Volatility, Chondrules, and the Composition of the Earth

Details Volatility, Chondrules, and the Composition of the Earth Volatility, Chondrules, and the Composition of the Earth

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..531h&link_type=abstract

Lunar and Planetary Science, volume 27, page 531

Physics

Chondrules, Earth, Mantle, Volatility

Scientific paper

Despite success in modelling the gravitational accretion of planetesimals into planets, understanding the prior step in which micron-sized dust is accumulated into aggregates and incorporated into planetesimals has been problematical. Dust grains form fluffy fractal aggregates whose density remains low as they grow, so they are coupled to the turbulent gas and unable to settle to the disk midplane where planetesimal formation might then follow. Transformation of aggregates into dense chondrules by melting changes their aerodynamic properties dramatically. Turbulence calculations show that chondrules could have been concentrated into stagnant zones between eddies, and km-size concentrations could have fallen to the midplane so that the accretion process could proceed.

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