Mathematics – Logic
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32...40s&link_type=abstract
Earth and Planetary Science Letters, vol. 32, no. 1, Sept. 1976, p. 40-44.
Mathematics
Logic
3
Fragmentation, Impact Damage, Limestone, Meteoritic Damage, Gas Guns, Meteorite Collisions, Petrology, Spallation
Scientific paper
Results are reported for impact experiments that were performed to study formation conditions for shatter cones (rock structures produced under high-shock compression). In the experiments, impact craters were produced in irregularly shaped limestone targets by spherical metal projectiles fired from a light-gas gun, and millimeter-size shatter cones were detected within crater spallation zones and central depressions. It is found that shatter-cone formation began at impact velocities of about 3 km/s, corresponding to a peak pressure of 300 to 400 kbar. Since impacts of extraterrestrial bodies are considered to be the only possible natural source of such high pressures, it is concluded that the present results strongly support the opinion that shatter cones are useful criteria for deducing astroblemes from geologic evidence. It is noted that the occurrence of shatter cones in spallation zones is not in accord with Gash's (1971) theoretical model for shatter-cone formation.
Schneider Edward
Wagner Günther A.
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