Emplacement of Cretaceous-Tertiary Boundary Shocked Quartz from Chicxulub Crater

Details Emplacement of Cretaceous-Tertiary Boundary Shocked Quartz from Chicxulub Crater Emplacement of Cretaceous-Tertiary Boundary Shocked Quartz from Chicxulub Crater

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sci...269..930a&link_type=abstract

Science, Volume 269, Issue 5226, pp. 930-935

Computer Science

44

Scientific paper

Observations on shocked quartz in Cretaceous-Tertiary (K-T) boundary sediments compellingly tied to Chicxulub crater raise three problems. First, in North America shocked quartz occurs above the main K-T ejecta layer. Second, shocked quartz is more abundant west than east of Chicxulub. Third, shocked quartz reached distances requiring initial velocities up to 8 kilometers per second, corresponding to shock pressures that would produce melt, not the moderate-pressure shock lamellae observed. Shock devolatilization and the expansion of carbon dioxide and water from impacted wet carbonate, producing a warm, accelerating fireball after the initial hot fireball of silicate vapor, may explain all three problems.

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