Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1175s&link_type=abstract
Lunar and Planetary Science, volume 27, page 1175
Physics
Kinetics, Microstructures, Minerals: High-Pressure, Shock, Timescales
Scientific paper
High-pressure minerals in the Sixiangkou (L6) chondrite contain micro-structures that can be used to constrain the time scale of shock metamorphism. Crystallization of majorite-pyrope garnet and magnesiowustite from a silicate melt at high pressure and temperature required micrometer-scale diffusion at high pressure. Large polycrystalline ringwoodites and majorites, formed by solid-state transformations, show evidence of annealing and dislocation recovery. These diffusion-controlled processes are inconsistent with the micro-second time scales generally accepted for shock metamorphism of chondrites.
Chen Michelle
El Goresy Ahmed
Sharp Thomas G.
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