Size and density sorting of metal and silicate grains under microgravity conditions and the origin of chondrites

Details Size and density sorting of metal and silicate grains under microgravity conditions and the origin of chondrites Size and density sorting of metal and silicate grains under microgravity conditions and the origin of chondrites

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30nssc7f&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 14, pp. SSC 7-1, CiteID 1780, DOI 10.1029/2003GL017659

Physics

1

Mineralogy And Petrology: Meteorites, Planetology: Comets And Small Bodies: Origin And Evolution, Planetology: Comets And Small Bodies: Physics And Chemistry Of Materials, Planetology: Comets And Small Bodies: Gravitational Fields, Planetology: Solar System Objects: Asteroids And Meteoroids

Scientific paper

We report here experiments on NASA's KC-135 microgravity facility aimed at investigating metal-silicate fractionation in chondrites. Metal and sand particle mixtures, with sizes and relative proportions approximating chondritic values, were allowed to undergo density and aerodynamic sorting as air was passed through 310, ten-centimeter long 2.54 cm diameter columns under microgravity conditions. Metal and silicate fractionation was found to occur when gases passed through the mixtures and when the particle diameter ratio was large (~3.0), with sand being enriched near the surface of the beds. This is contrary to experiments performed under terrestrial gravity and the semi-empirical Ergun equation. While the reason for this discrepancy is not well understood, the present results do suggest that separation of metal and silicates will readily occur under microgravity conditions on the surface of asteroids.

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