Platinum-group Elements and Silver in the Cretaceous-Tertiary Boundary Samples from Stevns Klint, Denmark
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概要
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Ru, Pd, Ir, Pt and Ag in two Cretaceous-Tertiary boundary Danish samples and in the Orgueil carbonaceous chondrite were determined by isotope dilution employing the inductively coupled-plasma mass spectrometer. Some mutual abundance fractionation potentially reflecting the difference in metal density can be recognized among the platinum-group elements (PGE). Silver is anomalously enriched by a factor of 15 compared with PGE, on the basis of “cosmic” abundances. This enrichment of Ag can be interpreted as indicating the precipitation of silver sulfide from seawater. Sulfate reduction to sulfide anion in seawater is suggested as an explanation of anomalous enrichment of Ag and Re.
著者
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Masuda Akimasa
Department Of Chemistry Faculty Of Science The University Of Tokyo
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Aikawa Masahide
Department Of Applied Chemistry School Of Engineering Nagoya University
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GANAPATHY R.
Mallinckrodt Baker Inc.
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MASUDA Akimasa
Department of Chemistry, University of Electro-Communications
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VIN YI
Department of Chemistry, University of Electro-Communications
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