Lee, Sung Keun and Park, Sun Young and Kim, Hyo-Im and Tschauner, Oliver and Asimow, Paul and Bai, Ligang and Xiao, Yuming and Chow, Paul (2012) Structure of shock compressed model basaltic glass: Insights from O K-edge X-ray Raman scattering and high-resolution ^(27)Al NMR spectroscopy. Geophysical Research Letters, 39 (5). Art. No. L05306 . ISSN 0094-8276 http://resolver.caltech.edu/CaltechAUTHORS:20120411-104758286
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The detailed atomic structures of shock compressed basaltic glasses are not well understood. Here, we explore the structures of shock compressed silicate glass with a diopside–anorthite eutectic composition (Di_(64)An_(36)), a common Fe-free model basaltic composition, using oxygen K-edge X-ray Raman scattering and high- resolution ^(27)Al solid-state NMR spectroscopy and report previously unknown details of shock-induced changes in the atomic configurations. A topologically driven densification of the Di_(64)An_(36) glass is indicated by the increase in oxygen K-edge energy for the glass upon shock compression. The first experimental evidence of the increase in the fraction of highly coordinated Al in shock compressed glass is found in the ^(27)Al NMR spectra. This unambiguous evidence of shock-induced changes in Al coordination environments provides atomistic insights into shock compression in basaltic glasses and allows us to microscopically constrain the magnitude of impact events or relevant processes involving natural basalts on Earth and planetary surfaces.
|Additional Information:||© 2012 by the American Geophysical Union. Received 9 January 2012; revised 3 February 2012; accepted 7 February 2012; published 3 March 2012. This work was supported by the National Research Foundation, Korea to S.K.L. (2007-000-20120) and through subcontract 675P of NNSA DE-FC88-01NV14049 to O.T.. HPCAT was supported by DOE-BES-Materials Science, DOE-NNSA, CDAC, NSF, DOD–TACOM, and the W.M. Keck Foundation. The Caltech shock wave lab is supported by NSF EAR-1119522. We thank two anonymous reviewers for constructive comments.|
|Subject Keywords:||NMR; basaltic glass; inelastic X-ray scattering; shock compressed glass|
|Official Citation:||Lee, S. K., S. Y. Park, H.-I. Kim, O. Tschauner, P. Asimow, L. Bai, Y. Xiao, and P. Chow (2012), Structure of shock compressed model basaltic glass: Insights from O K-edge X-ray Raman scattering and high-resolution 27Al NMR spectroscopy, Geophys. Res. Lett., 39, L05306, doi:10.1029/2012GL050861|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||11 Apr 2012 20:22|
|Last Modified:||26 Dec 2012 15:03|
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