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Shock temperature measurements in Mg_2SiO_4 and SiO_2 at high pressures

Lyzenga, Gregory A. and Ahrens, Thomas J. (1980) Shock temperature measurements in Mg_2SiO_4 and SiO_2 at high pressures. Geophysical Research Letters, 7 (2). pp. 141-144. ISSN 0094-8276. doi:10.1029/GL007i002p00141.

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Temperatures in the high pressure shock state have been determined by measurement of optical radiation from pure samples of forsterite (Mg_2SiO_4), α-quartz, and fused silica. Shock waves of known amplitude were produced by tantalum flyer impact using a two-stage light gas gun. Shock pressures in the ranges 150-175 GPa and 70-115 GPa for Mg_2SiO_4 and SiO_2 respectively were achieved, and temperatures in the range 4500-6800 K were measured. The observed temperatures in Mg_2SiO_4 are consistent with the occurrence of a shock-induced phase transition with a transition energy of ∼ 1.5 MJ/kg. Measured Hugoniot temperatures versus pressure in both fused and crystalline SiO_2 shocked to the stishovite regime suggest the occurrence of a previously unknown transition, beginning at pressures of approximately 107 GPa and 70 GPa for α-quartz and fused quartz, respectively. The energies and temperatures appear to be consistent with the onset of melting of stishovite under shock loading.

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Alternate Title:Shock temperature measurements in Mg2SiO4 and SiO2 at high pressures
Additional Information:Copyright 1980 by the American Geophysical Union. (Received October 9, 1979; accepted November 19, 1979.) Paper number 9L1568. Supported under NSF Grant EAR 7812942 and the Department of Energy. The use of the Lawrence Livermore Laboratory light gas gun and electronics facilities are appreciated as is the help and encouragement of A. C. Mitchell, J. W. Shaner and W. J. Nellis. We appreciate the assistance of E. Gelle, J. Long and R. Smith of Caltech and D. Bakker, H. Martinez and W. C. Wallace of LLL. Many useful comments and suggestions on the manuscript and interpretations were provided by R. Jeanloz of Harvard University. Contribution No. 3332, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125. *Supported by the Fannie and John Hertz Foundation
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NSFEAR 7812942
Department of Energy (DOE)UNSPECIFIED
Fannie and John Hertz FoundationUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences3332
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Official Citation:(1980), Shock temperature measurements in Mg2SiO4 and SiO2 at high pressures. Geophysical Research Letters, 7: 141–144. doi: 10.1029/GL007i002p00141
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51539
Deposited By: George Porter
Deposited On:11 Nov 2014 16:01
Last Modified:10 Nov 2021 19:12

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