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Shock wave properties of anorthosite and gabbro

Boslough, Mark B. and Ahrens, Thomas J. (1985) Shock wave properties of anorthosite and gabbro. Journal of Geophysical Research B, 90 (B9). pp. 7814-7820. ISSN 0148-0227. doi:10.1029/JB090iB09p07814.

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Shock wave experiments have been conducted on San Gabriel anorthosite and San Marcos gabbro to peak stresses between 5 and 11 GPa using a 40-mm-bore propellant gun. Particle velocity wave profiles were measured directly at several points in each target by means of electromagnetic gauges, and Hugoniot states were calculated by determining shock transit times from the gauge records. The particle velocity profiles yielded sound velocities along the release adiabats which indicate a retention of shear strength upon shock compression for anorthosite, with a loss of strength upon release to nearly zero stress. Sound velocities of anorthosite shocked to peak stresses between 6 and 10 GPa were measured to be between 5.1 and 5.3 km/s upon release to nearly zero stress as compared to ∼6.9 and 5.4 km/s for the expected longitudinal and bulk wave speeds. Stress density release paths in the anorthosite indicate possible transformation of albite to Jadeite + (quartz or coesite), with the amount of albite transformed ranging from as low as 0.05 to as much as 0.19 mass fraction in the 6–10 GPa shock stress range. Electrical interference effects precluded the determination of accurate release paths for San Marcos gabbro. Because of the apparent loss of shear strength during unloading from the shocked state, the fluidlike rheology of anorthosite which is indicated implies that calculations of energy partitioning due to impact onto planetary surfaces based on elastic-plastic models will underestimate the amount of internal energy deposited in the impacted surface material.

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Additional Information:Copyright 1985 by the American Geophysical Union. (Received February 29, 1984; revised February 12, 1985; accepted March 11, 1985.) Paper number 4B5000. We appreciate the assistance of E. Gelle, W. Ginn, J. Long, and M. Long in building and carrying out experiments. We thank R. Heuser, R. Hill, and S. Rigden for analyzing rock samples and S. Sondergaard for help in fabricating gauges. We are grateful to O. Anderson and D. Grady for their helpful comments. This work was supported under NASA grant NGL 05-002-105. Contribution 4013, Division of Geological and Planetary Sciences, Pasadena, California 91125
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NASANGL 05-002-105
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Caltech Division of Geological and Planetary Sciences4013
Issue or Number:B9
Record Number:CaltechAUTHORS:20141030-122404790
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Official Citation:Boslough, M. B., and T. J. Ahrens (1985), Shock wave properties of anorthosite and gabbro, J. Geophys. Res., 90(B9), 7814–7820, doi:10.1029/JB090iB09p07814.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51073
Deposited By: George Porter
Deposited On:30 Oct 2014 20:16
Last Modified:10 Nov 2021 19:05

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