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Facies Analysis and Depositional Environment of Upper Permian Rocks in Darin Section, East-Central Iran

Open Journal of Geology 2017年第3期7卷 242-256页

作者： Bibi Haniyeh Emraninasab Mohammad Hossein Adabi Mahmood Reza Majidifard Nader Kohansal Ghadimvand Sohei Erfani Department of Geology Islamic Azad University North Tehran Branch Tehran Iran Department of Earth sciences Shahid Beheshti University Tehran Iran Research Institute for Earth Sciences Geology Survey of Iran Tehran Iran

Deposits of Permian rocks in Kalmard Block are recognized with Khan Group, showing various characteristics in different outcrops. This group is made up of three informal formations, namely Chili, Sartakht and hermez. Upper Permian deposits (hermez Formation) are composed chiefly of lateritic and carbonate rocks. This formation is composed of 65.5 m lateritic soils, lateritic sandstone, limestone, dolomite and dolomitic limestone in the Darin section. This formation unconformably overlies middle Permian siliciclastic and evaporite deposits (Sartakht Formation), where as it is depicted underlying an erosional unconformity above lateritic deposits of lower Triassic (Sorkh Shale Formation). According to lithologic and microscopic investigations, the deposits of hermez Formation can be divided into 1 siliciclastic petrofacies and 14 carbonate microfacies. Field observations, along with microscopic examinations, have resulted in identifying tidal flat, lagoon, shoal and open marine environments in the rocks of the studied formation. Vertical changes of microfacies and depth variation curve point to the high thickness of the microfacies of lagoon, tidal flat and shoal environments and low thickness of open marine microfacies. hermez Formation rocks in Darin section are deposited in a low-angle homoclinal ramp, mostly in the inner ramp, located in the southern Paleo-Tethys Ocean.

关键词： Upper Permian Kalmard Block hermez Formation Depositional Environment

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