New iridium determinations from mexican K/T boundary localities

Details New iridium determinations from mexican K/T boundary localities New iridium determinations from mexican K/T boundary localities

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmos22c0292m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #OS22C-0292

Other

1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 5420 Impact Phenomena (Includes Cratering), 6022 Impact Phenomena, 6205 Asteroids And Meteoroids, 6215 Extraterrestrial Materials

Scientific paper

The presence of extraterrestrial material in terrestrial sediments is usually indicated by an enrichment of platinum group elements (PGE) due their concentration in chondrites is about 104-105 times higher than that in the Earth crust. Discovery of anomalously high concentrations of Ir coincident with the K/T boundary, in several stratigraphic sequences worldwide support the hypothesis that a large asteroid ~10 km in diameter impacted the Earth, and it was the source of the Ir. Several studies about Ir concentration in Chicxulub samples and other K/T section in Mexico had been performed. Here we report on the results from samples taken from three Mexican K/T boundary sections, identified as K/T ejecta sites: La Ceiba, Bochil and Guayal. For La Ceiba we found values until 2.82 ppb.

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