Other
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..356d&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 64, no. 3, Sept. 1983, p. 356-373.
Other
48
Abundance, Ejecta, Geochemistry, Isotopes, Meteorites, Sediments, Trace Elements, Chemical Composition, Clays, Extraterrestrial Matter, Ocean Bottom, Spain, Cretaceous-Tertiary Event, Isotopes, Sediments, Boundary Layers, Impacts, Rubidium, Strontium, Samarium, Neodymium, Potassium, Calcium, Hydrogen, Oxygen, Isotopic Ratios, Trace Elements, Abundance, Samples, Terrestrial, Carbonate, Procedure, Techniques, Stratigraphy, Clay, Source, Origin, Weathering, Spherules, Concentrations, Crust, Lithosphere, Compar
Scientific paper
The results of isotopic and trace-element-abundance analyses of Ir-enriched Cretaceous-Tertiary-boundary clay sediments from Caravaca, Spain, and of adjacent carbonate and marl layers, are presented. Acetic-acid and HCl leachates and residues were analyzed by isotope dilution to determine K, Rb, Sr, Sm, and Nd concentrations and Sr-87/Sr-86 and Nd-143/Nd-144 ratios. The stable isotope ratios delta-D, delta-(C-13), and delta-(0-18) were also determined. The results are presented in tables and graphs and compared with published data on the Caravaca sediments and on samples from other locations. The boundary clay is found to be distinguished from the adjacent layers by its isotopic ratios and to be of mainly terrestrial, lithospheric (deeper than 3-km) origin. Although submarine-weathering effects are evident and difficult to quantify, the degree of variation in Ni, Ir, Sr, and REE concentrations is considered too large to be attributed to postdepositional processes alone. These findings are seen as evidence for the ocean impact of a large single asteroid producing a worldwide blanket of ejecta, a large injection of water vapor into the atmosphere, and perhaps a gigantic tsunami, at the end of the Cretaceous period.
Depaolo Donald J.
Kyte Frank T.
Marshall Brian D.
O'Neil James R.
Smit Jan
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