Vertical Variation of Rhenium, Cadmium, Silver and Platinum-group Elements within a Transitional Bed of Danish Cretaceous-Tertiary Boundary Layer
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概要
- 論文の詳細を見る
Contents of Re, Cd, Ag and platinum-group elements in specimens from four sub-zones of a 3cm-thick bed of a K-T boundary layer from Stevns Klint in Denmark, were determined by stable isotope dilution using ICP mass spectrometer. The chondrite-normalized Re value linearly decreases in the upper zone. Also the content of Ag linearly diminishes upward. These relations lead us to a conclusion that, at the earliest stage of the formation of this bed, the marine site studied was hi ghlyreducing, and at the final stage of the bed formation, the sea recovered to the “normal” oxidation-reduction potential. That is, it is reasoned that the anomalously reducing condition at the site persisted for a relatively short period. Some discussions are given to effect of chemical valency state on distributional features and to fractionation in the dust fallout.
- 日本学士院の論文
著者
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Masuda Akimasa
Department of Chemistry, Faculty of Science, University of Tokyo
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Masuda Akimasa
Department Of Chemistry Faculty Of Science The University Of Tokyo
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SHIOKAWA Takahiro
Department of Chemistry, University of Electro-Communications
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SAHOO Yu
Department of Chemistry, University of Electro-Communications
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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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SHIOKAWA Takahiro
Department of Chemistry, The University of Electro-Communications
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