Impact-shocked zircons: Discovery of shock-induced textures reflecting increasing degrees of shock metamorphism

Details Impact-shocked zircons: Discovery of shock-induced textures reflecting increasing degrees of shock metamorphism Impact-shocked zircons: Discovery of shock-induced textures reflecting increasing degrees of shock metamorphism

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.119..419b&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 119, no. 3, p. 419-424

Physics

Geophysics

34

Crystals, Deformation, Geophysics, Lead Isotopes, Planetary Evolution, Polymorphism, Shock Loads, Uranium Isotopes, Crystal Defects, Crystal Structure, Etching, Grain Size, Microstructure, Textures

Scientific paper

Textural 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.

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