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40Ar-39Ar dating of the Manson impact structure: A cretaceous-tertiary boundary crater candidate

Science

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Abstract

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 ?? 1.0 million years ago, an age that is indistinguishable from that of the K-T boundary, within the limits of analytical precision.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
40Ar-39Ar dating of the Manson impact structure: A cretaceous-tertiary boundary crater candidate
Series title:
Science
Volume
244
Issue:
4912
Year Published:
1989
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1565
Last page:
1568
Number of Pages:
4