Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.2955e&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, no. 7, July 1992, p. 2955-2961.
Computer Science
1
Basalt, Cretaceous-Tertiary Boundary, Iridium Compounds, Noble Metals, Geochemistry, North Sea, Quartz
Scientific paper
The contents of Ir, Pt, Au, and Ag of basaltic tuffs and enclosing black shales of the Balder Formation (North Sea) were analyzed to test the contention that basaltic volcanism has contributed markedly to the Ir flux at the Cretaceous/Tertiary (K/T) boundary. Results showed that the tuffs and the shales both contain concentrations of Ir (0.1-0.25) which are, on a per-weight basis, higher than the Ir levels recently measured from terrestrial rocks including the Deccan Trap and the Columbia River flood basalts, but are comparable to Hawaiian and Reunion Island basalts. The relevance of these results to the hypothesis of the flood-volcanism origin (versus the meteorite-impact origin) of the Ir anomaly in the Balder Formation is discussed.
Aronson James L.
Crawford Elliott W.
Millard Hugh T. Jr.
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