Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sci...285...85s&link_type=abstract
Science, Vol. 285, No. 5424, p. 85 - 88
Physics
13
Impact Phenomena: Numerical Simulations, Impact Phenomena: Meteorite Craters, Meteorites: Nickel
Scientific paper
Two main types of material survive from the Canyon Diablo impactor, which produced Meteor Crater in Arizona: iron meteorites, which did not melt during the impact; and spheroids, which did. Ultrasensitive measurements using accelerator mass spectrometry show that the meteorites contain about seven times as much nickel-59 as the spheroids. Lower average nickel-59 contents in the spheroids indicate that they typically came from 0.5 to 1 m deeper in the impactor than did the meteorites. Numerical modeling for an impact velocity of 20 km sec-1 shows that a shell 1.5 to 2 m thick, corresponding to 16% of the projectile volume, remained solid on the rear surface; that most of the projectile melted; and that little, if any, vaporized.
Cresswell Richard G.
di Tada M. L.
Fifield Keith L.
Herzog Gregory F.
Liu Kaijian
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