Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ansb.rept.....c&link_type=abstract
Unknown
Physics
Meteorite Craters, Nuclear Magnetic Resonance, Phase Transformations, Sandstones, Shock Loads, Silicon Dioxide, Amorphous Materials, Coesite, Hypervelocity Impact, Shock Tests, Spectroscopy, Stishovite
Scientific paper
The shock-loading of natural materials by an impact, such as a comet or meteorite, can result in the formation of modified and altered phases in the target rock. In order to characterize the resulting material and to evaluate the extent of shock modification, the authors have used nuclear magnetic resonance (NMR) spectroscopy to examine several natural and experimentally shocked minerals. NMR spectroscopy is used to characterize the formation of high pressure silica polymorphs and amorphous material associated with the shocked Coconino Sandstone from Meteor Crater, Arizona. Five samples of the sandstone were obtained from several locations at the crater to represent a range of shock conditions associated with the hypervelocity impact of a 30 meter-diameter meteorite. The NMR spectra for these powdered materials exhibit peaks assigned to quartz, coesite, stishovite, and glass. A new resonance, identified as a densified form of amorphous silica with silicon in tetrahedra with one hydroxyl group, is observed for two of the moderately shocked samples. Experimental shock-loading of dry and water-saturated Coconino Sandstone powders provides shock-metamorphosed material that exhibit broadening of NMR resonances with increasing shock pressure, but no evidence of the new dense silica phase.
Boslough Mark B.
Cygan Randall T.
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