Physics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9.1267d&link_type=abstract
Geophysical Research Letters, vol. 9, Nov. 1982, p. 1267-1270.
Physics
20
Mechanical Properties, Planetary Cores, Planetary Evolution, Planetology, Ice, Iron, Rocks, Stress Analysis, Planets, Cores, Formation, Silicates, Interiors, Pressure, Icy Bodies, Strength, Stress, Density, Heterogeneity, Temperature, Segregation, Impacts, Heating, Thermal Effects, Melting, Radii, Protoplanets, Ice, Accretion
Scientific paper
The ultimate strength of silicates, such as found in the earth's mantle, are examined as a clue to the time that the core of the planet formed. Previous studies are cited of the silicate strength 1-2 GPa, while ice displays a 0.1 GPa, and the confining pressures in planetary interiors cannot increase these strengths by more than a factor of two. Deviatoric stresses are calculated for regions near the bottom of some heterogeneity at a certain distance from the center of the planet. The minimum size of a heterogeneity necessary to break through the mantle and sink toward the core is found to be a few tens of kilometers. These conditions are argued to have been possibly met when the earth was only 1.5% of the current total mass. Iron melting is concluded to be necessary for the core segregation to begin, and protoplanetary interiors are noted to offer little resistance to the flow of iron blobs.
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