Writers : Khosravi Elghar,Ghasemi Nejad,Ebrahim
Refference : 10th Symposium of Geological Society of Iran-Tehran
Publishing Year : 1385

Abstract :

A thick sequence of Mesozoic and Tertiary rocks have been deposited in Kopet-Dagh basin which covers an area of 55000 km2 in northeast Iran, southern Turkamanistan and north of Afghanistan.
Sanganeh Formation is one of the Lower Cretaceous formations in this basin. In this study palynology of a section containing Sanganeh Formation in east of Kopet-Dagh at Ghaleh-no section was studied in order to interpret the depositional environment. The section is 186 m thick and consists of dark grey shale with siltstone interbeds. Palynological contents of 45 collected samples were studied statistically and the mian palynological groups were calculated. Based on them three palynofacies were distinguished.
Based on these, depositional environment of the Sanganeh Formation was concluded as proximal shelf to mud-oxic shelf with subareobic and low energy conditions that deposited shale with high organic matter contents. Periodic sea level changes lead to anoxic basin environment in some periods.

Subject List : Biofacies