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Maskelynite formation via solid‐state transformation: Evidence of infrared and X‐ray anisotropy
Author(s) -
Jaret Steven J.,
Woerner William R.,
Phillips Brian L.,
Ehm Lars,
Nekvasil Hanna,
Wright Shawn P.,
Glotch Timothy D.
Publication year - 2015
Publication title -
journal of geophysical research: planets
Language(s) - English
Resource type - Journals
eISSN - 2169-9100
pISSN - 2169-9097
DOI - 10.1002/2014je004764
Subject(s) - plagioclase , infrared , fourier transform infrared spectroscopy , infrared spectroscopy , mineralogy , geology , materials science , chemistry , quartz , optics , physics , organic chemistry , paleontology
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.