[en] The simultaneous evolution of weak and nuclear reactions along with baryon diffusion in isothermal fluctuations produced in the quark-hadron phase transition is discussed. We find that the resulting light-element nucleosynthesis is sensitive to the separation distance between fluctuations, although still consistent with observed light-element abundances (except possibly ⁷Li) for a reasonable range of separations between fluctuations. The heavy-element nucleosynthesis has been computed for all nuclei up to A = 28. It appears that an r-process ''seed'' abundance will be formed with a mass fraction of 10/sup /minus/12/ to 10/sup /minus/10/. It is not yet clear whether this will lead to an overproduction of r-process abundances relative to that observed in metal-poor halo stars. The evolution of the fluctuations after nucleosynthesis is discussed and it is concluded that these fluctuations are not likely to collapse to form compact cold-dark-matter remnants, but are probably smoothed by baryon diffusion before recombination. 17 refs., 3 figs