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Dynamic compression of enstatite

Ahrens, Thomas J. and Gaffney, Edward S. (1971) Dynamic compression of enstatite. Journal of Geophysical Research, 76 (23). pp. 5504-5513. ISSN 0148-0227. doi:10.1029/JB076i023p05504.

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New shock wave data for Bamle enstatite (Mg_(0.86),Fe_(0.14))SiO_3 in the range from 60–480 kb indicate a Hugoniot elastic limit of 67±10 kb and a possible phase-transition-produced shock front of 135±10 kb amplitude. Above the latter shock pressure, states in a mixed-phase regime are achieved up to ∼350 kb, above which the Hugoniot states are believed to represent the equation of state of a shock-induced phase, probably having the majorite (garnet) structure with a zero-pressure density of ∼3.67 g/cm^3. The present data, representing the high-pressure phase, agree closely with those of R. G. McQueen, S. P. Marsh, and J. N. Fritz above 610 kb for a Stillwater bronzitite of similar mineralogy. It is suggested that the formation of majorite from enstatite in naturally impacted rocks and meteorites requires dynamic pressures of at least ∼135 kb.

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Additional Information:Copyright 1971 by the American Geophysical Union. (Received January 7, 1971; revised Mach 18, 1971.) The research was supported by the National Science Foundation under GA-12703 and the National Aeronautics and Space Administration under NGL05-002-105. We appreciate the invaluable technical support of John L. Lower and David Johnson, the assistance of Rex V. Gibbons, Arden L. Albee, Earl K. Graham, and Arthur Chodos in analyzing our specimen, and G. J. Wasserburg and Leon Thomsen for critical comments. We also thank Friedrich Horz and his colleagues at the Lunar Science Institute for their hospitality and the opportunity to present this work to a critical audience. The publication was, in part, supported by NASA contract 09-051-001. Contribution 1956, Division of Geological and Planetary Sciences, California Institute of Technology. Lunar Science Institute Contribution 57.
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Subject Keywords:Deformation: Experimental Studies; Mineralogy: Equations Of State; Minerals: "Chain Silicates, Pyroxene Group "
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Caltech Division of Geological and Planetary Sciences1956
Lunar Science Institute57
Issue or Number:23
Record Number:CaltechAUTHORS:20141107-083037852
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Official Citation:Ahrens, T. J., and E. S. Gaffney (1971), Dynamic compression of enstatite, J. Geophys. Res., 76(23), 5504–5513, doi:10.1029/JB076i023p05504.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51414
Deposited By: George Porter
Deposited On:07 Nov 2014 17:45
Last Modified:10 Nov 2021 19:10

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