Physics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...244.1565k&link_type=abstract
Science (ISSN 0036-8075), vol. 244, June 30, 1989, p. 1565-1568.
Physics
26
Argon Isotopes, Bolides, Cretaceous-Tertiary Boundary, Meteorite Craters, Mineralogy, Geochemistry, Meteoritic Damage, Spectrum Analysis, Structural Properties (Geology)
Scientific paper
The mineralogy of shocked mineral and lithic grains in the Cretaceous-Tertiary (K-T) boundary claystone worldwide is most consistent with a bolide impact on a continent. Both the concentrations and sizes of these shocked grains are greatest in the western interior of North America. These data suggest that the Manson impact structure in north-central Iowa is a viable candidate for the K-T boundary impact event. Argon-40-argon-39 age spectrum dating of shocked microcline from the crystalline central uplift of the Manson impact structure indicates that there was severe argon-40 loss at 65.7 + or - 1.0 million years ago, an age that is indistinguishable from that of the K-T boundary, within the limits of analytical precision.
Haugerud R. A.
Izett Glen A.
Kunk Michael J.
Sutter John F.
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