Iridium anomaly associated with the Australasian tektite-producing impact - Masses of the impactor and of the Australasian tektites

Details Iridium anomaly associated with the Australasian tektite-producing impact - Masses of the impactor and of the Australasian tektites Iridium anomaly associated with the Australasian tektite-producing impact - Masses of the impactor and of the Australasian tektites

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4851s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, p. 4851

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10

Cretaceous-Tertiary Boundary, Iridium Compounds, Tektites, Hypervelocity Impact, Meteoritic Composition, Asia, Australia, Core Sampling

Scientific paper

Recently published studies of Ocean Drilling Project (ODP) cores from near southeast Asia reveal microtektite contents much higher than those in previously studied cores, suggesting that Ir contents might be enhanced in the tektite-bearing horizons. A positive Ir anomaly in ODP core 758B from the Ninetyeast Ridge, eastern Indian Ocean has been determined in this study. The peak Ir concentration of 190 pg/g was around double the continuum level. The net Ir fluence is 1.8 +/- 0.5 ng/sq cm over the depth interval from 10.87 to 11.32 m. The microtektite abundances in these and other deep-sea cores confirm that the fluence of tektitic matter decreases radially outwards from southeast Asia. The trend merges with a roughly estimated mass fluence of around 1.1 g/sq cm inferred from evidence of a melt sheet in northeast Thailand. Integration of the inferred distribution yields a total mass of Australasian tektites of 3.2 x 10 to the 16 g. Assuming a similar fallout distribution for the impactor and a chondritic composition, its mass is calculated to be 1.5 x 10 to the 15 g, about three orders of magnitude smaller than the minimum mass of the impactor responsible for the extinctions at the end of the Cretaceous.

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