In 1 his experiment for SI udyi ng and co mparing of clay
m i nera Il. in t he sol is uf river terraces, fou r profi les se lec teu and
),:unpICtl a, reprc.'>enlcd profiles for mineralogical analysis. Three
profile..; were on th ree terraces of Zayanuehrood river in Pole -
ShllhrCSlan Ihal caen of them has different ages, and the forth is
loca ted un the o ld rive r alluvial pla in and is o lde r th an three
terraces. So il samples were prepared according to the proposed
method I'ly Killric and Hope. X - ray technique was used 10
determine Ihe minerals present in the rine and coarse clay
fr the pre),cm:e of Ollart:r, Kll nlin i tc, IlI i1t~, r hl ori rc ;end :1 l ill ie.
POlygorskitc in all soils. In the soil of hi gher terrace there is
Smel.:ti lc and in the old plain's so ils the Smectit e and
Pnlygorskitc arc dominant. This co nfirms the idea that Smeclite
procc.~s.