N. HONARJOO1AND A. JALALIAN2

1- Assistant Professor of Soil Science Department, Islamic Azad University, Khorasgan Branch, Isfahan, Iran.

2- Professor of Soil Science Department, Islamic Azad University, Khorasgan Branch, Isfahan, Iran.

 Received:12 May. 2007

Accepted:11 Oct. 2007 ABSTRACT Lands of Islamic Azad University of Khorasgan on piedmont plains of Baghe Rezvan mount were studied. These lands are representative of the area with much salt, gypsum and lime and surveying them is useful for the area. Morphologically, alternation in texture, structure, gravel contents, color, gypsum and lime contents are representative of lithologic discontinuity in the soils. With the respect to the fact all soils are derived from the Baghe Rezvan mountains, and have the same parent materials, these alterations are attributed to different floods, erosions and deposition that are products of change in climate in time. In the limestone, sandstone, conglomera and shale's of lithologic formation of Baghe Rezvan mount there are illite, kaolinite, chlorite, feldspars and quartz. All of these minerals were found in the soils. Besides these there were vermiculite-chlorite, paligorskite and in difractograms. Presence of dryness with lime and gypsum were prepared genesis and coexistence of palygorskite. Micro morphological studies showed that there were much coarse lime gravels and little fine materials. In thin sections some dense non continuous and nonsense non continuous gypsum infillings were seen. Presence of alternative layers of lime and clay as hypocoatings and quasicoatings on lime gravels show that there were changes in weathering in some periods. There were quartz, cert., epidot. amphibole, pyroxene, feldspars, primary chlorite and calcite, and some fragments of fossil lime-stones from cretaceous and siltstones in thin sections too.