Palynostratigraphic Investigation of the Ordovician Units in the Central and Eastern Taurides, Turkey: Taxonomy, Biostratigraphy, Paleobiogeography and Sequence Stratigraphic Interpretations

Date

2024-7-4

Author

Akyüz, Işıl

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The primary goal of this thesis is to establish a biostratigraphical framework for the Ordovician sedimentary sequences from the Central and the Eastern Taurides by using palynological data in terms of the acritarch and chitinozoan. Thirteen stratigraphic sections from the Seydişehir, Sort Tepe, Halit Yaylası, and Pusçu Tepe formations in the Eastern Taurides, as well as their counterparts in the Central Taurides, were measured. A total of 384 sample were collected and 322 samples were palynologically analyzed. Taxonomical identification of 129 palynomorph species (9 chitinozoans, 109 acritarchs, 4 spores, and 7 algal affinities) was documented in detail. Six biozones were determined in the studied sections from the early Floian to the Late Ordovician. These biozones are Coryphidium bohemicum Assemblage Zone, Acanthodiacrodium vavrdovae Taxon Range Zone, Siphonochitina formosa Taxon Range Zone, Aureotesta clathrata var. simplex Assemblage Zone, Pterospermella colbathii Assemblage Zone, Villosacapsula setosapellicula Taxon Range Biozone in ascending order. Paleogeographically important assemblages such as Arbusculidinium filamentosum, Coryphidium, vi Vavrdovella, Arkonia, Striatotheca, galeate and diacromoph acritarch taxa which are admitted as the most characterized cold-water and peri- Gondwana assemblages, were recorded in the samples. These findings confirm that the location of the Central and Eastern Taurides was in the peri-Gondwana paleo-province during the Early–Middle Ordovician. Based on field observations, palynological implications, and microfacies of the clastic deposits, the depositional environments of the measured successions were interpreted as follows: the Seydişehir Formation's offshore to nearshore transitional marine environment; the Sort Tepe Formation's offshore marine environment; the Halit Yaylası Formation's glaciomarine outwash plain; and the Pusçu Tepe Formation's deeper marine environment. In the Halevik-1, Halevik-2, and Halevik-3 sections, sequence stratigraphic approach was carried out. TSTs, HSTs were determined in these sections. In addition, cycles were determined throughout the sections to correlated with onlap curves of Haq and Shutter (2008). Curves reflect similarities to the general trend of the onlap curves and the eustatic sea-level curve of Haq and Shutter (2008) in the studied time interval (early Floian to Hirnantian).

Subject Keywords

Ordovician, Biostratigraphy, Paleobiogeography, Central and Eastern Taurides, Sequence Stratigraphy

URI

https://hdl.handle.net/11511/110442

Collections

Graduate School of Natural and Applied Sciences, Thesis