Study of mineralogical characteristics in a toposequance of the Ragein region's siols in East Azerbaijan

Subject Areas : Agroecology Journal

Naser Nazari ¹

1 - Scientific board of Islamic Azad University – Miyaneh branch

Received: 2006-06-18 Accepted : 2006-07-12 Published : 2006-08-23

Keywords: Taxonomy, calcareous parent materials, clay mineralogy, physiography, Profile,

Abstract :

In this study, mineralogical characteristics of Rajain’s plain soils located in East Azerbaijan province affected by various topography as a soil forming factor under semiarid condition with calcareous parent materials has been studied. The studied area with 42000 ha is located in 35th km of southeastern of Mianeh. The average plain elevation is 1290 m above mean sea level and the mean annual precipitation and temperature are 305.4 mm and 12.9º C respectively. Three physiographic units including including plateaus, piedmont alluvial plains and river alluvial plains were identified. In each physiographical unit, nine profiles were selected as control. According to the comperhensive soil classification system, USDA and FAO system, soils were classified up to family level. Jackson, Kitric and Hope Methods have been used for clay separation from the soil samples. Also, Mahra and Jackson Method has been used for mortar removing in aggregates including carbonates and gypsum soluble salts. The X-ray curves provided by simens5000 X-ray diffractometer with Fe-filtered copper Ka radiation cupper in 1.524 Ao length wave. the mineralogy was determined by X-ray diffraction with a and. X-ray diffractograms of clay fraction of representative soils showed that similar minerals were present, but differed in relative abundance. The relatively high amount of chlorite reveals that the soils are in young stage of development.

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