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Structure of shock compressed model basaltic glass: Insights from O K‐edge X‐ray Raman scattering and high‐resolution 27 Al NMR spectroscopy
Author(s) -
Lee Sung Keun,
Park Sun Young,
Kim HyoIm,
Tschauner Oliver,
Asimow Paul,
Bai Ligang,
Xiao Yuming,
Chow Paul
Publication year - 2012
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2012gl050861
Subject(s) - raman spectroscopy , materials science , basalt , silicate , shock (circulatory) , spectroscopy , mineralogy , eutectic system , anorthite , chemical physics , analytical chemistry (journal) , geology , chemistry , physics , optics , microstructure , composite material , geochemistry , medicine , organic chemistry , quantum mechanics , chromatography
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.