Iridium anomaly at the Cretaceous-Tertiary boundary in Texas

Details Iridium anomaly at the Cretaceous-Tertiary boundary in Texas Iridium anomaly at the Cretaceous-Tertiary boundary in Texas

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..54..393g&link_type=abstract

Earth and Planetary Science Letters, vol. 54, no. 3, Aug. 1981, p. 393-396.

Astronomy and Astrophysics

Astrophysics

18

Geochemistry, Iridium, Paleontology, Sediments, Anomalies, Neutron Activation Analysis, Texas

Scientific paper

Nine samples of surface outcrops in Texas, extending from 60 cm below the stratigraphic boundary to 40 cm above it, were analyzed for iridium by neutron activation analysis in order to (1) broaden the data base of the biotic changes at the Cretaceous-Tertiary boundary and (2) characterize these changes more fully in the hemipelagic setting. It is found that iridium concentrations range from a low of 0.032 ppb in the upper Cretaceous marly sediment to 2.10 ppb at the boundary, representing a fifty-fold increase in the iridium content over background values. These results are pertinent to speculations concerning the nature of the terminal Cretaceous catastrophe.

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