¹Steven J. Jaret, ¹William R. Woerner, ¹Brian L. Phillips, ^2,3Lars Ehm¹Hanna Nekvasil, ^4,5Shawn P. Wright, ¹TimothyD.Glotch
¹Department of Geosciences, State University of New York at Stony Brook, Stony Brook, New York, USA,
²Mineral Physics Institute, State University of New York at Stony Brook, Stony Brook, New York, USA,
³Photon Sciences Directorate, Brookhaven National Laboratory, Upton, New York, USA,
⁴Department of Geosciences, Auburn University, Auburn, Alabama, USA,
⁵Planetary Science Institute, Tucson, Arizona, USA

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 differences—preservation of original preimpact igneous zoning, anisotropy at infrared wavelengths, X-ray anisotropy, and preservation of some intermediate range order—which are all consistent with a solid-state transformation from plagioclase to maskelynite.

Jaret SJ, Woerner WR, Phillips BL, Ehm L, Nekvasil H, Wright SP, Glotch TD (2015) Maskelynite formation via solid-state transformation: Evidence of infrared and X-ray anisotropy. Journal of Geophysical Research Planets (in Press)
Link to Article [DOI: 10.1002/2014JE004764]

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