NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Seawater strontium isotopes, acid rain, and the Cretaceous-Tertiary boundaryA 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.
Document ID
19880038520
Document Type
Reprint (Version printed in journal)
Authors
Macdougall, J. D. (California, University Scripps Institution of Oceanography, La Jolla, United States)
Date Acquired
August 13, 2013
Publication Date
January 29, 1988
Publication Information
Publication: Science
Volume: 239
ISSN: 0036-8075
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other