Writers : Ghasemi-Nejad,Ebrahim;Ashouri, Alireza; Vahidinia, Mohamad; davtalab, Elham
Refference : The first international applied geological congress; Department of geology Islamic azad university- Mashhad
Publishing Year : 2010

Abstract :

The Sarcheshmeh Formation is one of the lower Cretaceous Formations that located Kopet Dagh basin in NE Iran. Anjirbolagh section next to Mazdavand village was collected in order to determine oxygen variation during the course deposition of Sarcheshmeh formation then it was studied. In order to estimate the amount of oxygen in palaeonvironmental, statistical studies is worked on three main groups of palynological ingredient, as well as depositional rate is determined by some of the ecological factors, too. In this research, four main factors that they preserve organic matter were studied in order to estimate the amount of oxygen. With regard to non or very little appearance of brown palynomesral, lability factor is very low that indicated the condition was far from beach and environment had low oxygen. With regard to ratio of translate SOM to opaque SOM in samples that it always was more than one and confirm that the condition was low oxygen or non-oxygen during deposition. In majority samples ratio of translate SOM to marine palynomorphs is exceeded that indicate the condition was non-oxygen and the rate of deposition was low. In majority samples also low ratio opaque SOM to marine palynomorph show that the condition was low oxygen or nonoxygen.

Subject List : Oxygen fluctuations