Effect of an impact-generated gas cloud on the acceleration of solid ejecta

Details Effect of an impact-generated gas cloud on the acceleration of solid ejecta Effect of an impact-generated gas cloud on the acceleration of solid ejecta

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9114139v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 10, 1986, p. 14139-14160.

Physics

26

Acceleration, Ejecta, Escape Velocity, Mars Environment, Meteorites, Projectile Cratering, Cosmic Rays, Craters, Ejection, Entrainment, Interplanetary Flight

Scientific paper

A hypothesis that vaporization of a large amount of volatiles such as H2O and CO2 in the Martian surface by the impact of a large object could have accelerated solid ejecta to earth is examined. A hydrodynamic model is used to approximate a hemispherical gas cloud expanding into an atmosphere and entraining solid ejecta. Account is taken of the target material, the impactor materials, mass vaporized, impact velocity, drag coefficient, and crater sizes. A Martian crater larger than 30 km diam is found to be a necessary remnant of any impact that could have produced the shergottites, nakhlites and Chassigny meteorites which have been found on earth and possess similarities to analyzed Martian rocks.

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