Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Carbonate microfacies and sedimentary environment of the Sarvak Formation in Khuzestan and Lorestan region

Document Type : Original Research Paper

Authors
Yaghoub Lasemi 1
Ali Hossein Jalilian 2
1 Department of Geology, Faculty of Sciences, Teacher Training University, Tehran, Iran
2 Department of Geology, Payam-Nour University, Ahvaz, Iran
Abstract
The Upper Cretaceous (Albian-Turonian) Sarvak Formation is a thick carbonate succession (over 800m) deposited in the southern margin of the Neotethys Ocean. Two stratigraphic sections, one in Khuzestan (Type-Section) and another in Lorestan was studied to determine its facies and paleoenvironments. Facies analysis and petrographic studies led to recognition of 12 microfacies of the open marine, shoal/barrier, shelf lagoon and tidal flat subenvironments. Vertical facies associations indicate that, the Sarvak Formation in the type section consists of two major 3rd order cycles and several small-scale cycles (parasequences). Lateral facies changes from shallow marine Sarvak Formation to deep marine Garau Formation (Neocomian- Coniacian) and the absence of clastics in the Lorestan area indicates the presence of an isolated platform to the northwest of the type section area. A rimmed shelf platform is suggested for the depositional environment of the Sarvak Formation with a slope dipping to the northwest.
Keywords
microfacies, Sarvak Formation, Khuzestan

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 7, 25-26
Autumn & Winter 1998, vol. 7, No. 25-26
Winter 1998
Pages 48-59

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6-Lasemi.pdf