GSINET | Geological Survey of Iran , North - East Territory

Writers : Ghavidel- syook,M.
Refference : Geosciences Scientific Quarterly Journal,No.:29-30,P.:54
Publishing Year : 1377

Abstract :
A thick clastic sequence is well-developed in Tang-e-Zakeen, Kuh-e-Faraghan, being situated approximately 80 Km north of Bandar Abbaa. The sequence is 340 m. thick and mainly consists of sandstone, siltstone, shale and subordinate dolomitic beds. So far, this clastic sequence has been called Faraghan Formation. This rock unit lacks maim, fauna and based on stratigraphic position, it was assigned to the Early Permian (Szabo & Kheradplr, 1978). SInce then, a detailed palynological study has been carned out on the Faraghan Formation by the author. These studies resulted Identification of numerous palynomorph taxa, including miospor. and aciitarch species. Th. known palynomorph taxa indicated that, a major part of Faraghan Formation belongs to the Devonlan Period, whil. th. rest Is Early Permian.
As a result, the National kanlan Stratigraphic Committee decided and agreed upon to divide the Faraghan Formation into two rock units, namely, the Zakeen Formation, embracing the Devonlan strata, and Faraghan Formation for the Early P.rmIan sequence in the Zagros Basin respectively.
The Zakeen Formation derives from the Zakeen Village which is located in the southern flank of Kuh-e-Faraghan, about 80 km north of� Bandar Abbas. The type section of Zakeen Formation attains a thickness of 285m. in Tang-e-Zakeen, Kuh-e-Faraghan, approximately 23 km from the Zakeen village. It disconformably rests on the Sarchahan Formation, while it too, disconformably overlain by the Faraghan Formation. A total of 100 samples from the Zakeen Formation were selected and treated in the palynological laboratory of the Exploration Division of National Iranian Oil Company.
63 palynomorph taxa were encountered from the Zakeen Formation. The known species were arranged in five local stratigraphic assemblage zones. Zones I and II occur in a thickness of 96 m. of the Zakeen Formation, in ascending order, suggesting the Early Devonian. Whereas Zones III and IV occur Within 156 m.interval of the Zakeen Formation, representing the Middle Devonian. Lastly, the zone V is represtend by 35.5m. of rock-interval indicating the Frasnian age. The Zakeen Formation is not similar to any Devonian rock unit in the Alborz Ranges, as well as the Central Iranian Basin, but it is similar and equivalent to the Devonian rock units (Tawil, jauf and Jubah formations) of tha Saudi Arabia and southern Persian Gulf regions.
Subject List : Stratigraphy

Quarterly

Investigation on the Upper Paleozoic Strata in Tang - e - Zakeen, and Introducing Zakeen Formation, Kuh-e-Faraghan, Zagros Basin, South Iran