Facies analysis and depositional history of Mozduran formation in Saleh-Abad section, Kopet-dagh basin, NE Iran

This is 165 m thick Mozduran formation, as a carbonate and siliciclastic strata, in Saleh-Abad section, consists of carbonate, sandy lime and siliciclastic rocks. Mozduran Formation relates to (Oxfordian-Kimmeridgian) age,locates conformably on Kashafrud and beneath Shourijeh Formation. The purposes of this study are: 1.The study of vertical and lateral changes in litho strata units, 2. identification, detachment and naming microscopic facies based on thin section, 3.The explain ton of digenetic events based on petrography events, 4.The explanation sedimentation history with using lithofacies properties and presentation the sedimentation model. Based on petrographic studies of 50 thin sections and two facies collection have been recognized. The Limestone facies collection consists of bioclastic grainstone pessessy Milliolidae (facies A, a lagoonal environment), sandy ooid grainstone, Bioclactic ooid grainstone, ooid grainstone with bioclast (facies B, a barrier environment), and Terrigeneous facies collection which is mainly composed of chert arenite and sublitarenite (facies C, a tidal flat nvironment). According to lithofacies, Mozduran Formation depositional environment could be interpreted as a carbonate plat form.