journal International, 1972 Summary A promising method for the estimate of the temperature in the lower mantle is demonstrated; it utilizes the best set of experimental data for rocks, namely, their densities, directly determined to pressures and temperatures comparable to those in the lower mantle, together with the most dependable properties of the lower mantle: its seismic ...
openaire +1 more source
A MICROINCLUSION OF LOWER-MANTLE ROCK AND OTHER MINERAL AND NITROGEN LOWER-MANTLE INCLUSIONS IN A DIAMOND [PDF]
The Canadian Mineralogist, 2015 A microcrystalline polymineral aggregate was identified as an inclusion in a diamond from the Rio Soriso area, Mato Grosso State, Brazil. It is composed of iron carbides, Fe-rich periclase (with exsolved magnesioferrite), and two orthorhombic, postspinel phases — Mg-Cr-Fe and Ca-Cr oxides, which are new mineral phases.
Kaminsky, F., Wirth, R., Schreiber, A.
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Electronic spin state of ferric iron in Al-bearing perovskite in the lower mantle [PDF]
, 2005 We investigate the effect of pressure on the electronic spin state of ferric iron on Al-bearing MgSiO3-perovskite using first-principle computations. Ferric iron (6.25 mol%) and Al ( 6.25 mol%) substitute for Mg and Si respectively.
Price, GD +11 more
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Thermoelasticity of Fe3+‐ and Al‐bearing bridgmanite: Effects of iron spin crossover
Geophysical Research Letters, 2016 We report ab initio (LDA + Usc) calculations of thermoelastic properties of ferric iron (Fe3+)‐ and aluminum (Al)‐bearing bridgmanite (MgSiO3 perovskite), the main Earth forming phase, at relevant pressure and temperature conditions and compositions ...
Gaurav Shukla +2 more
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CaSiO3 perovskite at lower mantle pressures [PDF]
, 2005 We investigate by first-principles the structural behavior of CaSiO3 perovskite up to lower mantle pressures. We confirm that the cubic perovskite modification is unstable at all pressures.
Price, GD +3 more
core
Mineral physics of the mantle [PDF]
, 1995 The last few years have seen intense interest in the global environment and climate change, and with it an increasing appreciation for the interactions between the atmosphere, biosphere, oceans and the solid earth.
Lars Stixrude, Stixrude, L
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Advanced Science, EarlyView.Complex microarchitectures emerge from simple flow‐driven transformations as static mixers iteratively reorient and split material domains. Coupled with diverse deposition strategies, chaotic printing provides an accessible platform for fabricating architected materials that support biologically and chemically relevant processes. ABSTRACT Nature builds
Edna Johana Bolívar‐Monsalve +7 more
wiley +1 more source
Ferropericlase Control of Lower Mantle Rheology: Impact of Phase Morphology
Geochemistry, Geophysics, Geosystems, 2020 The rheological properties of Earth's lower mantle play a key role for global mantle dynamics. The mineralogy of the lower mantle can be approximated as a bridgmanite‐ferropericlase mixture.
M. Thielmann +2 more
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