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Hugoniot equation of state of anorthite glass and lunar anorthosite

Boslough, Mark B. and Rigden, Sally M. and Ahrens, Thomas J. (1986) Hugoniot equation of state of anorthite glass and lunar anorthosite. Geophysical Journal of the Royal Astronomical Society, 84 (3). pp. 455-473. ISSN 0016-8009. doi:10.1111/j.1365-246X.1986.tb04366.x.

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Twenty-one Hugoniot experiments were conducted on an amorphous material of anorthite composition, in the pressure range 8–120 GPa, using both routine and new methods. Two Hugoniot measurements at about 120 GPa were made on lunar gabbroic anorthosite (Apollo 15, 418). Theoretical Hugoniots are constructed for both materials assuming they are disproportionate to their component oxides. These accurately predict the P-ρ behaviour of the lunar anorthosite Hugoniot at 120 GPa and the anorthite glass Hugoniot above 50 GPa, but overestimate the shock temperatures of anorthite glass. The mixed oxide model fails to predict the release paths of either material. We conclude that the mixed oxide model is a good description of the bulk properties of the high-pressure phases of anorthite, but does not represent the actual phases. A significant enrichment of calcic refractory material in the Earth's lower mantle is not precluded by the bulk properties of the anorthite high-pressure phases.

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Additional Information:Copyright © 1986 The Royal Astronomical Society. Accepted 1985 March 1. Received 1985 February 25; in original form 1984 March 4. We wish to thank E. Bus, E. Gelle, W. Ginn, M. Long and C. Manning for their excellent technical help, and J. Bass for informative discussions. Support was provided by NASA NGL 5-002-105 and NSG 0019. Several data are derived from shock-temperature measurements carried out at Lawrence Livermore National Laboratory. We are grateful to A. C. Mitchell and W. J. Nellis for the use of their light gas gun facility. Contribution 3997, Division of Geological and Planetary Sciences, California Institute of Technology.
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NASANGL 5-002-105
Subject Keywords:anorthite; anorthosite; compression; plagioclase; shock
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Caltech Division of Geological and Planetary Sciences3997
Issue or Number:3
Record Number:CaltechAUTHORS:20141030-120258959
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Official Citation:Mark B. Boslough, Sally M. Rigden, and Thomas J. Ahrens Hugoniot equation of state of anorthite glass and lunar anorthosite Geophys. J. Int. (1986) 84 (3): 455-473 doi:10.1111/j.1365-246X.1986.tb04366.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51068
Deposited By: George Porter
Deposited On:30 Oct 2014 19:49
Last Modified:10 Nov 2021 19:05

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