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    STUDIA GEOLOGIA - Issue no. 1 / 2000  
         
  Article:   DATE NOI PRIVIND COMPOZIŢIA MINERALOGICĂ A SILTULUI LUTITIC DE LA DUMBRAVA, JUDEŢUL CLUJ.

Authors:  LUCREŢIA GHERGARI, CORINA IONESCU, CRISTINA MARIŞ. 		 
       
         
  Abstract:  New Mineralogical Data on the Clayey Silt from Dumbrava (Cluj County). New mineralogical data on the lutitic silt occurrence from the Dumbrava (Cluj County, Romania), based on TEM and X-ray diffraction studies, are presented in the paper. Mainly kaolinite, and subordinately illite and illite/montmorillonite represent the mineralogical compounds of the clayey fraction of the rock. The lutitic silt represents a local facies, sedimented in subaquatic environments (a small lake or pool) after a short-distance transport from the sources. The source for the brown clays was probably a paleosoil formed nearby magmatic rocks. The source for the light coloured clays (creamy gray) was the alterated zone of metamorphic rocks.  
         
     
         
         
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