scholarly journals Fluid Dynamics of Earth’s Core: Geodynamo, Inner Core Dynamics, Core Formation

2019 ◽  
pp. 129-212
Author(s):  
Renaud Deguen ◽  
Marine Lasbleis
Keyword(s):  
Fluid Dynamics ◽  
Inner Core ◽  
Core Formation ◽  
Earth’S Core ◽  
Earth's Core ◽  
Core Dynamics

scholarly journals Wave velocities in the earth's core

1958 ◽  
Vol 48 (4) ◽  
pp. 301-314
Author(s):  
B. Gutenberg
Keyword(s):  
Travel Time ◽  
Transition Zone ◽  
Southern California ◽  
Inner Core ◽  
Travel Times ◽  
Earth’S Core ◽  
Earth's Core ◽  
The Core ◽  
Wave Velocities

Abstract More than 700 seismograms of 39 shocks recorded mainly in southern California at epicentral distances between 105 and 140 degrees are used to investigate records of phases which have penetrated the earth's core. Properties of PKIKP, SKP, SKIKP, PKS, and PKIKS are discussed. Portions of travel-time curves of these phases are revised. Travel times of waves starting and ending at the surface of the core, and wave velocities in the core, are recalculated. Between about 1,500 and 1,200 km. from the earth's center in the transition zone from the liquid outer to the probably solid inner core, waves having lengths of the order of 10 km. travel faster than longer waves. This is probably caused by a rather rapid increase in viscosity toward the earth's center in this transition zone.

Systematics of metal–silicate partitioning for many siderophile elements applied to Earth’s core formation

2011 ◽  
Vol 75 (6) ◽  
pp. 1451-1489 ◽  
Author(s):  
Julien Siebert ◽  
Alexandre Corgne ◽  
Frederick J. Ryerson
Keyword(s):  
Core Formation ◽  
Earth’S Core ◽  
Earth's Core ◽  
Metal Silicate ◽  
Siderophile Elements

The Thermal Conductivity of Earth's Core: A Key Geophysical Parameter's Constraints and Uncertainties

2018 ◽  
Vol 46 (1) ◽  
pp. 47-66 ◽  
Author(s):  
Q. Williams
Keyword(s):  
Thermal Conductivity ◽  
High Pressures ◽  
Inner Core ◽  
Thermal Evolution ◽  
Magnetic Moments ◽  
Earth’S Core ◽  
Earth's Core ◽  
Current State ◽  
Core Conditions

The thermal conductivity of iron alloys at high pressures and temperatures is a critical parameter in governing ( a) the present-day heat flow out of Earth's core, ( b) the inferred age of Earth's inner core, and ( c) the thermal evolution of Earth's core and lowermost mantle. It is, however, one of the least well-constrained important geophysical parameters, with current estimates for end-member iron under core-mantle boundary conditions varying by about a factor of 6. Here, the current state of calculations, measurements, and inferences that constrain thermal conductivity at core conditions are reviewed. The applicability of the Wiedemann-Franz law, commonly used to convert electrical resistivity data to thermal conductivity data, is probed: Here, whether the constant of proportionality, the Lorenz number, is constant at extreme conditions is of vital importance. Electron-electron inelastic scattering and increases in Fermi-liquid-like behavior may cause uncertainties in thermal conductivities derived from both first-principles-associated calculations and electrical conductivity measurements. Additional uncertainties include the role of alloying constituents and local magnetic moments of iron in modulating the thermal conductivity. Thus, uncertainties in thermal conductivity remain pervasive, and hence a broad range of core heat flows and inner core ages appear to remain plausible.

Does U–Pb date Earth's core formation?

Nature ◽  
2006 ◽  
Vol 444 (7115) ◽  
pp. E1-E1 ◽  
Author(s):  
Qing-zhu Yin ◽  
Stein B. Jacobsen
Keyword(s):  
Core Formation ◽  
Earth’S Core ◽  
Earth's Core

Numerical simulation of Earth's core formation

1993 ◽  
Vol 98 (B2) ◽  
pp. 2075-2089 ◽  
Author(s):  
Rie Honda ◽  
Hitoshi Mizutani ◽  
Tetsuo Yamamoto
Keyword(s):  
Numerical Simulation ◽  
Core Formation ◽  
Earth’S Core ◽  
Earth's Core

The Earth's core formation due to the Rayleigh-Taylor instability

Icarus ◽  
1987 ◽  
Vol 69 (2) ◽  
pp. 239-248 ◽  
Author(s):  
Shigeru Ida ◽  
Yoshitsugu Nakagawa ◽  
Kiyoshi Nakazawa
Keyword(s):  
Taylor Instability ◽  
Core Formation ◽  
Earth’S Core ◽  
Earth's Core ◽  
Rayleigh Taylor Instability
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