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Effects of shock pressures on calcic plagioclaseCalcic plagioclase single crystals were subjected to shock loading up to a pressure of 496 kbar; optical and electron microscope studies were conducted to investigate the shock-induced effects on the mineral, which is found in terrestrial and lunar rocks and in meteorites. It was observed that up to 287 kbar pressure, the recovered samples are essentially crystalline, while samples subjected to pressures between 300 and 400 kbar are almost 100% diaplectic glasses, suggesting shock transformation in the solid state. Samples shock-loaded to pressures greater than 400 kbar yielded glasses with refractive indices similar to those of thermally fused glass. It is concluded that planar features, absent in all the specimens, may not be definitive shock indicators, but may be linked to local heterogeneous dynamic stresses experienced by plagioclase grains within shocked rocks.
Document ID
19770068506
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gibbons, R. V.
(California Inst. of Tech. Pasadena, CA, United States)
Ahrens, T. J.
(California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Publication Information
Publication: Physics and Chemistry of Minerals
Volume: 1
Subject Category
Earth Resources And Remote Sensing
Accession Number
77A51358
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-105
Distribution Limits
Public
Copyright
Other

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