Other
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..92..317k&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 92, no. 3-4, April 1989, p. 317-322.
Other
9
Cretaceous-Tertiary Boundary, Geochemistry, Ice Environments, Iridium, Volcanoes, Antarctic Regions, Chemical Composition
Scientific paper
The analysis of samples of volcanic ash dust layers from the Lewis Cliff/Beardmore Glacier in Antarctica shows that some of the samples contain Ir concentrations up to 7.5 ppb. It is shown that the Ir is positively correlated with Se, As, Sb, and other volcanogenic elements. The results show that Ir may be present in some volcanic ash deposits, suggesting that the Ir in the K/T boundary clays is not necessarily of cosmic origin, but may have originated from mantle reservoirs tapped during extensive volcanic eruptions possibly triggered by impact events.
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