Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.359..819s&link_type=abstract
Nature (ISSN 0028-0836), vol. 359, no. 6398, p. 819-821.
Physics
104
Craters, Cretaceous-Tertiary Boundary, Impact Damage, Abundance, Grain Boundaries, Magnetic Properties, Quartz Crystals
Scientific paper
Evidence from core samples is presented that Chicxulub is a K/T source crater and can apparently account for all the evidence of impact distributed globally at the K/T boundary without the need for simultaneous multiple impact of comet showers. Shocked breccia clasts found in the cores are similar to shocked lithic fragments found worldwide in the K/T boundary ejecta layer. The Chicxulub melt rocks contain anomalously high levels of iridium, also consistent with the iridium-enriched K/T boundary layer. The best estimate of the crystallization age of these melt rocks, as determined by Ar-40/Ar-39 analyses, is 65.2 +/- 0.4 Myr. These melt rocks acquired a remanent magnetization indicating that they cooled during a period of reversed geomagnetic polarity. The only such episode consistent with Ar-40/Ar-39 constraints is chron 29R, which includes the K/T boundary.
Brent Dalrymple G.
Marin Luis E.
Ryder Graham
Schuraytz Benjamin C.
Sharpton Virgil L.
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