Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.298..123o&link_type=abstract
Nature, vol. 298, July 8, 1982, p. 123-127.
Physics
13
Bolides, Ejecta, Extraterrestrial Matter, Impact Damage, Meteorite Collisions, Atmospheric Diffusion, Oceans, Planetary Boundary Layer
Scientific paper
An examination of the mechanics of asteroidal, cometary, and meteor swarm impact on the earth determined if the enrichment of projectile material in the K-T layer is consistent with melts and impact breccias on the earth and moon, the size of the impacters, the distribution of the kinetic energy, and the sequence of impacts that could give rise to observed extinction phenomena. Flows resulting from spherical projectile impacts onto layers of air, water, and silicates were modeled and Eulerian finite difference algorithms were employed to solve conservation equations and equations of state. A range of speeds and impacter densities were considered, along with sizes from 0.17 km, which would be consumed in the atmosphere, to a 10 km object, which would have had a diameter greater than a reference 7.1 km atmosphere depth. It is concluded that an impact of the K-T bolide could result in global biotic extinction and worldwide material deposition.
Ahrens Thomas J.
Okeefe John D.
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