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Sedimentary petrology and depositional environments of the Lower Permian (Dorud Formation) clastic rocks in the Alborz region

The Lower Permian rocks of the Alborz region (Jolfa, Abyeik, Bibi Shahrbanu, Amol, Mighan and Ghaznavi) were studied to define their facies and depositional environments. The Lower Permian rocks of the Alborz area are composed of thick clastic (conglomerate, sandstone, siltstone and shales) and carbonate (limetstone) facies. In some places (Amol) about 365 meters of sediments have been deposited during Asselian to Sakmarian time. The Lower Permian rocks of the Alborz region are characterized by the clastic sediments of the Oorud Formation. Facies analysis of more than 100 thin sections and 15 polished samples led to the recognition of several clastic facies. The clastic rocks of the Dorud Formation (units 1 and 3) were deposited in a continental (meandering river) and transitional (deltaic and beach) environments.