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Shock compression and isentropic release of granite

Sekine, Toshimori and Duffy, Thomas S. and Rubin, Allan M. and Anderson, William W. and Ahrens, Thomas J. (1995) Shock compression and isentropic release of granite. Geophysical Journal International, 120 (2). pp. 247-261. ISSN 0956-540X. doi:10.1111/j.1365-246X.1995.tb01817.x.

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New equation of state data for a weathered granite shocked to about 125 GPa are reported and combined with the Westerly granite data of McQueen, Marsh & Fritz (1967). The shock velocity (U_s)-particle velocity (U_p) relations can be fitted with two linear regressions: U_s= 4.40 + 0.6U_p for a range of U_p up to about 2 km s^(-1) and U_s= 2.66 + 1.49U_p for a range of about 2 to 5 km s^(-1). The third-order Birch-Murnaghan equation of state parameters are K_(os) = 51-57 GPa and K'_(os) = 1.4-1.8 for the low-pressure regime and K_(os) = 251 ± 30 GPa and an assumed K'_(os) = 4 for the high-pressure regime. Compressive waveforms in dry and water-saturated granite were measured at 10-15 GPa using the VISAR technique. The measured wave profiles were successfully modelled using a Maxwellian stress-relaxation material model. Water-saturated granite is characterized by a ~25 per cent lower yield strength and a ~75 per cent longer material relaxation time than dry granite.

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Additional Information:© 1995 Oxford University Press. Accepted 1994 June 7; Received 1993 March 15. We are grateful to Michael Long and Epaprodito Gelle for their assistance in maintaining the guns and preparing samples. The helpful comments proffered by S. Peyton are appreciated. John Beckett helped us to make granite glass for probe analysis. The research was supported under AFGL and Mission Research Corporation Contracts GL F19627-88-K-0034 and SC-0064-90-0002, respectively. Contribution number 5004. Division of Geological and Planetary Sciences.
Funding AgencyGrant Number
Air Force Geophysics LaboratoryF19627-88-K-0034
Mission Research CorporationSC-0064-90-0002
Subject Keywords:equation of state; granite; phase transitions
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Caltech Division of Geological and Planetary Sciences 5004
Issue or Number:2
Record Number:CaltechAUTHORS:20141028-091644578
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Official Citation:Sekine, T., Duffy, T. S., Rubin, A. M., Anderson, W. W. and Ahrens, T. J. (1995), Shock compression and isentropic release of granite. Geophysical Journal International, 120: 247–261. doi: 10.1111/j.1365-246X.1995.tb01817.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50913
Deposited On:28 Oct 2014 18:59
Last Modified:10 Nov 2021 19:02

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