Upper paleocene-lowermost eocene planktonic foraminiferal biostratigraphy and record of the paleocene-eocene thermal maximum in the Haymana Basin (Ankara, Turkey)

Tanık, Gamze
A rapid global warming event, called the Paleocene-Eocene Thermal Maximum (PETM), took place ca. 56 Ma, marking the Paleocene/Eocene boundary. This event is recorded by a turnover of planktonic foraminifera in deep marine settings, with occurrence of three species so-called planktonic foraminifera excursion taxa (PFET). This work was carried out in order to determine the record of this event in the Haymana Basin, Central Anatolia. The Haymana Basin provides a continuous sedimentary succession starting with Upper Cretaceous up to middle Eocene, where upper Paleocene-lower Eocene succession is represented by a deep marine shale succession, known as the Eskipolatlı Formation. A 33 meter thick stratigraphic section was measured from this formation, and 41 samples were taken. The samples were prepared by standard washing method, and planktonic foraminifera were picked from >63 and >106 μm fractions, and analyzed. Planktonic foraminifera were studied for biostratigraphic framework, 40 species belonging to 11 genera were identified, and 4 biozones were distinguished spanning through the late Thanetian and earliest Ypresian. In ascending order these biozones are as follows: Globanomalina pseudomenardii Zone, Morozovella subbotinae Zone, Acarinina sibaiyaensis Zone, and Pseudohastigerina wilcoxensis Zone. A quantitative study was conducted on 26 of the samples in order to establish the generic relative abundance changes throughout the measured section. As is in similar latitudes, the section withholds a dominance of Acarinina, accompanied by Subbotina and Morozovella genera. A smaller fraction of the assemblage is represented by Globanomalinids and Igorinids. A reworking/transportation problem is identified in the samples, causing difficulties determining the zonal boundaries. This situation, along with the quantitative results, can be interpreted to be related to the phases of turbiditic activity. With this study one representative of PFET, hence the chronostratigraphically short A. sibaiyaensis Zone was detected in the Haymana Basin, Turkey, for the first time. The PFET, apart from Acarinina sibaiyaensis, were not discovered, which may be due to large sampling interval, preservational complexities, or their preferred geographical distribution. Through the identification of A. sibaiyaensis Zone, position of the PETM is designated. With planktonic foraminiferal biozonation, chronostratigraphic position of the Eskipolatlı Formation is better visualized. 


Upper Paleocene-Lowermost Eocene Planktonic Foraminiferal Biostratigraphy and Record of the Paleocene-Eocene Thermal Maximum in the Haymana Basin (Ankara, Turkey)
Tanık, Gamze; Altıner, Sevinç (null; 2018-04-13)
The Paleocene-Eocene Thermal Maximum, the global warming event affected the oceans and lands of the globe, has long been recognized around the world. The biotic response to the warming was found to be differing among different taxa; a short-ranged assemblage was prominent for the warming period in planktonic foraminifera, called planktonic foraminifera excursion taxa (PFET). This study, conducted in the Haymana Basin, aims to investigate the record of the PETM in Central Anatolia in terms of planktonic ...
Planktonic foraminiferal biostratigraphy and microfacies analysis of the cenomanian-campanian succession in the Haymana-Polatlı Basin (Ankara, Turkey)
Sarıaslan, Nisan; Altıner, Sevinç; Department of Geological Engineering (2017)
In order to establish the planktonic foraminiferal biostratigraphy of the Cenomanian- Campanian deposits in the Haymana-Polatlı Basin, a stratigraphic section of 93.5 meters was measured and 75 samples were collected. The stratigraphic section starts with limestones containing late Cenomanian rotaliporid and dicarinellid species and continues with early-middle Turonian aged clayey limestones with sporadic shale beds. These units are overlain by red colored Santonian limestones and shales containing abundant...
Upper Cretaceous planktonic foraminiferal biostratigraphy from NW Turkey calibration of the stratigraphic ranges of larger benthonic foraminifera
Altıner, Sevinç (1999-01-01)
Planktonic and larger benthonic foraminifers of the Upper Cretaceous (Santonian-Maastrichtian)-Lower Tertiary (Danian) rock units from north, northwest and central Anatolian fore-are basins have been investigated in order to improve the biostratigraphic resolution of this time interval. Total abundance and diversity of planktonic foraminifers vary from rare (the sequence from the Haymana region) to high (the sequences from the Cide, Caycuma, Hanonu and Yenikonak regions) and preservation is poor to moderate...
Planktonic foraminiferal diversity and abundance changes across cretaceous-paleogene boundary beds in the Haymana basin and new observations on the extinction horizon
Karabeyoğlu, Ali Uygar; Altıner, Sevinç; Altıner, Demir; Department of Geological Engineering (2017)
Abundance and diversity patterns in planktonic foraminifera are important for paleoenvironmental and paleoclimatic interpretations before and after the CretaceousPaleogene mass extinction. A 14,53 m thick section was measured crossing the boundary between the Haymana Formation and the Yeşilyurt Formation in the northern part of the Haymana Basin. In the last 3.75 meters of the Maastrichtian below the K-Pg boundary, a series of quantitative analyses were carried out on planktonic foraminifera found above 63 ...
Late Cretaceous-Eocene Geological Evolution of the Pontides Based on New Stratigraphic and Palaeontologic Data Between the Black Sea Coast and Bursa (NW Turkey)
Ozcan, Zahide; Okay, Aral; Özcan, Ercan; Hakyemez, Aynur; Altıner, Sevinç (2012-01-01)
The Late Cretaceous-Eocene geological evolution of northwest Turkey between the Black Sea and Bursa was studied through detailed biostratigraphic characterization of eleven stratigraphic sections. The Upper Cretaceous sequence in the region starts with a major marine transgression and lies unconformably on a basement of Palaeozoic and Triassic rocks in the north (Istanbul-type basement) and on metamorphic rocks and Jurassic sedimentary rocks in the south (Sakarya-type basement). Four megasequences have been...
Citation Formats
G. Tanık, “Upper paleocene-lowermost eocene planktonic foraminiferal biostratigraphy and record of the paleocene-eocene thermal maximum in the Haymana Basin (Ankara, Turkey),” M.S. - Master of Science, Middle East Technical University, 2017.