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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.

studia universitatis babeș-bolyai. geologia/studia universitatis babeş-bolyai. geologia

Date noi privind compozitia mineralogica a siltului lutitic de la Dumbrava, judetul Cluj (New Mineralogical Data on the Clayey Silt from Dumbrava (Cluj County)