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Shock compression of crustal rocks: Data for quartz, calcite, and plagioclase rocks

Ahrens, Thomas J. and Gregson, V. G., Jr. (1964) Shock compression of crustal rocks: Data for quartz, calcite, and plagioclase rocks. Journal of Geophysical Research, 69 (22). pp. 4839-4874. ISSN 0148-0227. doi:10.1029/JZ069i022p04839.

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Hugoniot data in the 4- to 250-kb stress range were obtained for quartzite and novaculite, sandstones of varying porosity, single-crystal calcite, marble, porous and nonporous limestone, several plagioclases of varying composition, and a basalt. Conventional plane-wave, in-contact explosive assemblies were used; the shock state was computed from measured shock velocities; particle velocities are inferred from either specimen or driver plate free-surface motion. Impedence-match solutions were obtained for porous rock. High values of the Hugoniot elastic limit were observed in nonporous rocks—approximately 40 to 90 kb in quartzite and novaculite, 40 to 50 kb in the plagioclase rocks, and 15 to 25 kb in calcite and marble. Reduced values were found for porous rocks, approximately 5 kb in sandstone and limestone. Phase transitions are inferred at 30, 45, and 95 kb in calcite, and 22, 45, and 90 kb in marble and limestone. For calcite these are indicated by multiple shock fronts. Anomalously low volumes achieved by sandstone shocked to above approximately 40 kb, and high calculated shock temperatures, suggest partial conversion to coesite or stishovite. High-pressure states observed in basalt and plagioclase agree with previously reported states for gabbro [Hughes and McQueen, 1958] above 300 kb when both data are plotted in terms of relative volume. The previously observed slope-change of the gabbro Hugoniot is believed to result from an elastic wave of perhaps 50-kb amplitude which is overdriven at 300 kb.

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Additional Information:Copyright 1964 by the American Geophysical Union. (Manuscript received June 8, 1964; revised August 26, 1964.) This research was supported through Air Force Cambridge Research Laboratories, contract AF 19(604)-8419, and Defense Atomic Support Agency contract DA-49-146-XZ-277 as part of the Advanced Research Projects Agency's project Vela-Uniform. The program was initiated by Dr. D. R. Grine, who performed much of the early significant work. Mr. C. F. Petersen and Dr. J. C. Jamieson also made important contributions to the study. We are grateful for scientific discussion and guidance provided by Drs. G. R. Fowles and G. E. Duvall and the thoughtful criticisms of the manuscript by Drs. D. G. Doran and P. Moravek. Rock specimens and descriptions provided by H. J. Moore, U.S. Geological Survey, were helpful. We appreciate use of a translation of Stishov's [1963] paper provided by Dr. F. R. Boyd, Carnegie Institution of Washington.
Funding AgencyGrant Number
Air Force Cambridge Research LaboratoriesAF 19(604)-8419
Defense Atomic Support Agency (DASA)DA-49-146-XZ-277
Advanced Research Projects Agency (ARPA), project VelaUNSPECIFIED
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Official Citation:Ahrens, T. J., and V. G. Gregson Jr. (1964), Shock compression of crustal rocks: Data for quartz, calcite, and plagioclase rocks, J. Geophys. Res., 69(22), 4839–4874, doi:10.1029/JZ069i022p04839.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51503
Deposited By: George Porter
Deposited On:10 Nov 2014 19:19
Last Modified:10 Nov 2021 19:11

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