Computer Science
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982geokh......946b&link_type=abstract
Geokhimiia, July 1982, p. 946-959. In Russian.
Computer Science
Hypervelocity Impact, Meteorite Craters, Planetary Evolution, Planetary Geology, Planetary Surfaces, Projectile Cratering, Crystal Lattices, Evaporation, Fragmentation, Impact Loads, Impact Melts, Meteoritic Damage, Planetary Gravitation, Shock Loads
Scientific paper
A short description is given of meteoritic impacts and of the transformations wrought in the target rocks. Approximate formulas are presented for the depedence of the peak pressure in the shock wave on the energy of the impact and the distance from the point of impact and for the dependence of the diameter of the impact crater on the energy of impact and the magnitude of the gravitational force on the planetary body. The type of transformation occuring during impact is shown to depend on the pressure in the shock wave. For ordinary rock-forming minerals, fragmentation is typical when the pressure exceeds several kb. At 100-400 kb there is damage to the crystal lattice and transition to a high-pressure phase. Pressures of 400-800 kb cause melting, and those exceeding 1 megabar cause evaporation. The impact heating of the meteorite and target rock brings about a mobilization of volatile components.
Bazilevskii Aleksandr T.
Feldman V. I.
Florenskii K. P.
Granovskii L. B.
Iakovlev O. I.
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