NEBULAR MATTER DIFFERENTIATION BY THE CON DENSATION

A mathematical model of successive nebular matter condensation in term s of quasi-thermodynamic approximation is presented. A model is based on the assumption on the chemical equilibrium of the gaseous phase exc lusive of previously condensed matter within the diffusion layer. Cond ensed particles not above a few micron size are predicted to be compri sed of monomineral zones. A formula of hydrogen partial pressure (in b ars) dependence of the initial nebular condensation temperature (K) is derived: T(cond)(P(H-2)) = 32.8 ln(P(H-2)) + 2008.5. Small partial ma ss components are concentrated at the surface of particles. Only a few species of rockforming minerals are formed in a process of condensati on. A great variety of meteoritic minerals are assumed to be formed as a result of postcondensation matter transformation. A possibility of condensed monomineral particle separation in nebular space is indicate d.