THE SOLAR CHONDRITE AS THE PRODUCT OF POS TCONDENSATION EVOLUTION OF NEBULA MATTER

Nonequilibrium unisothermal fractional condensation of nebular gas is considered in terms of mathematical modeling. The gas equilibrium is a ssumed only at the condensed particle surface. Such particle (r approx imately 2mum) is predicted to have a zonal structure corresponding to the nonequilibrium character of the condensation process. The final co ndencation product is stable in wide P-T interval and presumably could be considered as corresponidng to the average chemical composition of terrestrial planets. The equilibrium mineral assemblage of the conden sate we notate as ''solar chondrite'' comprised of Ol, Px, FlSp, Fe0.9 2Ni0.08, troilite, chromite, tephroite and carbon.