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Shock metamorphism of deformed quartzThe effect produced by shock loading (to peak pressures of 12 and 24) on deformed synthetic quartz containing a dislocation and abundant bubbles and small inclusions was investigated, and the relationships between preexisting dislocation density shock lamellae in the target material were examined. The resultant material was found to be inhomogeneously deformed and extremely fractured. Results of TEM examinations indicate that no change in dislocation density was caused by shock loading except in regions containing shock lamellae, where the dislocation density was lowered. The shock-induced defects tend to nucleate on and be controlled by preexisting stress concentrators; shock lamellae, glassy veins, and most curviplanar defects form in tension, presumably during release. An extremely mobile silica fluid is formed and injected into fractures during release, which forcibly removes crystalline fragments from vein walls. It is concluded that shock deformation in quartz is dominated by fracture and melting.
Document ID
19890052477
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gratz, Andrew J.
(California Univ. Los Angeles, CA, United States)
Christie, John
(California, University Los Angeles, United States)
Tyburczy, James
(Arizona State University Tempe, United States)
Ahrens, Thomas
(California Institute of Technology Pasadena, United States)
Pongratz, Peter
(Wien, Technische Universitaet Vienna, Austria)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Physics and Chemistry of Minerals
Volume: 16
ISSN: 0342-1791
Subject Category
Geophysics
Accession Number
89A39848
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-105
Distribution Limits
Public
Copyright
Other

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