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Seawater Strontium Isotopes, Acid Rain, and the Cretaceous-Tertiary Boundary
J. D. Macdougall
New Series, Vol. 239, No. 4839 (Jan. 29, 1988), pp. 485-487
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/1700277
Page Count: 3
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A large bolide impact at the end of the Cretaceous would have produced significant amounts of nitrogen oxides by shock heating of the atmosphere. The resulting acid precipitation would have increased continental weathering greatly and could be an explanation for the observed high ratio of strontium-87 to strontium-86 in seawater at about this time, due to the dissolution of large amounts of strontium from the continental crust. Spikes to high values in the seawater strontium isotope record at other times may reflect similar episodes.
Science © 1988 American Association for the Advancement of Science