Physics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...234..346o&link_type=abstract
Science (ISSN 0036-8075), vol. 234, Oct. 17, 1986, p. 346-349. Previously announced in STAR as N86-21479.
Physics
47
Hypervelocity Flow, Hypervelocity Impact, Meteorite Collisions, Projectile Cratering, Stony Meteorites, Finite Difference Theory, Mars Surface, Meteorite Craters, Shock Waves, Silicates
Scientific paper
Cratering flow calculations for a series of oblique to normal impacts of silicate projectiles onto a silicate halfspace were carried out to determine whether the gas produced upon shock vaporizing both projectile and planetary material could entrain and accelerate surface rocks and thus provide a mechanism for propelling SNC meteorites from the Martian surface. The difficult constraints that the impact origin hypothesis for SNC meteorities has to satisfy are that these meteorites are lightly to moderately shocked and yet were accelerated to speeds in excess of the Martian escape velocity. Two dimensional finite difference calculations demonstrate that at highly probable impact velocities, vapor plume jets are produced at oblique impact angles of 25 deg to 60 deg and have speeds as great as 20 km/sec. These plumes flow nearly parallel to the planetary surface. It is shown that upon impact of projectiles having radii of 0.1 to 1 km, the resulting vapor jets have densities of 0.1 to 1 g/cu cm. These jets can entrain Martian surface rocks and accelerate them to velocities 5 km/sec. It is suggested that this mechanism launches SNC meteorites to earth.
Ahrens Thomas J.
Okeefe John D.
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