بررسی تعیین اشکال ناهمواری ها، خصوصیات فیزیکی و شیمیایی و مینرالوژیک شنزارهای استان تهران - ابردژ

Wind is the most important factor of erosion in arid regions.Movment of soil by wind is a complex phenomenon that it is under some factors such as climatic and geomorphological conditions and so on. This research was done at three stages as identifing dunes forms, physical and chemical specifications ,and mineralogical specifications of Abardej sand dunes at south east of Tehran province.At first stage,different specifications of the sand dunes were studied such as dunes form,kind of sands granulation,form of sand gravels,mineralogy and so on.On based of the observations, the form of Abardej sand dunes is Barkhan that it is a reason for existing a dominant wind at one direction.The main minerals of sand dunes gravels are Quartz, Feldspat and Calcit.Based on morphoscopic studies,gravels of Abardej sand dunes have steep angels.This result says that Abardej sand dunes have a near source.The gravels sands are almost shiny and halo. This result shows that sand dunes come from river - beds.The mean of sand gravels is about 200 micro meter and about 20-25 percent of gravels have diameter about 250 micro meter or more.The result additionally shows that sand dunes have a local and near source. Key words: Sand Dune, Morphology, Physico-chemical, Mineralogical ,Tehran Abardej.