Other
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74...27e&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 74, no. 1, June 1985, p. 27-34. SNSF-supported research.
Other
6
Abundance, Isotopes, Noble Metals, Planetary Craters, Rare Gases, Sediments, Chondrites, Denmark, Meteorites
Scientific paper
Noble gases in four sediment samples from the Cretaceous-Tertiary boundary collected near Stevns in Denmark were investigated to test the possibility of the presence of noble gases indicative for meteorites. All samples were also analyzed for the noble metals Os and Ir and twelve other elements. The observed enrichments of He-3, He-4 and of Ar, Kr, and Xe relative to atmospheric abundances can be explained without invoking the addition of extraterrestrial material. The Ne-20/Ne-22 ratio and the Kr and Xe isotopic compositions are identical with the isotopic ratios in the terrestrial atmosphere. In contrast, the high noble metal concentrations indicate the presence of material with elemental abundances similar to chondritic matter. Compared to noble metals the noble gases are less sensitive tracers of an admixture of extraterrestrial matter in sediments.
Eugster Otto
Geiss Johannes
Kraehenbuehl Urs
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