Abstract
The present work discusses topics in the source regions for meteorites, their secondary processing, irradiation effects on meteorites, solar system chronology, the early solar system, the chemistry of chondrites and the early solar system, magnetic fields in the early solar system, the nature of chondrules, micrometeorites, inhomogeneity of the nebula, the survival of presolar material in meteorites, nucleosynthesis, and the relationship between extinct radionuclides and nucleocosmochronology. Attention is given to igneous activity in the early solar system, principles of radiometric aging, the cosmochemical classification of the elements, highly labile elements, the potential significance of pristine material, the astrophysical implications of presolar grains, boundary conditions for the origin of the solar system, and iodine-xenon dating.
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