Mathematics – Logic
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..375a&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 375-376 (SEE N92-10728 01-91)
Mathematics
Logic
Abundance, Chemical Fractionation, Geochemistry, Impact Melts, Meteorite Craters, Meteorites, Projectiles, Silicates, Australia, Geological Surveys, Geomorphology, Hypervelocity Impact, Lunar Rocks, Solubility, Vaporizing, Volatility
Scientific paper
The abundance pattern of siderophile elements in terrestrial and lunar impact melt rocks was used extensively to infer the nature of the impacting projectiles. An implicit assumption made is that the siderophile abundance ratios of the projectiles are approximately preserved during mixing of the projectile constituents with the impact melts. As this mixture occurs during flow of strongly shocked materials at high temperatures, however there are grounds for suspecting that the underlying assumption is not always valid. In particular, fractionation of the melted and partly vaporized material of the projectile might be expected because of differences in volatility, solubility in silicate melts, and other characteristics of the constituent elements. Impactites from craters with associated meteorites offer special opportunities to test the assumptions on which projectile identifications are based and to study chemical fractionation that occurred during the impact process.
Attrep Jr. A.
Orth Carl J.
Quintana Leonard R.
Shoemaker Carolyn S.
Shoemaker Eugene M.
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