Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..361v&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 361 (SEE N92-10728 01-91)
Physics
Geophysics
Geomorphology, High Pressure, Hypervelocity Impact, Jets, Silicates, Spheres, Tektites, Thin Plates, Asteroids, Azimuth, High Speed, Jet Impingement, Planetary Evolution, Projectiles, Time Functions
Scientific paper
The scientific consensus is that tektites were produced by impacts on the Earth, but the exact mechanism by impacts might form tektites is still unclear. The most widely cited mechanism is jetting, which results from the extremely high pressures generated at the intersection of two bodies whose surfaces converge obliquely at high speed. Theory of jetting for thin plates is extended to the case of the impact of the sphere onto a half-space. The calculations are done for the impact of a silicate sphere onto a silicate target for impact speeds of 15, 20, and 25 km/sec, spanning the range of reasonable impact speeds for asteroids. The angle of impact is varied from 0 to 75 deg. The mass jetted, the jet velocity, projectile fraction in the jet, azimuthal distribution of the jet, and the phase of the jetted material are calculated as functions of time. The total mass jetted and the overall mass-averages of jet velocity, etc. are also calculated.
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