Projectile-target mixing in melted ejecta formed during a hypervelocity impact cratering event

Details Projectile-target mixing in melted ejecta formed during a hypervelocity impact cratering event Projectile-target mixing in melted ejecta formed during a hypervelocity impact cratering event

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..457e&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 457-458 (SEE N94-12015 01-91)

Computer Science

Ejecta, Hypervelocity Impact, Meteoritic Composition, Mixing, Projectile Cratering, Targets, Contamination, Cretaceous-Tertiary Boundary, Global Warming, Melting, Mixing Height, Tektites

Scientific paper

Tektites contain little to no projectile contamination while, in contrast, some distal ejecta deposits can be relatively projectile-rich (e.g. the Cretaceous-Tertiary (K-T) boundary clay). This compositional difference motivated an experimental study of hypervelocity target-projectile mixing processes. We hope to scale up the results from these experiments and apply them to terrestrial impact structures like the Chicxulub Crater, Yucutan, Mexico, the leading contender as the site for the impact that caused the mass extinction that marks the K-T boundary. Shock decomposition of the approximately 500m thickness of anhydrite, or greater thickness of limestone, in the target rocks at Chicxulub may have been a critical mechanism for either global cooling via SO3, and subsequently H2SO4, formation, or possibly, global warming via increased CO2 formation. Understanding target-projectile mixing processes during hypervelocity impact may permit more accurate estimates of the amount of potentially toxic, target-derived material reaching stratospheric heights.

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