Selective Oxidation/Reduction and Impact Melting in Experimental Metal-Silicate Craters

Details Selective Oxidation/Reduction and Impact Melting in Experimental Metal-Silicate Craters Selective Oxidation/Reduction and Impact Melting in Experimental Metal-Silicate Craters

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1109r&link_type=abstract

Lunar and Planetary Science, volume 27, page 1109

Physics

1

Craters: Impact, Melts: Impact, Metamorphism: Shock

Scientific paper

We have produced thin veneers of crystalline to frothy projectile residues (where the projectiles varied from dunite, diopside, orthoclase or basalt cylinders) within small cm-sized craters formed in metal targets (where the targets varied from 1100 Al, Cu, SS304 or Mo). The morphology and mixing of the silicate residue with metal spherules is similar to that described in many natural impact melts including lunar samples, terrestrial impact crater melts and tektites, and shock features in some meteorites. Textural and chemical analysis suggests that local regions of these residues experienced high temperature gradients, fast rates of nucleation and crystal growth and minimal, but selective oxidation/reduction. Such inferences should help decipher the heterogeneous evolution of impact melts in terrestrial and extraterrestrial samples.

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