Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.119..431l&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 119, no. 3, p. 431-440
Physics
12
Crystal Defects, Crystals, Deformation, Earth (Planet), Geology, Planar Structures, Quartz, Crystal Structure, Crystallography, Grain Size, Microstructure, Transmission Electron Microscopy
Scientific paper
Both single and multiple sets of lamellar features in quartz grains can be produced in shock experiments and are observed at known impact sites; they can also be produced in static, constant strain-rate experiments and are observed at known tectonic and explosive volcanic sites. The former are strictly planar and parallel and generally conform to rational crystallographic orientations in the quartz crystal structure. The latter can also be planar and parallel but sometimes show slight to moderate curvature with lamellar bifurcations and variable lamellar widths. Their orientations show a variety of forms with, in general, a broader angular distribution than that of the impact-generated lamellae. Deductions of physical conditions of deformation from optical morphology, spacing, multiplicity and orientation information alone remain somewhat conjectural; full characterization by transmission electron microscopy (TEM) appears to be necessary.
Borella Peter E.
Lahodynsky Roman
Lyons John B.
Officer Charles B.
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