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Shocked quartz in the cretaceous-tertiary boundary clays: Evidence for a global distribution

Science

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Abstract

Shocked quartz grains displaying planar features were isolated from Cretaceous-Tertiary boundary days 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 display 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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Shocked quartz in the cretaceous-tertiary boundary clays: Evidence for a global distribution
Series title:
Science
Volume
236
Issue:
4802
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
705
Last page:
709
Number of Pages:
5