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Temperatures of shock-induced shear instabilities and their relationship to fusion curves

Schmitt, Douglas R. and Ahrens, Thomas J. (1983) Temperatures of shock-induced shear instabilities and their relationship to fusion curves. Geophysical Research Letters, 10 (11). pp. 1077-1080. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20141031-133535637

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Abstract

New emission spectra for MgO and CaAl_2Si_2O_8 (glass) are observed from 430 to 820 nm. Taken with previous data, we suggest that transparent solids display three regimes of light emission upon shock compression to successively higher pressures: (1) characteristic radiation such as observed in MgO and previously in other minerals, (2) heterogeneous hot spot (greybody) radiation observed in CaAl_2Si_2O_8 and previously in all transparent solids undergoing shock-induced phase transformations, and (3) blackbody emission observed in the high pressure phase regime in NaCl, SiO_2, CaO, CaAl_2Si_2O_8, and Mg_2SiO_4. The onset of regime (2) may delineate the onset of shock-induced polymorphism whereas the onset of regime (3) delineates the Hugoniot pressure required to achieve local thermal equilibrium in the shocked solid. We also propose that the hot spot temperatures and corresponding shock pressures determined in regime (2) delineate points on the fusion curves of the high pressure phase.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/GL010i011p01077DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/GL010i011p01077/abstractPublisherArticle
Additional Information:Copyright 1983 by the American Geophysical Union. (Received May 16, 1983; accepted September 2, 1983.) Paper number 3L1562. We appreciate the help of M. Boslough, M. Vassiliou, E. Gelle, and M. Long, and discussion with E. Stolper, T. Vreeland, R. Schwarz (all of Caltech) and M. Brown (Texas A & M). Supported under NSF Grant NSF 81-16026 and NASA Contract NGL-05-002-105. Contribution 3904, Division of Geological and Planetary Sciences, California Institute of Technology.
Funders:
Funding AgencyGrant Number
NSF81-16026
NASANGL-05-002-105
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences3904
Issue or Number:11
Record Number:CaltechAUTHORS:20141031-133535637
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141031-133535637
Official Citation:Douglas R. Schmitt and Thomas J. Ahrens (1983), Temperatures of shock-induced shear instabilities and their relationship to fusion curves. Geophysical Research Letters, 10: 1077–1080. doi: 10.1029/GL010i011p01077
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51135
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:03 Nov 2014 16:23
Last Modified:03 Oct 2019 07:30

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