Foraminiferal paleontology and sequence stratigraphy in the upper visean - serpukhovian deposits (Aladağ unit, Eastern Taurides, Turkey)

Demirel, Seda
The aim of this study is to investigate the Upper Visean substages, delineate the Visean - Serpukhovian boundary with calcareous foraminifera and interpret the foraminiferal evolution and sequence stratigraphical framework by using sedimentary cyclicity across the boundary section. For this purpose a 59,61 m thick stratigraphic section consisting of mainly limestone and partly sandstone and shale is measured in the Aziziye Gediği and Oruçoğlu Formations in the Pınarbaşı Region of Eastern Taurides. A detailed micropaleontological study has revealed presence of important foraminiferal groups namely, parathuramminids, earlandiids, endothyroids, archaediscids, biseriamminids, fusulinids, loeblichids, tournayellids and paleotextularids and 145 species and three biozones. The biozones are, in ascending order, Eostaffella ikensis – Vissarionovella tujmasensis Zone (Mikhailovsky; Late Visean), Endothyranopsis cf. sphaerica – Biseriella parva Zone (Venevsky; Late Visean) and Eostaffella pseudostruvei – Archaediscids @ tenuis stage Zone (Taurssk; Early Serpukhovian). A detailed microfacies analysis was carried out in order to understand the depositional history and sedimentary cyclicity and construct the sequence stratigraphic framework of the studied area. Three main depositional environments consisting of open marine, shoal or bank and tidal flat environments were interpreted based on the analysis of 12 major microfacies and 11 sub-microfacies types. Based on the vertical association of microfacies twenty-six cycles, two sequence boundaries and three sequences were recognized in the studied section and these two sequence boundaries, which correspond to the Mikhailovsky and Venevsky horizons, are the records of the global sea level changes during the Late Paleozoic Ice Age. Within this context Visean – Serpukhovian boundary falls in the transgressive system tract of the third sequence. The duration of cycles are calculated as 117 ky and interpreted as orbitally induced glacioeustatic cycles.


Foraminiferal and calpionellid biostratigraphy, microfacies analyses and tectonic implications of the upper jurassic – lower cretaceous carbonate platform to slope successions in sivrihisar region (Eskişehir, NW Turkey)
Atasoy, Serdar Görkem; Altıner, Demir; Department of Geological Engineering (2017)
This study focuses on the biostratigraphy, microfacies analyses and the tectonic interpretation of an Upper Jurassic – Lower Cretaceous carbonate succession widely exposed in a tectonic klippe of the Sakarya Zone (Pontides), north of Sivrihisar region (Eskişehir). For this purpose two stratigraphic sections were measured (925 m thick in total) along the carbonate rocks that crop out north of the Dümrek Village. According to the biozonation and the microfacies types, two coeval but dissimiliar depositional d...
Geoarchaelogical investigation of central anatolian caravanserais using gis
Ertepınar Kaymakcı, Pnar; Toprak, Vedat; Department of Geological Engineering (2005)
This study comprises analysis of geological, geomorphological constraints that played role in the site selection of caravanserais. In order to do this, 15 caravanserais located along a route from Nevşehir-Aksaray-Konya to Beyşehir were used. The data used in the study include a caravanserai database, lithological maps, and digital elevation model of the area. GIS analyses performed in the study are proximity, visibility, and probability distribution (PDA). The first step is the generation of the ancient tra...
Palaeomagnetic evolution of the Cankiri Basin (central Anatolia, Turkey): implications for oroclinal bending due to indentation
Kaymakcı, Nuretdin; Langereis, Cor; White, Stan; van Dijk, Paul (Cambridge University Press (CUP), 2003-05-01)
Palaeomagnetic data in combination with palaeostress data and anisotropy of magnetic susceptibility orientations are utilized to develop a tectonic evolutionary model for the Early Tertiary part of the Omega(omega)-shaped Cankiri Basin (Turkey). The results reveal clockwise rotations in the northeast and anticlockwise rotations in the west and southeastern corner of the basin. The magnetic inclinations indicate a northward drift of the Cankiri Basin and support an indentation model for the Kirsehir Block. I...
Taxonomy and biostratigraphy of calpionellids and saccocoma across the jurassic-cretaceous boundary beds of the alci block: alacaatli olistostromes, Ankara, Turkey
Akgümüş, Begüm; Altıner, Sevinç; Department of Geological Engineering (2019)
The main aim of this study is to determine the exact position of the Jurassic- Cretaceous (the Tithonian-Berriasian) boundary based on the calpionellid species and their biozones within the pelagic limestone block (Alcı Block). To achieve this aim, the stratigraphic section-BA was measured as 59,30 meters throughout the Alcı Block and totally 72 samples were collected for the preparation of the thin sections. Totally 3 zones and 5 subzones have been designated as Chitinoidella Zone (boneti Subzone), Crassic...
Altıner, Sevinç (Wiley, 1993-12-01)
Within the framework of an integrated stratigraphy, a detailed biostratigraphic study of Late Jurassic-Early Cretaceous (Tithonian-Valanginian) calcareous nannofossils was carried out in north-west Anatolia, Turkey.
Citation Formats
S. Demirel, “Foraminiferal paleontology and sequence stratigraphy in the upper visean - serpukhovian deposits (Aladağ unit, Eastern Taurides, Turkey),” M.S. - Master of Science, Middle East Technical University, 2012.