The effect of rigidity or shear velocity of the inner core on the central density is discussed. Assuming maximum central densities of 13.6 g/cm 3 for an iron-nickel core and 13.0 g/cm 3 for an iron core, the discontinuity in density at the inner core boundary is estimated to be 1.2 g...
The range of values we have assumed in the discussion above are an inner core density of \(13000\) kg/m3, thermal conductivity of \(100-300\) W/m/K, heat capacity of \(650\) J/kg/K, and thermal expansion coefficient of \(10-30\times {10}^{-6}/{\text{K}}\), the range ...
However, the rheology of the inner core is poorly understood. We propose a mineral physics approach based on the density functional theory to infer the viscosity of hexagonal close packed (hcp) iron at the inner core pressure () and temperature (). As plastic deformation is rate-limited by ...
Thus, a density match with PREM for this composition would be achieved at a much lower simulation temperature of ∼4000K. Clearly, depending upon the temperature chosen, the inner-core density can be matched by that of hcp-Fe–Si alloys in the composition range considered here, but the ...
(2) preferential crystallization due to the transition in the deformation pattern over time coupled with density stratification64; and (3) the IC's growth could have been conditioned by the sedi- mentation of light elements at the ICB, which is linked to chemical variations in the outer core...
8.10.2.1 Composition of the Core The composition of the core remains ''an uncertain mixture of all the elements'' (Birch, 1952). The aver- age density of the Earth, the solar abundance of the elements, and the presence of iron meteorites, thought to be remnants of planetoid cores, all ...
In this scenario, the increase in light elements in the outer core as the IC solidified would generate radial transitions in density, and consequently different solidification and texturing patterns over time. The presence of the IMIC would thus represent a period of transition in the geodynamical ...
To address these issues, the amplitude ratio of PKiKP/PcP has been used for the inference of the density jump at the ICB as well as the shear velocity at the top of the inner core. Previous studies, however, were hampered by their large scatter, which precluded constraining relevant ...
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Also, the partition of light elements between melt and solid phases may also significantly affect the phase boundaries and the velocity and density jump across them. Moreover. the heat flow from the inner core could potentially be subject to local influences stemming from the laminated ICB ...