Planktonic foraminiferal biostratigraphy and microfacies analysis of the cenomanian-campanian succession in the Haymana-Polatlı Basin (Ankara, Turkey)

Sarıaslan, Nisan
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 globotruncanids. The stratigraphic section ends with monotonous grey colored silty shales of the Campanian, whose silt content increases more towards the upper part. vi At the end of detailed taxonomic studies performed on both the washed material and thin sections of the samples, the distributions of planktonic foraminifera throughout the stratigraphic section were determined. Based on these findings, a biostratigraphic framework including 9 biozones and 2 subzones was established. In ascending order, the Rotalipora cushmani Zone - Dicarinella algeriana Subzone, Whiteinella archaeocretacea Zone, Helvetoglobotruncana helvetica Zone, Dicarinella asymetrica Zone - Globotruncanita elevata-Dicarinella asymetrica concurrent range Subzone, Globotruncanita elevata Zone, Globotruncana ventricosa Zone, Globotruncanella spp. Zone, Globotruncana aegyptiaca Zone and Gansserina gansseri Zone were identified. Moreover, the evolution of depositional environment reflected by the changing microfacies types through the stratigraphic section was revealed. The microfacies identified from bottom to top were Planktonic Foraminiferal Packstone, Radiolarian Packstone, Packstone with Planktonic Foraminifera and Radiolaria, Radiolaria-bearing Spiculite Packstone, Planktonic Foraminiferal Wackestone, Wackestone with Planktonic Foraminifera and Radiolaria, Silty Wackestone-Mudstone with Planktonic Foraminifera and Wackestone-Mudstone. The inability to determine the zones representing the late Turonian-Coniacian as well as the observation of an unconformity between the pre-Santonian and Santonian deposits were interpreted as the existence of a hiatus covering this time period. 


Plankton biostratigraphy and magnetostratigraphy of the Santonian-Campanian boundary interval in the Mudurnu-Goynuk Basin, northwestern Turkey
Wolfgring, Erik; Wagreich, Michael; Dinares-Turell, Jaume; Yılmaz, İsmail Ömer; Bohm, Katharina (2018-07-01)
The Santonian-Campanian boundary interval close to the village of Goynuk in northwestern Turkey (Bolu province) was recorded and examined with respect to nannofossil and foraminiferal biostratigraphy, magnetic polarity and magnetic susceptibility. During the Late Cretaceous, the Mudurnu-Goynuk Basin was located on the Sakarya continent situated in the northwestern Tethyan Realm, north of the Neo-Tethys.
A large number of surficial sediment samples (75 grab samples, one boomerang core, four box cores) as well as primary productivity measurements have been used to estimate the rates of sediment accumulation in the Sea of Marmara; using an empirical expression for the relationship between surface productivity and organic carbon content of the sediment (MOLLER-SUESS formula). It was found that calculated low sedimentation rates occurred on the inner southern Marmara shelf (ave. 8 cm 1000 y-1) where the primary...
Seismic evidence of shallow gas in the sediment on the shelf off Trabzon, southeastern Black Sea
Okyar, M; Ediger, V (1999-04-01)
High-resolution seismic surveys carried out on the shelf off Trabzon (southeastern Black Sea) show that the sub-bottom stratigraphy consists of two main depositional sequences (A and B) one of which contains zones of acoustic turbidity. Of these, the upper depositional sequence (A) is thought to comprise Holocene sediments, while the lower depositional sequence (B) is interpreted as approximating to the Pleistocene. The boundary between these sequences is defined by a reflector (R), which is interpreted as ...
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; Department of Geological Engineering (2017)
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 ...
Planktonic foraminiferal biostratigraphy, sequence stratigraphy and foraminiferal response to sedimentary cyclicity in the upper cretaceous-paleocene of the Haymana basin (Central Anatolia, Turkey)
Amirov, Elnur; Altıner, Sevinç; Department of Geological Engineering (2008)
The aim of this study is to establish the planktonic foraminiferal biozonation, to construct the sequence stratigraphical framework and to determine the foraminiferal response to sedimentary cyclicity in the sedimentary sequence spanning Upper Cretaceous-Paleocene in the Haymana basin (Central Anatolia, Turkey). In order to achieve this study, the stratigraphic section was measured from sedimentary sequence of the Haymana, Beyobası and Yeşilyurt formations. The sedimentary sequence is mainly characterized b...
Citation Formats
N. Sarıaslan, “Planktonic foraminiferal biostratigraphy and microfacies analysis of the cenomanian-campanian succession in the Haymana-Polatlı Basin (Ankara, Turkey),” M.S. - Master of Science, Middle East Technical University, 2017.