Foraminiferal biostratigraphy of the Middle Permian-Lower Triassic shallow marine carbonate successions of the Bolkar Dağı Unit (Central Taurides, Turkey)

Date

2025-2

Author

Esatoğlu Vekli, Aysel Hande

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In this study, the paleontological, biostratigraphical, and microfacies characteristics of the Middle Permian-Lower Triassic shallow marine carbonate successions of the allochthonous Bolkar Dağı Unit in the Hadim region (Central Taurides) were investigated. For this purpose, seven stratigraphic sections were measured through the Permian Taşkent Formation and the Triassic Ekinlik Formation which is composed mainly of limestone and siltstone. Based on careful paleontological analysis, a detailed benthic foraminiferal taxonomy was presented, and the biostratigraphic framework of the Middle Permian-Lower Triassic successions was determined. Based on the taxonomic studies, the distribution charts of the sections were presented, and eleven biozones were defined. The Permian-Triassic boundary was placed between the Palaeofusulina cf. sinensis-“Nodosaria” expolita Assemblage Biozone, and the Postcladella kalhori Interval Biozone in the Yumak Tepe Section, the Reichelina changsingensis-Paradagmarita monodi Assemblage Biozone and the Postcladella kalhori Interval Biozone in the Bolat Section and finally between the Palaeofusulina cf. sinensis- Reichelina changsingensis Assemblage Biozone, and the Postcladella kalhori Interval Biozone in the Eğricegüney Section, based on the first occurrences of the Triassic marker Postcladella kalhori. Based on detailed taxonomical studies, 52 genera, 80 species of foraminifera, and four genera of algae, were identified. On the other hand, a detailed microfacies analysis was carried out to determine the depositional environment of the studied successions. Consequently, 16 main and 18 subtypes of microfacies were distinguished. Based on the distribution of the determined microfacies types, the composite depositional environment model was presented.

Subject Keywords

Permian-Triassic, Foraminifera, Biostratigraphy, Microfacies, Central Taurides

URI

https://hdl.handle.net/11511/114090

Collections

Graduate School of Natural and Applied Sciences, Thesis