High noble metal concentrations in a late Pliocene sediment

Details High noble metal concentrations in a late Pliocene sediment High noble metal concentrations in a late Pliocene sediment

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..417k&link_type=abstract

Nature, Volume 292, Issue 5822, pp. 417-420 (1981).

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24

Scientific paper

A 2.3-Myr-old layer in a sediment from the Antarctic Ocean contains Ir and Au at levels comparable with those at the Cretaceous-Tertiary boundary. A sizable fraction of the noble metals is contained in vesicular, millimetre-sized poly-mineralic grains that closely resemble ablation debris from chondritic meteorites, and there is little doubt that the noble metals resulted from the accretion of a large extraterrestrial object. No massive extinctions or other evidence of environmental stress seem to be associated with this accretionary event.

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