Primitive material surviving in chondrites - Mineral grainsBesides chondrules and various kinds of polymineralic inclusion, carbonaceous chondrites commonly contain, embedded in their matrices, isolated grains of mafic silicates and metallic iron. Most of the silicate grains probably originated in chondrules, but some appear to predate chondrule formation and may have formed as individual grains in the solar nebula. If that was the case, their compositions suggest some departure from equilibrium condensation from a gas of solar composition. Metal-grain compositions are broadly suggestive of nebular formation but the exact nature of the conditions in which they were formed remains problematical.
Document ID
19890040138
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Steele, Ian M. (Chicago, University IL, United States)