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Title:
Shock melting of the Canyon Diablo impactor: constraints from nickel-59 contents and numerical modeling.
Authors:
Schnabel, C.; Pierazzo, E.; Xue, S.; Herzog, G. F.; Masarik, J.; Cresswell, R. G.; di Tada, M. L.; Liu, K.; Fifield, L. K.
Publication:
Science, Vol. 285, No. 5424, p. 85 - 88
Publication Date:
07/1999
Origin:
ARI
ARI Keywords:
Impact Phenomena: Numerical Simulations, Impact Phenomena: Meteorite Craters, Meteorites: Nickel
DOI:
10.1126/science.285.5424.85
Bibliographic Code:
1999Sci...285...85S

Abstract

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.
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Database: Astronomy
Physics
arXiv e-prints