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Heterogeneous shock-induced thermal radiation in minerals

Kondo, Ken-ichi and Ahrens, Thomas J. (1983) Heterogeneous shock-induced thermal radiation in minerals. Physics and Chemistry of Minerals, 9 (3-4). pp. 173-181. ISSN 0342-1791. doi:10.1007/BF00308375.

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A 500 channel optical imaging intensifying and spectral digital recording system is used to record the shock-induced radiation emitted from 406 to 821 nm from transparent minerals during the time interval that a shock wave propagates through the sample. Initial results obtained for single crystals of gypsum, calcite and halite in the 30 to 40 GPa (300 to 400 kbar) pressure range demonstrate greybody emission spectra corresponding to temperatures in the 3,000 to 4,000 K range and emissivities ranging from 0.003 to 0.02. In the case of gypsum and calcite, distinctive line spectra, are superimposed on the thermal radiation. The observed color temperatures are a factor of 2 to 10 greater than the Hugoniot temperature, calculable on the basis of continuum thermodynamics and equation of state models for the shock states achieved in the three minerals. These observed high temperatures are believed to be real. We conclude that we are detecting a large number of closed spaced high temperature shear-band regions immediately behind the shock front. A shear instability model, such as proposed independently by Grady (1977, 1980), Ananin et al. (1974), and Horie (1980), in which small zones of highly deforming and melted material are produced which are the source of the detected thermal radiation and have a fractional effective area approximately numerically equal to the measured emissivity, can be used to predict an effective emissivity of 0.0065 directly behind the shock front. If shear band instability arises from viscous flow processes, Grady's model and mineral thermal properties yield for the shocked mineral viscosities values in the range of 10^9 to 10^(15) P immediately behind the shock front.

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Additional Information:© 1983 Springer. Received October 1, 1981. We appreciate the interest and help of A. Sawaoka of Tokyo Institute of Technology, and W. Ginn, E. Gelle, M. Long, C. Manning, J. Vizgirda, and M. Boslough of Caltech. The paper has benefitted from the helpful comments of M. Brown (Texas A&M) and an anonymous reviewer. Research was supported by NASA, Grant No. NGL-05-002-105. Contribution No. 3686, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.
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Caltech Division of Geological and Planetary Sciences3686
Issue or Number:3-4
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51093
Deposited By: George Porter
Deposited On:31 Oct 2014 14:16
Last Modified:10 Nov 2021 19:05

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