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

Subject Areas :

Hamidreza Azami ¹ , Mehdi Reza Poor Soltani ² , Mohsen Allameh ³

1 - دانش آموخته کارشناس ارشد رسوب شناسی و سنگ شناسی رسوبی، دانشگاه آزاد اسلامی، واحد شاهرود
2 - استادیار گروه زمین شناسی، دانشگاه آزاد اسلامی، واحد مشهد
3 - استادیار گروه زمین شناسی، دانشگاه آزاد اسلامی، واحد مشهد

Received: 2016-09-07 Accepted : 2016-09-07 Published : 2012-06-21

Keywords: Depositional environment, Mozduran Formation, Jurassic, Saleh-Abad,

Abstract :

This is 165 m thick Mozduran formation, as a carbonate and siliciclastic strata, in Saleh-Abad section, consistsof 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 studyof vertical and lateral changes in litho strata units, 2. identification, detachment and naming microscopic faciesbased on thin section, 3.The explain ton of digenetic events based on petrography events, 4.The explanationsedimentation history with using lithofacies properties and presentation the sedimentation model. Based onpetrographic studies of 50 thin sections and two facies collection have been recognized. The Limestone faciescollection consists of bioclastic grainstone pessessy Milliolidae (facies A, a lagoonal environment), sandy ooidgrainstone, Bioclactic ooid grainstone, ooid grainstone with bioclast (facies B, a barrier environment), andTerrigeneous facies collection which is mainly composed of chert arenite and sublitarenite (facies C, a tidal flatenvironment). According to lithofacies, Mozduran Formation depositional environment could be interpreted as acarbonate plat form.