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Quartz and feldspar glasses produced by natural and experimental shock.Refractive index, density, and infrared absorption studies of naturally and experimentally shocked-produced glasses formed from quartz, plagioclase, and alkali-feldspar confirm the existence of two main groups of amorphous forms of the framework silicates: solid-state and liquid-state glasses. These were apparently formed as metastable release products of high-pressure-phases above and below the glass transition temperatures. Solid-state glasses exhibit a series of structural states with increasing disorder caused by increasing shock pressures and temperatures. They gradually merge into the structural state of fused minerals similar to that of synthetic glasses quenched from a melt. Shock-fused alkali feldspars can, however, be distinguished from their laboratory-fused counterparts by infrared absorption and by higher density.
Document ID
19720060470
Document Type
Reprint (Version printed in journal)
Authors
Stoeffler, D.
(NASA Ames Research Center Moffett Field, Calif.; Tuebingen, Universitaet, Tuebingen, Germany)
Hornemann, U.
(Arbeitsgruppe fuer ballistische Forschung Weil am Rheim, Germany)
Date Acquired
August 6, 2013
Publication Date
September 30, 1972
Subject Category
Geophysics
Accession Number
72A44136
Distribution Limits
Public
Copyright
Other

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