BAZI TERRA ROSSA TOPRAKLARININ TOZ FRAKSİYONLARININ MİNERALOJİK TABİATI VE KİMYASAL TERKİBİ ÜZERİNE ARAŞTIRMALAR

The present communication records the results of mincralogical and chemical analyses of silt fraction (2-20 n) seperaled by the usual international method of mechanical analysis from terra-rossa soil profiles developed under the mediterranean climatic conditions on calcareous parent material. The physical, chemical properties of this soils and the chemical and miueralogical nature of their clav factions have already been published. These total chemical analisis and X-ray examination of silts have been carried out in Paris at "Centre Scientifique et Technique Outre-Mer. Bondy". The silt fractions (2-20 [i) from selected samples were examined mineralogieally by differentital thermal analysis and X-ray difractions. From the miueralogical point of view the silt separates consist mainly of quartz with v ariable amounts of clay minerals which occured as aggregates and silt-size intermediate products like chlorite, \\"\[\\ one exception (No. 140) quartz is the predominant mineral in silt fractions. A negligible quantity of talc is olso present in most of the silt separates, but talc was never identified in the colloidal fraction of the same soil sample. Furthermore, a small quantity of goethite olso contribute to the silts.