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Abstract
The deposits of Permian system in Kuh-e-Gahkum consist of 480 m clastic subdiffusion of Faraghan Formation and carbonates of Dalan Formation. In this section, the sediments of Faraghan Formation, which is gradationally overlain by Dalan formation, unconformably overlies Zakin Formation (Lower Carboniferous). In the upper part, Kangan Formation rests on the Permian deposits with an erosional and unconformable contact. Studying the microscopic thin sections led to the identification of 37 genera and 37 species of Foraminifera as well as 14 genera and 15 species of algae. According to the identified foraminifera in Faraghan and Dalan Formations, the age of the rock units in Permian system is assigned to Julfian-Asselian.
Highlights
Similar to other parts of Iran and its neighbors, Permian progradational sequences (Faraghan Formation and its equivalences) are deposited in Zagros structural-sedimentary zone after a long period of erosion resulting from various phases of Hercynian tectonic, and reach to the upper Permian marine deposits (Dalan formation and its equivalences).Given the above-mentioned erosion period, progradational subdiffusions have clastic origin and are mostly composed of sandstone in fluvial environments, in intermediate deltaic environments
According to the identified foraminifera in Faraghan and Dalan Formations, the age of the rock units in Permian system is assigned to Julfian-Asselian
Gahkum section encompasses the sedimentary sequences of Sarchahan, Zakin, Faraghan and Dalan Formations (Figure 3)
Summary
Similar to other parts of Iran and its neighbors, Permian progradational sequences (Faraghan Formation and its equivalences) are deposited in Zagros structural-sedimentary zone after a long period of erosion resulting from various phases of Hercynian tectonic, and reach to the upper Permian marine deposits (Dalan formation and its equivalences). The lower boundary of the sandstones of Faraghan Formation shows unconformity while its upper boundary with carbonates of Dalan Formation (Permian) is of gradational type. Gahkum section is mostly characterized by Upper Permian carbonate deposits, known as Dalan formation. This stratigraphic unit is deposited in various parts of Zagros sedimentary basin. To conduct a meticulous study on Permian system in Zagros zone, one of its outcrops in Kuh-e-Gahkum in northern Bandarabbas City was stratigraphically and paleontologically examined
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