Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Biostratigraphy of the Gurpi Formation based on planktonic foraminifera in the Fars area, Zagros basin

Document Type : Original Research Paper

Authors
1 Department of Geology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
2 Department of Geology, Faculty of Basic Sciences, Bu-Ali Sina University, Hamedan, Iran
Abstract
In order to study the biostratigraphy of the Gurpi Formation in the Fars area, a stratigraphic section is selected and sampled in the Sarbalesh anticline. The thickness of the Gurpi Formation in this section is 346.3 meters and its main lithology includes argillaceous limestone and shale. The lower boundary with the Sarvak Formation indicates a disconformity with dissolution holes and iron oxide bearing fragments, and its upper boundary with the Pabdeh Formation indicates a disconformity with a 30 cm thick key horizon containing phosphate nodules and manganese oxide traces. In this study, by identifying 66 species belonging to 22 genera of planktonic foraminifera, 9 biozones were identified and introduced based on the Tethys standard biozonation of Premoli Silva and Verga (2004). The age of the Gurpi Formation based on identified biozones is determined from the early Santonian to the late Maastrichtian. The K/Pg boundary is located at the end of the key horizon containing phosphate nodules and correlates with the lithostratigraphic boundary of the Gurpi and Pabdeh formations.
Keywords

Subjects


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