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

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DOI: 10.4236/ojg.2017.73017    784 Downloads   909 Views  

ABSTRACT

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.

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Emraninasab, B. , Adabi, M. , Majidifard, M. , Ghadimvand, N. and Erfani, S. (2017) Facies Analysis and Depositional Environment of Upper Permian Rocks in Darin Section, East-Central Iran. Open Journal of Geology, 7, 242-256. doi: 10.4236/ojg.2017.73017.

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