Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..137b&link_type=abstract
Lunar and Planetary Science, volume 27, page 137
Computer Science
Coconino Sandstone, Impacts, Metamorphism: Shock, Quartz, Spectroscopy: Nuclear Magnetic Resonance
Scientific paper
To quantify the extent of shock modification associated with the impact of projectiles into quartz targets, we used the NASA Ames Vertical Gun Range (AVGR) to generate impact craters and applied nuclear magnetic resonance (NMR) spectroscopy to recovered samples. Two cratering experiments were performed by using the two-stage gun to launch copper projectiles into target materials comprised of unconsolidated quartz powder and a block of Coconino Sandstone. The velocities of the 0.32 cm-diameter spherical impactors were 4.61 km/sec for the unconsolidated quartz and 4.97 km/sec for the sandstone block. The resulting impact craters have diameters of approximately 22 cm and 9 cm, respectively, for the quartz sand and solid sandstone targets. 29Si NMR spectroscopy of recovered target material from each impact experiment provides a useful method for comparing samples and degree of shock loading. The 29Si MAS (magic angle spinning) NMR spectra from samples collected across most of the crater in the quartz powder target exhibit relatively little variation in the quartz resonance. However, the shocked quartz collected from the central part of the crater exhibits extreme broadening of the NMR peak, indicating significant shock metamorphism. The samples from the impact crater formed in the sandstone block are characterized by broadened NMR peaks; the most significant broadening occurs for the material from the center of the crater and from the crater edge.
Boslough Mark B.
Crawford David Allen
Cygan Randall T.
James Kirkpatrick R.
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