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Shock compression of a recrystallized anorthositic rock from Apollo 15Hugoniot measurements on 15,418, a recrystallized and brecciated gabbroic anorthosite, yield a value of the Hugoniot elastic limit (HEL) varying from 45 to 70 kbar as the final shock pressure is varied from 70 to 280 kbar. Above the HEL and to 150 kbar, the pressure-density Hugoniot is closely described by a hydrostatic equation of state constructed from ultrasonic data for single-crystal plagioclase and pyroxene. Above 150 kbar, the Hugoniot states indicate that a series of one or more shock-induced phase changes are occurring in the plagioclase and pyroxene. From Hugoniot data for both the single-crystal minerals and the Frederick diabase, we infer that the shock-induced high-pressure phases in 15,418 probably consists of a 3.71 g/cu cm density, high-pressure structure for plagioclase and a 4.70 g/cu cm perovskite-type structure for pyroxene.
Document ID
19740040232
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Ahrens, T. J.
Gibbons, R. V.
(California Institute of Technology Pasadena, Calif., United States)
O'Keefe, J. D.
(California, University Los Angeles, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Subject Category
Space Sciences
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 5, 1973
End Date: March 8, 1973
Accession Number
74A22982
Funding Number(s)
CONTRACT_GRANT: NGL-05-005-105
CONTRACT_GRANT: NGL-05-007-002
Distribution Limits
Public
Copyright
Other

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