Morphology and chemistry of projectile residue in small experimental impact craters

Details Morphology and chemistry of projectile residue in small experimental impact craters Morphology and chemistry of projectile residue in small experimental impact craters

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14..353h&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

5

Geochemistry, Hypervelocity Impact, Hypervelocity Projectiles, Impact Melts, Meteorite Craters, Chemical Composition, Copper, Cosmochemistry, Electron Microscopy, Glass, Gold, Light Gas Guns, Meteoritic Composition, Vaporizing, Planets, Cratering, Impact Craters, Morphology, Chemistry, Experiments, Laboratory Studies, Procedure, Velocity, Electron Microscopy, Surface, Texture, Melts, Pressure, Shock Effects, Silicates, Major Elements, Sem, Alkalis, Volatiles, Chemistry, Composition, Photographs, Spallation,

Scientific paper

Small-scale impact craters (5-7 mm in diameter) were produced with a light gas gun in high purity Au and Cu targets using soda lime glass (SL) and man-made basalt glass (BG) as projectiles. Maximum impact velocity was 6.4 km/s resulting in peak pressures of approximately 120-150 GPa. Copious amounts of projectile melts are preserved as thin glass liners draping the entire crater cavity; some of this liner may be lost by spallation, however. SEM investigations reveal complex surface textures including multistage flow phenomena and distinct temporal deposition sequences of small droplets. Inasmuch as some of the melts were generated at peak pressures greater than 120 GPa, these glasses represent the most severely shocked silicates recovered from laboratory experiments to date. Major element analyses reveal partial loss of alkalis; Na2O loss of 10-15 percent is observed, while K2O loss may be as high as 30-50 percent. Although the observed volatile loss in these projectile melts is significant, it still remains uncertain whether target melts produced on planetary surfaces are severely fractionated by selective volatilization processes.

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