Experimentally induced 'natural' intragranular flow in quartz and quartzite

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ID: 292922
1968
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Abstract
Quartz crystals and quartzite deformed dry in a new apparatus at 6 to 10 kb confining pressure, 500 degrees to 1020 degrees C, and at strain rates of 10 (super -5) to 10 (super -7) per sec, show permanent strains of 1 percent to \>10 percent by intragranular slip and/or minor recrystallization. An increase of 50 degrees to 100 degrees C decreases strength similarly to a tenfold decrease in strain rate in both materials. Quartz deformation lamellae have been produced on single crystals and in an orthoquartzite with random crystallographic orientation. All deformation mechanisms depend upon confining pressure, temperature, stress difference, and strain rate. These experimental results firmly establish three methods for determining principal stress directions in quartz-bearing tectonites.
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Authors H. C. Heard, N. L. Carter
Journal american journal of science
Year 1968
DOI
10.2475/ajs.266.1.1
URL
https://ajs.scholasticahq.com/article/59218.pdf
Keywords Keywords not found

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