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Impact-shocked zircons: Discovery of shock-induced textures reflecting increasing degrees of shock metamorphismTextural effects specifically characteristic of shock metamorphism in zircons from impact environments have not been reported previously. However, planar deformation features (PDF) due to shock metamorphism are well documented in quartz and other mineral grains from these same environments. An etching technique was developed that allows scanning electron microscope (SEM) visualization of PDF and other probable shock-induced textural features, such as granular (polycrystalline) texture, in zircons from a variety of impact shock environments. These textural features in shocked zircons from K/T boundary distal ejecta form a series related to increasing degrees of shock that should correlate with proportionate resetting of the U-Pb isotopic system.
Document ID
19950038162
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bohor, B. F.
(U.S. Geological Survey, Denver, CO United States)
Betterton, W. J.
(U.S. Geological Survey, Denver, CO United States)
Krogh, T. E.
(Royal Ontario Museum Toronto, Canada)
Date Acquired
August 16, 2013
Publication Date
September 1, 1993
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 119
Issue: 3
ISSN: 0012-821X
Subject Category
Geophysics
Accession Number
95A69761
Funding Number(s)
CONTRACT_GRANT: NASA ORDER T-5715
Distribution Limits
Public
Copyright
Other

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