Iridium Metal in Chicxulub Impact Melt: Forensic Chemistry on the K-T Smoking Gun

Details Iridium Metal in Chicxulub Impact Melt: Forensic Chemistry on the K-T Smoking Gun Iridium Metal in Chicxulub Impact Melt: Forensic Chemistry on the K-T Smoking Gun

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...271.1573s&link_type=abstract

Science, Volume 271, Issue 5255, pp. 1573-1576

Computer Science

10

Scientific paper

Iridium concentrations in successively smaller subsplits of melt rock and melt breccia from the Chicxulub impact basin were tracked to isolate and identify iridium carrier phases. Iridium-rich particles were isolated from two samples, and a micrometer-scale, silicate-enclosed aggregate of subhedral iridium metal grains was identified in one, confirming earlier reports of iridium at ground zero of the impact at the Cretaceous-Tertiary (K-T) boundary. The aggregate may be either a phase formed after the collision or a relict of the Chicxulub basin-forming meteorite. In either case, its presence indicates that even among the largest impact structures on Earth, meteoritic components may be preserved within the crater.

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