GENERAL FEATURES OF FINE-GRAINED MATERIAL OF PRIMITIVE CHONDRITES
Keywords:
primitive chondrites, fine-grained material, chondrules, xenoliths.Abstract
Chemical and mineralogical features of fine-grained material in primitive chondrites are de-scribed. According to mineralogical and chemical composition, three groups of fine-grained ma-terial have been distinguished: sulphide-rich, metal-rich and silicate. Sulphide-rich and metal-rich ones have been detected inside the fine-grained xenoliths, the silicate – in the rims of xeno-liths and chondrules. It has been determined that a silicate fine-grained material, unlike fine-grained material enriched with sulphides and/or metal, was formed in a dust medium depleted by refractory components.
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