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Maskelynite formation via solid-state transformation: Evidence of infrared and X-ray anisotropy


Jaret, Steven J.
Woerner, William R.
Phillips, Brian L.
Ehm, Lars
Nekvasil, Hanna
Wright, Shawn P.
Glotch, Timothy D.


We present the results of a combined study of shocked labradorite from the Lonar crater, India, using optical microscopy, micro-Raman spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, high-energy X-ray total scattering experiments, and micro-Fourier transform infrared (micro-FTIR) spectroscopy. We show that maskelynite of shock class 2 is structurally more similar to fused glass than to crystalline plagioclase. However, there are slight but significant differencespreservation of original preimpact igneous zoning, anisotropy at infrared wavelengths, X-ray anisotropy, and preservation of some intermediate range orderwhich are all consistent with a solid-state transformation from plagioclase to maskelynite.