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HIGH TRIOCTAHEDRAL VERMICULITE CONTENT IN THE SAND, SILT, AND CLAY FRACTIONS OF A GRAY BROWN PODZOLIC SOIL IN GREECE

Morphological, chemical, and mineralogical properties of a Gray Brown Podzolic soil, derived from granite in Greece, are presented and discussed. Certain analytical data concerning this soil, namely the CEC and clay content, are incompatible, and this incompatibility could not, for some time, be explained. Thus, the clay content and the CEC of the B22t, B3, and C horizons were 20.8, 11.0, and 5.4 percent and 47.7, 50.5, and 47.8 me/100 g of soil, respectively, while the organic matter content was lower than 1 percent. This incompatibility has been explained and the observed high CEC values accounted for with accuracy, when it was found that not only the clay but also the coarse fractions of this soil contained high CEC material, namely a trioctahedral vermiculite and montmorillonite, the latter being present in small quantities only. The trioctahedral vermiculite was found in percentages ranging from 2.7 to 28.8 in the sand and 10.4 to 29.6 in the silt, and dominated the clay fraction (26.6 to 31.3 percent).