Physics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...236..705b&link_type=abstract
Science (ISSN 0036-8075), vol. 236, May 8, 1987, p. 705-709.
Physics
61
Clays, Hypervelocity Impact, Planetary Evolution, Quartz, Shock Loads, Spatial Distribution, Crystallography, Geology, Grain Boundaries, Solid-Solid Interfaces, X Ray Diffraction
Scientific paper
Shocked quartz grains displaying planar features were isolated from Cretaceous-Tertiary boundary clays at five sites in Europe, a core from the north-central Pacific Ocean, and a site in New Zealand. At all of these sites, the planar features in the shocked quartz can be indexed to rational crystallographic planes of the quartz lattice. The grains displaying streaking indicative of shock in X-ray diffraction photographs and also show reduced refractive indices. These characteristic features of shocked quartz at several sites worldwide confirm that an impact event at the Cretaceous-Tertiary boundary distributed ejecta products in an earth-girdling dust cloud, as postulated by the Alvarez impact hypothesis.
Bohor Bruce F.
Foord Eugene E.
Modreski Peter J.
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