Mathematics
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..315d&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 315.
Mathematics
1
Meteorite Craters, Hypervelocity Impact, Ejecta, Spatial Distribution, Cretaceous-Tertiary Boundary, Mathematical Models, Computerized Simulation
Scientific paper
The origin of the K/T boundary sequence of impact ejecta of the Chicxulub impact crater has been reexamined by constructing a computer simulation of the launch and deposition of both low- and high-energy ejecta. The distribution of low- and high-energy ejecta following a vertical impact is illustrated based on 20,000 tracer particles. The distribution is also shown for a 25 deg oblique impact from the southeast. Most of the high-energy ejecta stays within 50,000 km of Earth, with several percent reaching 100,000 km or more before reentering the atmosphere. About 25 percent of the material reaccretes within 2 hrs, about 50 percent within 8 hrs, and about 75 percent within about 72 hrs. At least 20-30 percent of the ejected material escapes the Earth. The implications of these findings for the postimpact environment are considered.
Durda Daniel David
Kring David A.
Melosh Henry Jay
Pierazzo Elisabetta
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