A presolar disk model is applied to describing the collapse of the protosolar nebula and the cosmochemical evolution of dust grains and trace vapors. The early solar region is modeled in terms of a viscous accretion disk exhibiting outward transport of angular momentum and mass transport toward the accreting protostellar center. Account is taken of the disk dimensions, the presence of turbulent motions, and the boundary conditions for trace components in the nebula. Estimates are made of the particle mass and density and vapor density distributions and the processes of large scale chemical fractionation. Vapor abundances are found to have cosmic values. Matter is repeatedly thermally recycled and dust particle enhancement is fostered by sublimation, turbulent transport and recondensation. Finally, a large deviation from cosmic chemical abundance ratios is predicted.
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Morfill et al. (1984) studied this question.