Planar lamellar substructures in quartz

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doi: 10.1016/0012-821X(93)90151-X
Authors:Lyons, John B.; Officer, Charles B.; Borella, Peter E.; Lahodynsky, Roman
Author Affiliations:Primary:
Dartmouth College, Earth Sciences Department, Hanover, NH, United States
Saddleback College, Mission Viejo, CA, United States
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 119(3), p.431-440. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1993
Note:In English. 26 refs.; illus. incl. 1 table
Summary: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.
Subjects:Cambrian; Clastic rocks; Crystal structure; Crystallography; Experimental studies; Framework silicates; Lamellae; Metamorphism; Orientation; Orthoquartzite; Paleozoic; Quartz; Sedimentary rocks; Shock metamorphism; Silica minerals; Silicates; Strain; Tapeats Sandstone; TEM data; Asia; Australasia; Australia; California; Canada; Europe; Far East; Finland; Indonesia; Scandinavia; United States; Western Europe; Dry Creek Ridge; Koefels Australia; Papoose Flat Pluton; Toba Volcanics
Abstract Numbers:94M/3497
Record ID:1994015494
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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