Computer Science
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.2361s&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, Nov. 1985, p. 2361-2370. Research supported by the Naturvetenskapliga
Computer Science
13
Clays, Geochemistry, Iridium, Metals, Precipitation (Chemistry), Stratigraphy, Abundance, Asteroids, Denmark, Impact, Pyrites, Spheroids
Scientific paper
The theory that enrichment of the Fish Clay in Denmark occurs by the precipitation of metals at a geochemical barrier is proposed. The compositions of the layers of the Fish Clay are described, and a table of the elemental concentrations in the Fish Clay is provided. Data supporting the precipitation of elements as sulfides at the redoxcline include: (1) the chalcophile element abundance pattern in the Fish Clay; (2) the precipitation of metals at the anoxic-oxic boundary; and (3) the large amount of small pyrite spheroids at the redoxcline. A precipitation model depicting the process of elemental enrichment in the Fish Clay, based on metal-bearing pore solutions losing their metals by precipitation upon passing the boundary between the oxic Cretaceous chalk and the overlying anoxic and hydrogen sulfide-rich Fish Clay, is examined.
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