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Shock-Induced Transformations in the System NaAISiO_4 -SiO_2 : a new Interpretation

Sekine, Toshimori and Ahrens, Thomas J. (1992) Shock-Induced Transformations in the System NaAISiO_4 -SiO_2 : a new Interpretation. Physics and Chemistry of Minerals, 18 (6). pp. 359-364. ISSN 0342-1791. doi:10.1007/BF00199416.

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New internally consistent interpretations of the phases represented by the high pressure phase shock wave data for an albite-rich rock, Jadeite, and nepheline in the system NaAlSiO_4-SiO_2, are obtained using the results of static high pressure investigations, and the recent discovery of the hollandite phase in a shocked meteorite. We conclude that nepheline transforms directly to the calcium ferrite structure, whereas albite transforms possibly to the hollandite structure. Shock Hugoniots for the other plagioclase and alkali feldspars also indicate that these transform to hollandite structures. The pressure-volume data at high pressure could alternatively represent the compression of an amorphous phase. Moreover, the shock Hugoniot data are expected to reflect the properties of the melt above shock stresses of 60–80 GPa. The third order Birch-Murnaghan equation of state parameters are: K_(os) = 275±38 GPa and K′_(os) = 1.6±1.5 for the calcium ferrite type NaAlSiO_4, K_(os) = 186±33 GPA and K′_(os) = 2.6±1.7 for the albite-rich hollandite, K_(os) = 236±45 GPa and K′_(os) = 2.3±2.0 for the orthoclase-rich hollandite, and K_(os) = 190 to 210 GPa and K′_(os) ≈ 2.2 for the anorthite-rich hollandite.

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Alternate Title:Shock-Induced Transformations in the System NaAISiO4 -SiO2 : a new Interpretation
Additional Information:© 1992 Springer-Verlag. Received January 21. 1991; accepted August 16, 1991. We thank H. Mori for hi data on hollandite and T.S. Duffy in calculating the bulk moduli of the high-pressure phases and for his careful reading the early manuscript. We thank the two reviewers and the editor for helpful comments. This research was supported under AFGL F 19628-88-K-0034. NSF. and NASA. Contribution number 4977. Division of Geological and Planetary Science, California Institute of Technology. Pasadena, CA 91125.
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Air Force Geophysics LaboratoryF 19628-88-K-0034
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Caltech Division of Geological and Planetary Sciences4977
Issue or Number:6
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Official Citation:Sekine, T., & Ahrens, T. (1992). Shock-induced transformations in the system NaAlSiO4—SiO2: a new interpretation. Physics and Chemistry of Minerals, 18(6), 359-364. doi: 10.1007/bf00199416
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50991
Deposited On:29 Oct 2014 16:55
Last Modified:10 Nov 2021 19:04

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