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Shock wave equation of state of muscovite

Sekine, Toshimori and Rubin, Allan M. and Ahrens, Thomas J. (1991) Shock wave equation of state of muscovite. Journal of Geophysical Research B, 96 (B12). pp. 19675-19680. ISSN 0148-0227. doi:10.1029/91JB02253.

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Shock wave data to provide an equation of state of muscovite (initial density: 2.835 g/cm^3) were determined up to a pressure of 141 GPa. The shock velocity (Us) versus particle velocity (Up) data are fit with a single linear relationship: U_s=4.62(±0.12) +1.27(±0.04)U_p (km/s). Third-order Birch-Murnaghan equation of state parameters (isentropic bulk modulus and isentropic pressure derivative of bulk modulus) are K_(os)=52±4GPa and K'_(os)=3.2±0.3. The pressure-temperature relation along the Hugoniot suggests that muscovite may dehydrate to KAlSi_3O_8 (hollandite), corundum, and water, with a small volume change, above 80 GPa. Thermodynamic calculations of the equilibrium pressure for the dehydration yields a significantly lower value. Observed unloading paths from shock pressures up to about 80 GPa are steeper in a density-pressure plane than the Hugoniot and become shallower with increasing shock pressure above that pressure. The changing slope may indicate that devolatilization occurs during unloading above 80 GPa. The present equation of state data for muscovite are compared with results of previously reported recovery experiments.

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Additional Information:Copyright 1991 by the American Geophysical Union. (Received February 20, 1991; revised August 5, 1991; accepted August 28, 1991.) Paper number 91JB02253. We thank Carl Francis of Harvard University for selecting the sample material. We are grateful to Michael Long and Epaprodito Gelle for experimental assistance. We thank R. Jeanloz and D. Walker for helpful reviews. This research was supported under AFGL F19628-88-K-0034, NSF, and NASA. Contribution 4983, Division of Geological and Planetary Sciences, California Institute of Technology.
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Air Force Geophysics LaboratoryF19628-88-K-0034
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Caltech Division of Geological and Planetary Sciences4983
Issue or Number:B12
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50820
Deposited By: George Porter
Deposited On:27 Oct 2014 03:10
Last Modified:10 Nov 2021 19:01

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