Clay mineralogy of the Cretaceous-Tertiary boundary clay

Details Clay mineralogy of the Cretaceous-Tertiary boundary clay Clay mineralogy of the Cretaceous-Tertiary boundary clay

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...219..495r&link_type=abstract

Science, vol. 219, Feb. 4, 1983, p. 495-498.

Mathematics

Logic

23

Asteroids, Clays, Ejecta, Geochemistry, Mineralogy, Denmark, Italy, Spain, X Ray Diffraction

Scientific paper

Cretaceous-Tertiary boundary layer clay samples from four localities were subjected to analyses which imply that they are neither mineralogically exotic nor distinct from locally derived clays above and below the boundary. The anomalous iridium-rich ejecta component predicted by the asteroid impact scenario of Alvarez et al (1980) was not detected. It is proposed that volcanic material be considered as an explanation of the geochemical anomalies of the Cretaceous-Tertiary boundary. A model which involves a period of intense volcanism at the end of the Cretaceous would generate a variety of climatic and biological effects consonant with the geologic history of that period.

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