Chalcophile elements and IR in continental Cretaceous-Tertiary boundary clays from the western interior of the USA

Details Chalcophile elements and IR in continental Cretaceous-Tertiary boundary clays from the western interior of the USA Chalcophile elements and IR in continental Cretaceous-Tertiary boundary clays from the western interior of the USA

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1695s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, April 1992, p. 1695-1703. Research supported by NFR and Erna and Vict

Other

7

Clays, Cretaceous-Tertiary Boundary, Iridium, Sea Water, Antimony Compounds, Arsenic Compounds, Precipitation (Chemistry), United States, Zinc Compounds

Scientific paper

Data are presented for Ir and the chalcophile elements As, Sb, and Zn in 17 samples from continental K/T boundary layers in the western interior of the U.S. The results show that, in contrast to previously studied marine boundary clays, the continental boundary layers exhibit no correlation between Ir and any of the chalcophile elements. Compared with average shale, the continental boundary layers are significantly to strongly enriched in Ir, As, and Sb, but show ordinary Zn concentrations. The Ir enrichments are attributed to fallout of extraterrestrial matter, whereas As and Sb enrichments are readily explained by the close spatial association of the boundary layers with coal and the abundance in the layers of jarosite, goethite, and other weathering products of pyrite. The correlation between chalcophile elements and Ir in marine boundary clays, and the absence of such a correlation in continental boundary clays concurs with the idea that a major fraction of the Ir in extremely Ir-rich marine boundary clays has precipitated from seawater that was enriched in Ir being derived from a vaporized asteroid.

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