A Preliminary note on depositional characteristics and optical luminescence age of a marine terrace, strait of Canakkale, Turkey

This preliminary study investigated the depositional features and optical luminescence age of marine terrace sediments located on the east coast of the Strait of Canakkale, Turkey. With regard to depositional setting, the studied sequence is formed mostly of shallow marine deposits rich in quartz and oysters as well as other accessory minerals and various fossil sea shells. In vertical section, the sequence is characterized by two different stratigraphic units, i.e. a 1.50-m-thick sandy to gravely bottom unit (unit A) and an overlying 2.5-m-thick fossiliferous zone (unit B). On the basis of optically stimulated luminescence (OSL) age estimations obtained from six sampling levels from bottom to top, we determined superimposed cycles of deposition during interglacials from 246.47 +/- 25.32 ka (unit A) at MIS 7 to 127.48 +/- 8.91 ka (unit B) at MIS 5.Publisher's Versio

Karadeniz Güneybatı şelfinin holosen sedimentlerindeki bentik fauna toplulukları

Bu çalışmada Karadeniz GB şelf alanından alınan sediment karotlarının bentik fauna içerikleri (bentik foraiminifer, mollusc ve ostracod) incelenmiştir. Karotlar boyunca bentik faunanın bolluk ve tür çeşitliliğindeki değişimlerine bağlı olarak 3 farklı bentik topluluk ayırtlanmıştır. Bu topluluklar BF1, BF2 ve BF3 olup, Yeni Öksin dönemin bitişinden günümüze kadar dip suyundaki değişimleri yansıtmaktadır. Kanal-Çevresi’nden alınan karotlarda BF1 yüksek popülasyon ve tür çeşitliliği göstermekte, ancak şelf sedimentlerine doğru her ikisi de azalmaktadır. Orta-Şelf ve Dış-Şelf’te BF1 düşük popülasyon ve fakir bir tür çeşitliliğine sahiptir. Bu topluluk tuzlu Akdeniz alt suyunun Kanal çevresinde baskın olduğunu ve şelfe doğru uzaklaştıkça etkisinin azaldığını yansıtmaktadır ve yaklaşık 6 bin yıl önce çökelmeye başlamıştır. Dış-Şelf’te gözlenen foraminiferal faunadaki değişim, günümüzden yaklaşık 4 bin yıl önce dip suyunun nispeten düşük tuzluluğa doğru değişmesi ile alakalı olabilir. BF2 karışık bir fauna (acısı ve denizel Akdeniz türleri) içermekte ve Akdeniz suyunun yaklaşık 8 bin yıldan daha önceki girişi ile oluşan geçiş koşullarını yansıtmaktadır. BF3 ise Karadeniz’in Yeni Öksin’deki göl safhasına karşılık gelmektedir.Benthic faunal content (benthic foraminifera, mollusca and ostracoda) of sediment cores from the SW Black Sea shelf were examined. Based on the vertical distribution of abundance and diversity of the benthic fauna, three benthic assemblages were distinguished. These assemblages are BF1, BF2 and BF3, and reflect the changes in bottom water from the termination of the Neoeuxinian period to present. BF1 displays high abundance and diversity in the surroundings of the Bosporus channel, diminishing in the shelf sediments further away from the channel. In the Mid-Shelf and Outer Shelf, it displays low abundance and low diversity. BF1 which started to be deposited at about 6 ky BP reflects the source effect of the saline Mediterranean lower layer, diminishing in strength toward more distal areas. In the Outer Shelf, changing foraminiferal faunal content may suggest that relatively low salinity conditions in the bottom water were established after ~4 ky BP. BF2 consists of a mixed fauna (brackish and euryhaline Mediterranean species), suggesting transitional conditions with intrusion of Mediterranean water earlier than ~8 ky BP. BF3 corresponds to the Neoeuxinian lake phase of the Black Sea

Distribution of microflora, meiofauna, and macrofauna assemblages in the hypersaline environment of Northeastern Aegean Sea Coasts

WOS: 000321162100013In this study, the morphology and taxonomy of microflora (charophytes and diatoms), meiofauna (benthic foraminifera and ostracoda), and macrofauna (mollusk) assemblages of the recent surface sediments from saltpans, hypersaline lagoons, and salt lakes of the Gulf of Saros (NW Turkey) were investigated. In total, 44 samples were collected from recent surface sediments in salt pans, hypersaline lagoons, and salt lakes of the Gulf of Saros (Enez Salt Lake, Isik Lake, Kuvalak Lake, Enez Gala Lake, Dalyan Lake, and Tasalti Lake; Karagol, Vakif, and Erikli salt pans; and Uzungol Lagoon), Gallipoli Peninsula (salt pan), Biga Peninsula (Diremin and Azmak Lagoons and Dalyan Salt Lake), and Gokceada Island (salt lake). Surface sediments were collected, and some physical properties were measured, such as temperature, pH, and salt content. Grain size was determined and classified for each sample. In this study, foraminifera, ostracoda, and mollusca faunas in the normal marine environment were used as indicators and compared with the lagoonal environment, which has increased salt content during the summer months.Istanbul University [BAP-179/15012004]This research has been supported by the Research Fund of Istanbul University (Project: BAP-179/15012004). The authors wish to thank Ozkan Camurcu (Istanbul University), Mustafa Sunnetci (president of the municipality of Enez, 2004), Durmus Kaplan (Canakkale Province Environment and Forestry Directorate), and Metin Guvercin (The Chieftaincy of Forest Management in Gokceada) for their assistance during sampling

The aspects of the Late Quaternary (Holocene) setting belong to the eastern Gulf of Izmit, Adapazari, the delta of Sakarya and their environments ̇Izmit Körfezi'nin doǧusu, Adapazari, Sakarya Deltasi ve çevreleri Geç Kuvaterner (Holosen) çökellerinin özellikleri

This study is carried out on the settings of Holocene at eastern Gulf of ̇Izmit, Adapazari, Sakarya Delta and its vicinity, and based on 86 samples collected from the boreholes. The pollen diagram, based on the data from the boreholes drilled at Adapazari and its vicinity, suggested that high herbaceous pollen percentages of particularly Chenopodiaceae and Compositae, and Pinus and Quercus were present during the Early Holocene (approximately 11.300 BP years). Absent of the foraminifers in deltaik environment indicates that there was no any sea effect on the delta. In addition, the Gulf of Izmit, which was connected to Sakarya River in the Middle Pleistocene, moved to west. Moreover, when the elevations of the boreholes and different numerical ages (11.000-3.780 BP years) assigned at different depths are considered, it can be concluded that the region was under the control of tectonic activities in the forms of subsidence and uplift